Answer:
This can be understood by saying that two sodium atoms combine with one diatomic chlorine molecule to form two ionic units of sodium chloride. Another aspect of chemical reactions is the physical properties of compounds, or how atoms and molecules fit together.
Explanation:
Hope this helped you! Brainliest if possible!
I also answered first! (Please don't copy my answer for the people that are going to answer this question, thank you!) :D
3. A 3.4-kg fireworks rocket is launched vertically into the night sky with an initial speed of 44.2 m/s. The rocket explodes and breaks into two pieces 3.1 seconds later. The first piece has a mass of 2.1-kg and travels 22 m/s at 140 degrees from the point of explosion. (A) What is the mass of the second piece? (B) What is the velocity of the second piece after the explosion?
The total initial momentum of the rocket is 150.28 kg m/s. The total final momentum of the mass fractions is equal to the initial value. From this, the mass of the second piece is 1.3 kg with a velocity of 80 m/s.
What is momentum ?Momentum of an object is the product of its mass and velocity. During a collision, the total momentum will be conserved. Thus, total initial momentum of the system is equal to its total final momentum.
Here, mass of the rocket = 3.4 kg
velocity = 44.2 m/s
then momentum = 3.4 kg × 44.2 m/s = 150.28 kg m/s
The mass of one piece = 2.1 kg.
then mass of second piece of the rocket = 3.4 - 2.1 = 1.3 kg.
velocity of first piece = 22 m/s
then, momentum = 2.1 kg × 22 m/s = 46.2 kg m/s.
Now, momentum of first piece + momentum of second piece = 150.28 kg m/s.
then momentum of second piece = 150.28 - 46.2 = 104 kg m/s.
Therefore, velocity = momentum/mass
v = 104 kg m/s /1.3 kg = 80 m/s.
Therefore, the velocity of the second piece of the rocket after explosion is 80 m/s.
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When two objects are in contact with no relative motion, which of the following statements about the frictional force between them, is true? (FN is the normal force.)a. The frictional force is always equal to μknb. The frictional force is always less than μknc. The frictional force is determined by other forces on the objects so it can be either equal to or less than μkn.
The frictional force may have a magnitude that is equal to or less than sn.
What kind of motion occurs when two bodies do not move relative to one another?Static denotes being still. Static friction is the friction that exists between two surfaces that are in contact when there is no relative motion between them. It is a force that self-adjusts.
Static friction occurs when the two surfaces that are creating it are neither moving nor sliding in relation to one another.The frictional force that exists between surfaces while they are at rest in relation to one another is known as static friction. When a tiny amount of force is applied, the static force's magnitude is identical in the other direction.
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Now Jolon and Terry tackle a problem: A block of mass 2.0 kg is attached to a horizontal spring that has a force constant of 2.90 X 103 N/m, and is free to slide on a frictionless surface as shown: The spring is compressed to Xj -6.5 cm by pushing on the block, and then the block is released_ Find the work done by initially compressing the spring: Find the kinetic energy of the block when it reaches x = 0_ Find the speed of the block at x = 0. m/s
The speed of the block at x = 0 is 1.84 m/s.
What is kinetic energy?Kinetic energy is a type of energy that an object possesses due to its motion. It is defined as the energy that an object has by virtue of its motion, and is given by the equation:
K = (1/2)mv²
where K is the kinetic energy of the object, m is its mass, and v is its velocity.
We use the conservation of energy principle. Initially, the block has potential energy stored in the spring, which is converted into kinetic energy as the block moves towards its equilibrium position, where x=0.
The potential energy stored in the spring when it is compressed to x = -6.5 cm is given by:
U = (1/2)kx²
where k is the force constant of the spring and x is the displacement from its equilibrium position.
Substituting the given values, we get:
U = (1/2) (2.90 X 10³ N/m) (0.065 m)²
U = 6.73 J
Therefore, the work done by compressing the spring is 6.73 J.
At the equilibrium position, all the potential energy stored in the spring is converted into kinetic energy. So, kinetic energy of the block at x = 0 is equal to potential energy stored in spring at x = -6.5 cm.
Therefore, the kinetic energy of the block at x = 0 is also 6.73 J.
Speed of the block at x = 0:
The kinetic energy of the block at x = 0 is given by:
K = (1/2)mv²
where m is the mass of the block and v is its speed.
Substituting the given values, we get:
6.73 J = (1/2) (2.0 kg) v²
Solving for v, we get:
v = √((2 x 6.73 J) / 2.0 kg)
v = 1.84 m/s
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A 6.0-kg rock is dropped from a height of 9.0 m. At what height is the rock's kinetic energy twice its potential energy?
A rock weighing 1 kilogramme is thrown from a distance of six metres. height is the difference between the rock's kinetic and potential energy?
Describe energy?People have figured out how to transform energy from one type to another and use it to accomplish tasks, making modern civilization possible.
A possibility is what?In a wide range of disciplines, including physics and the social sciences, the phrase is used to denote objects that are capable of changing
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The toy store created a display of s shelves of remote control cars. Each shelf contains 16 cars. Choose the expression that shows how many cars are on the display.
"The expression that shows number of remote control cars on the display self is 16s."
In order to create a mathematical expression, you need at least two numbers, variables, one arithmetic procedure, and a statement. In order to determine the total number of items in all of the self, we must multiply the number of self (n) by the number of self (x).
On a display stand, 16 remote-control vehicles are present. There are s display racks in total.
Therefore, there will be 16 times as many vehicles overall as s.
16 vehicles are displayed.
As a result, the expression '16s' indicates that there are 16 cars on exhibit.
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9
17. Mary is 14 years old, weighs 125 pounds and is 5ft 6in tall. What is her
Basal Metabolic Rate? (Use the formula found in the "Nutrition &
Metabolism" worksheet. Round to the nearest whole calorie)
1326
O 1436
O 1568
O 2436
The basal metabolic rate for the girl of 14 years weighing 125 pounds and height of 5ft.6 inch is 1573 Kcal/day.
What is basal metabolic rate ?The basal metabolic rate of a person is the number of calories that is burned inside the body through basic life -sustaining metabolic functions. It can be calculated using the below equations for men and women.
BMR for men = 88.362 + (13.397 x weight in kg) + (4.799 x height in cm) – (5.677 x age in years)
BMR for women = 447.593 + (9.247 x weight in kg) + (3.098 x height in cm) – (4.330 x age in years).
Given, the age = 14 years
weight = 125 pounds = 56.7 kg
1 feet = 30.48 cm
1 inch = 2.54 cm.
then 5ft.6inch = 167.64 cm.
Now BMR = 447.593 + (9.247 x 56.7) + (3.098 x 167.64 ) – (4.330 x 14)
= 1573 Kcal/day.
Therefore, the basal metabolic rate of the girl is 1573 Kcal/day.
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If the normal force exerted on the rock as it slides through its lowest point (point b) is twice the weight of the rock, how much work did friction do on the rock as it moved from a to b?.
The work done by friction as the rock moves from point a to point b is equal in magnitude to the potential energy of the rock at point a, and it is negative because it acts in the opposite direction to the displacement of the rock
To determine how much work friction did on the rock as it moved from point a to point b, we need to first consider the forces acting on the rock and the work done by each force.
At point a, the rock has only potential energy due to its position above the ground. As it slides down the slope towards point b, the potential energy is converted to kinetic energy, and the rock gains speed.
The forces acting on the rock as it slides down the slope are:
The force of gravity acting downward, with a magnitude equal to the weight of the rock (mg).
The normal force acting perpendicular to the slope, which is equal in magnitude but opposite in direction to the force of gravity (2mg at point b).
The force of friction acting parallel to the slope, in the opposite direction to the motion of the rock.
Since the rock is sliding down the slope, the force of friction must be acting in the direction opposite to the motion, which means that the work done by friction is negative.
The work-energy principle states that the net work done on an object is equal to its change in kinetic energy. In this case, we can assume that the initial velocity of the rock at point a is zero, so its initial kinetic energy is also zero.
At point b, the rock has reached its maximum speed and all of its potential energy has been converted to kinetic energy. Therefore, the work done by gravity is equal to the change in potential energy:
[tex]mgh = (1/2)mv^2[/tex]
where m is the mass of the rock, g is the acceleration due to gravity, h is the vertical distance between points a and b, v is the speed of the rock at point b.
Solving for v, we get:
[tex]v = \sqrt{(2gh)}[/tex]
The work done by the normal force is zero, since it acts perpendicular to the displacement of the rock.
The work done by friction is given by:
[tex]W_{friction} = -f * d[/tex]
where f is the force of friction and d is the horizontal distance between points a and b.
To determine the force of friction, we can use the fact that it is equal in magnitude to the normal force multiplied by the coefficient of friction (μ):
f = μ * N
At point b, the normal force is twice the weight of the rock, so N = 2mg. The coefficient of friction is not given, so we cannot calculate the exact value of the work done by friction.
However, we can make some general observations about the work done by friction based on the information given. Since the normal force at point b is twice the weight of the rock, this implies that the slope is steeper at point b than it is at point a. This in turn implies that the force of friction at point b is greater than it is at point a. Therefore, we can conclude that the work done by friction is negative and that its magnitude is greater than zero.
Finally, we can use the work-energy principle to calculate the work done by friction:
[tex]W_{friction} = -mgh = -[(1/2)mv^2][/tex]
Substituting the expression we derived for v, we get:
[tex]W_{friction} = -mgh = -[(1/2)m(2gh)] = -mgh[/tex]
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A ball with mass m is suspended from a roof with a rope of length L. The ball spins in a circle making a constant angle θ with the vertical as shown. Write an expression for the speed v of the ball in terms of m, L, θ, and g.
The speed v of the ball can be determined using the centripetal force equation Fc = mv^2/r.
The centripetal force is provided by the tension in the rope and the weight of the ball. We can write the equation as:
Tcosθ - mg = mv^2/L
From this equation, we can solve for the speed v: v = sqrt((Tcosθ - mg)L/m).
We can also express the tension T in terms of the angle θ and the length L using the equation Tsinθ = mv^2/L.
Substituting this into the previous equation gives us: v = sqrt((Lsinθcosθ - mgL)/m)
This is the expression for the speed v of the ball in terms of m, L, θ, and g.
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kinetic energy of an object whose mass is 1Kg and it is moving at a velocity of 5m/s.
The kinetic energy of the object is: KE = 0.5 x 1 kg x (5 m/s)2
= 12.5 J
What is kinetic energy?Kinetic energy is the energy of motion. It is the energy an object has due to its motion. Kinetic energy can be defined as the energy an object has due to its mass and its velocity. Kinetic energy is measured in Joules (J). Kinetic energy increases with increasing mass and velocity of an object. When an object is at rest, it has zero kinetic energy. When an object is in motion, it has kinetic energy. Kinetic energy is a form of energy that is associated with the motion of an object. It is the energy that is stored in the movement of an object. Kinetic energy is one of the fundamental forms of energy, along with potential energy.
Kinetic energy is the energy possessed by an object due to its motion. It is a form of energy that can be calculated using the equation:
Kinetic energy (KE) = 0.5 x Mass (m) x Velocity (v)2
In this case, the mass of the object is 1 kg and its velocity is 5 m/s.
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which of the following structures is/are necessary to initiate the muscle action potential? select all that apply. view available hint(s)for part c which of the following structures is/are necessary to initiate the muscle action potential?select all that apply. tropomyosin troponin motor neuron myosin acetylcholine muscle fiber actin t-tubule ryanodine receptor calcium motor end plate ach receptor-channels ca2 -atpase submit
Answer:
muscle fiber, acetylcholine, ACh receptor-channels, motor neuron, motor end plate
Explanation:
Those are the ones that are necessary to initiate the muscle action.
fill in the blanks waves can travel through ____ .air granite rock molten magma water sandstone mudstone
Waves can travel through the air, granite rock, water, sandstone, and mudstone. Waves can also travel through molten magma, but only in certain conditions.
What is a wave?In physics, a wave is a disturbance that travels through space and time, usually accompanied by the transfer of energy. Waves can be characterized by their amplitude, wavelength, frequency, and speed.
Here,
Waves can travel through the air, granite rock, water, sandstone, and mudstone. Waves can also travel through molten magma, but only in certain conditions.
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A hippo is dozing under water with only its small nostrils sticking out. It has a mass of 1600 kg and a volume of about 1.57 m3 after exhaling. How much force does it exert on the ground of the pool (fresh water, density 1g/cm3)?
The concept Buoyant force is used here to determine the force which on the ground of the pool. The buoyant force is 15385.21 N.
What is Buoyant force?The Buoyant force is defined as the upward force exerted on an object which is fully or partially immersed in a liquid. This force is also called the Upthrust. Due to this force a body immersed in a fluid appears to lose its weight.
The Buoyant force is calculated as:
F = mg × ρ fluid / ρ hippo
Density of hippo = Mass/volume
= 1600/1.57 = 1019.10 kg/m³
Density of fluid = 1 g/cm³ = 1000 kg/m³
F = 1600 × 9.8 × 1000/1019.10 = 15385.21 N
Thus the Buoyant force is 15385.21 N.
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6. Find the total impulse of the following graph
The total impulse here is the sum of area of the rectangle and area of the triangle. Here, area of the rectangle is 18 Ns and area of the triangle is -2 Ns, then the total impulse is 16 N.s.
What is impulse ?
Impulse is a physical quantity which measures the change in momentum of the object. The change in momentum is equal to the product of force and time.
thus impulse = F t
From the graph, impulse = area of rectangle + area of triangle
area of rectangle = lb = 2 s × 6 N = 18 N s
area of triangle = 1/2 bh = 1/2 2 s × -2 N = - 2 N.s
Total impulse from the graph = -2 Ns + 18 Ns = 16 N.s.
Therefore, the total impulse of the object obtained from the graph is 16 N.s.
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A man pushes a lawn mower on a level lawn with a force of 207 N. If 41% of this force is directed forward, how much power does he expend in pushing the mower 4.8 m in 18 s?
The power which is required to push the mower on a level lawn with a force of 207 N will be 32.568 watts.
What is Power?Power can be defined as the rate of work done per unit of time taken to move or displace an object from one location to another location.
When considering work done on the object, we always take the force directed along the axis of motion, which is in this case, the horizontal axis. If 59% of the force is directed downward, then 41% of the force is being directed horizontally, so the horizontal force is
207 × 0.59 = 122.13N,
Work done = Force applied × displacement of the object
Work done = 122.13 × 4.8 = 586.22 Joules
Power = Work done/ Time taken
Power = 586.22/ 18
Power = 32.568 watts (W)
Therefore, the power will be 32.568 watts.
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In a 41 s interval, 580 hailstones strike a glass window of area 1.346 m2 at an angle 31◦ to the window surface. Each hailstone has a mass of 7 g and speed of 6.7 m/s. If the collisions are elastic, find the average force on the window. Answer in units of N.
Answer:
N = hailstones / sec = 580 / 41 = 14.1 stones / sec
mass = .007 kg
v = 6.7 m/s * sin 31 = 3.45 speed of stones perpendicular to surface
Δp = 2 m Δv change in momentum dur to striking window
F = N Δp force required to repel hailstones
F = 2 N m Δv = .68 N force on window pane
Pressure = force / area (don't need window area for force)
A 0.40-kg block initially at rest on a frictionless horizontal surface is acted upon by a force of 7.0 N for a distance of 3.5 m. How much kinetic energy does the block gain?
The kinetic energy taken by the block will be 24.5 J.
What is kinetic energy?An object's kinetic energy is the energy it has as a result of its motion. It is defined as the amount of work required to accelerate a body of a given mass from rest to a given velocity. The body retains its kinetic energy after gaining it during acceleration unless its speed changes.
Given that a 0.40-kg block initially at rest on a frictionless horizontal surface is acted upon by a force of 7.0 N for a distance of 3.5 m.
The kinetic energy will be calculated as:-
KE = F x D
KE = 7 x 3.5
KE = 24.5 J
Therefore, the block will get a kinetic energy of 24.5 J.
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The velocity v of a particle moving in the xy plane is given by =(6.0t−4.0t 2) i^ +8.0 j^ , with v in meters per second and t(>0) in seconds.(a) What is the acceleration when t=3.0s ?
(b) When (if ever) is the acceleration zero? (c) When (if ever) is the velocity zero? (d) When (if ever) does the speed equal 10m/s?
The given velocity of the particle moving in the xy plane is:
v = (6.0t - 4.0t^2) i^ + 8.0 j^
(a) To find the acceleration when t = 3.0s, we differentiate the velocity with respect to time:
a = dv/dt = (6.0 - 8.0t) i^
Substituting t = 3.0s, we get:
a = (6.0 - 8.0(3.0)) i^ = -18.0 i^
Therefore, the acceleration when t = 3.0s is -18.0 m/s^2 in the x-direction.
(b) To find when the acceleration is zero, we set the acceleration to zero and solve for t:
a = (6.0 - 8.0t) i^ = 0
Solving for t, we get:
t = 0.75 seconds
Therefore, the acceleration is zero when t = 0.75 seconds.
(c) To find when the velocity is zero, we set the velocity to zero and solve for t:
v = (6.0t - 4.0t^2) i^ + 8.0 j^ = 0
Solving for t, we get:
t = 0 seconds and t = 1.5 seconds
Therefore, the velocity is zero at t = 0 seconds and t = 1.5 seconds.
(d) To find when the speed equals 10 m/s, we first need to find the magnitude of the velocity:
|v| = sqrt((6.0t - 4.0t^2)^2 + 8.0^2)
Setting this equal to 10 m/s and solving for t, we get:
t = 0.981 seconds and t = 2.019 seconds
Therefore, the speed is equal to 10 m/s at t = 0.981 seconds and t = 2.019 seconds.
a passenger car traveling down a rough road bounces up and down at 1.1 hz with a maximum vertical acceleration of 0.24 m/s2 both typical values. What are the (a) amplitude and
(b) maximum speed of the oscillation?
The frequency of the oscillation. In this case, the amplitude is 0.218 m. and B. the maximum speed of the oscillation is 0.636 m/s.
What is frequency?Frequency is a measure of the number of occurrences of a repeating event per unit of time. It is also referred to as temporal frequency, which emphasizes the contrast to spatial frequency and angular frequency.
a) The amplitude of the oscillation is the maximum displacement of the car from its equilibrium position. It is equal to the maximum acceleration divided by the frequency of the oscillation. In this case, the amplitude is 0.24 m/s² / 1.1 hz = 0.218 m.
b) The maximum speed of the oscillation is related to the amplitude and frequency of the oscillation. It can be calculated using the formula v = √(2*a*f), where a is the maximum acceleration and f is the frequency of the oscillation. In this case, the maximum speed of the oscillation is v = √(2*0.24 m/s² * 1.1 hz) = 0.636 m/s.
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A flask contains 1313 mole of H2H2 and 2323 mole of HeHe. Compare the force on the wall per impact of H2H2 relative to that for HeHe.
Answer: The force exerted on the wall by He is twice than by H2.
Explanation: I believe this is the answer because:
Pressure is defined as the force per unit area.
It means that pressure is directly proportional to the force. If the pressure is increased, more force will be exerted on the walls of the container.
According to Henry’s law, the partial pressure of gas in the gas mixture is directly proportional to the mole fraction of the gas.
Among the given gas mixture, the mole fraction of He is twice more than that of H2. So, the pressure exerted by the He gas is two times greater than H2.
Hence, the force exerted on the wall will be greater by He than by H2.
The ratio of the impact of the gases is:
H2 over He = 1/3 over 2/3 - 1 : 2
Therefore, the force exerted on the wall by He is twice than by H2.
I hope this helps!
A hiker is at the bottom of a canyon facing the canyon wall closest to her. She is 280. 5 m from the wall and the sound of her voice travels at 340. 0 m/s at that location. How long after she shouts will she hear her echo.
The hiker will hear her echo 1.65 seconds after she shouts.
To determine how long it takes for the hiker to hear her echo, we need to calculate the time it takes for the sound to travel from the hiker to the canyon wall, reflect off the wall, and travel back to the hiker.
Let's start by calculating the time it takes for the sound to travel from the hiker to the canyon wall. We can use the formula:
Time = distance / speed
where distance is the distance between the hiker and the canyon wall, and speed is the speed of sound.
Plugging in the given values, we get:
Time = 280.5 m / 340.0 m/s = 0.825 s
So it takes 0.825 s for the sound to travel from the hiker to the canyon wall.
Now we need to calculate the time it takes for the sound to travel from the canyon wall back to the hiker. This time will be the same as the time it took for the sound to travel from the hiker to the canyon wall, since the distance is the same and the speed of sound is constant.
Therefore, the total time it takes for the hiker to hear her echo is:
total time = 2 x time = 2 x 0.825 s = 1.65 s
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Problem 7: A secret agent skis off a slope inclined at θ = 28 degrees below horizontal at a speed of v0 = 12.9 m/s. He must clear a gorge, and the slope on the other side of the gorge is h = 15.5 m below the edge of the upper slope. what is the maximum width
The maximum width of the gorge that the secret agent can clear is 33.2 m.
What is gorge?Gorge is a steep-sided valley that is typically formed when a river or stream cuts through a landscape. Gorges can occur in a variety of landscapes and can range greatly in size. They are often found in areas of limestone or sandstone, and are often filled with spectacular scenery, including waterfalls, rapids, and cliffs. Gorges can also be formed by ice, erosion, and glacial activity.
The maximum width of the gorge that the secret agent can clear is given by the equation:
W = 2v0^2 * sin(2θ) / g
Where W is the maximum width of the gorge, v0 is the initial speed of the agent, θ is the angle of the slope, and g is the acceleration due to gravity.
Substituting the given values into the equation, we get:
W = 2 * (12.9 m/s)^2 * sin(2 * 28°) / 9.81 m/s^2
W = 33.2 m
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reposting this question
a plane is flying north at 30 m/s. it is encountering wind blowing east at 5m/s. what is the airplane's speed?
Answer:
30.41 m/s
Explanation:
To solve this problem, we can use vector addition. We can represent the velocity of the plane as a vector pointing north with a magnitude of 30 m/s, and the velocity of the wind as a vector pointing east with a magnitude of 5 m/s.
The speed of the airplane is the magnitude of the resultant vector, which is the vector sum of the velocity of the plane and the velocity of the wind. To find the magnitude of the resultant vector, we can use the Pythagorean theorem:
magnitude of resultant vector = sqrt((30 m/s)^2 + (5 m/s)^2) = sqrt(900 m^2/s^2 + 25 m^2/s^2) = sqrt(925 m^2/s^2) = 30.41 m/s
Therefore, the speed of the airplane is approximately 30.41 m/s.
Learning Goal:
To understand the meaning of Kepler's second law of planetary motion.
Part A
Parts A through C all refer to the orbit of a single comet around the Sun.
Each of the four diagrams below represents the orbit of the same comet, but each one shows the comet passing through a different segment of its orbit around the Sun. During each segment, a line drawn from the Sun to the comet sweeps out a triangular-shaped, shaded area. Assume that all the shaded regions have exactly the same area. Rank the segments of the comet’s orbit from left to right based on the length of time it takes the comet to move from Point 1 to Point 2, from longest to shortest. If you think that two (or more) of the diagrams should be ranked as equal, drag one on top of the other(s) to show this equality.
According to Kepler's Second Law, as a planet orbits the Sun, an imaginary line connecting them sweeps across the same amount of space. This means that planets need not travel along their orbits speed.
What purposes does Kepler's law serve?The study of the motion the planets, asteroids, or other space objects inside the solar system makes extensive use of Kepler's laws. They are still used today to create and launch satellites into orbit. The Kepler principles served as inspiration for Newton, who then proposed his original three laws of motion and the concept of universal gravitation.
What is the name of Kepler's first law?The planets' orbits are ellipses with the light at one focus, according to Kepler's First Law, sometimes referred to as The Law on Ellipses. The line between such a planet or the sun sweeps forth equal areas inside the plane of planetary system over equal times, according to Kepler's Second Law, often known as The Law for Equal Areas at Equal Time.
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explain how the sun drives convection currents in the ocean and in the atmosphere
Answer:
here u go
Explanation:
The heating of the Earth's surface and atmosphere by the sun drives convection within the atmosphere and ocean. This convection produces winds and ocean currents. The greater the pressure differences between a low-pressure area and a high-pressure area, the stronger the winds.
What other transformation is used to create this pattern
The other transformation used in creating this pattern other than translation is 180° rotation.
What is pattern transformation?Pattern transformation refers to the process of altering or manipulating a basic pattern in order to create a new and unique design. This can involve changing the scale, orientation, color, or other characteristics of the original pattern.
One common method of pattern transformation is through repetition, where a pattern is repeated in a regular or irregular arrangement. This can create a sense of movement, rhythm, or complexity within the design.
The pattern in the image contains translation and rotation (180°) symmetries, the pattern is referred to as SPINNING HOP according to Conway.
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A 12-foot ladder is leaning against a wall. The bottom of the ladder is 5 feet away from the bottom of the wall. Approximately how high up the wall does the top of the ladder reach? responses 2. 4 feet 2. 4 feet 7. 0 feet 7. 0 feet 10. 9 feet 10. 9 feet 13. 0 feet.
The ladder's top extends around 10.9 feet up the wall. Solution is option d.
Using the Pythagorean theorem, we can determine the height up the wall that the top of the ladder reaches,
c^2 = a^2 + b^2
where c is the length of the ladder, a is the distance from the bottom of the ladder to the wall, and b is the height up the wall that the top of the ladder reaches.
In this case,
c = 12 feet
a = 5 feet
Plugging these values into the equation,
b^2 = c^2 - a^2 = 12^2 - 5^2 = 144 - 25 = 119
b = sqrt(119) = 10.9 feet (approximately)
Therefore, the top of the ladder reaches approximately 10.9 feet up the wall. Answer is option d.
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--The complete question is, A 12-foot ladder is leaning against a wall. The bottom of the ladder is 5 feet away from the bottom of the wall. Approximately how high up the wall does the top of the ladder reach?
a. 2.4 feet
b. 7.0 feet
c. 0.9 feet
d. 10.9 feet
e. 13.0 feet.--
Resolving power(R.P) is a function of the wavelength of light used and the numerical aperture of the objective lens. It is expressed as the smallest distance between two points that can still be discerned as discrete entities.
Given that R.P. = wavelength/ (2* N.A) Calculate the resolving power of your microscope when using the oil immersion lens. Assume that visible light has an average wavelength of 0.55 um (a um= 0.000001 meters).
The resolving power of the microscope is approximately 0.196 μm when using the oil immersion lens.
What is Aperture?
In optics, the aperture refers to the opening or hole in an optical system through which light passes. It is typically a circular or rectangular opening that can be adjusted to control the amount of light that enters the system. The aperture size affects various properties of the optical system, such as the depth of field, the amount of light that reaches the sensor or film, and the resolving power or sharpness of the resulting image. The numerical aperture (N.A.) is a related term that describes the ability of an optical system to gather light, and it is determined by the size of the aperture and the refractive index of the medium through which light passes.
To calculate the resolving power (R.P.) of the microscope, we can use the formula:
R.P. = wavelength / (2 * N.A.)
where wavelength is the average wavelength of visible light, and N.A. is the numerical aperture of the objective lens.
Given that the average wavelength of visible light is 0.55 μm (micrometers), and assuming we are using an oil immersion lens, which typically has a numerical aperture of around 1.4, we can plug in these values and solve for R.P.:
R.P. = (0.55 μm) / (2 * 1.4)
R.P. = 0.196 μm
Therefore, the resolving power of the microscope is approximately 0.196 μm when using the oil immersion lens.
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In a local bar, a customer slides an empty beer mug down the counter for a refill. The height of the counter is 1.34 m. The mug slides off the counter and strikes the floor 0.60 m from the base of the counter.
(a) With what velocity did the mug leave the counter?
(b) What was the direction of the mug's velocity just before it hit the floor?
The cup left the counter with a speed of 5.16 m/s.
What is its maximum speed?An object's ultimate velocity can be expressed as: v = u + at, where v is the final velocity. The final velocity of an object is equal to its original velocity plus acceleration multiplied by the distance it traveled.
The conservation of energy principle can be used to determine the speed at which the cup departed from the counter.
The following factors determine the mug's potential energy:
PE = mgh
PE = (m)(9.81 m/s²)(1.34 m) = 13.3m J
where J denotes joules.
KE = (1/2)mv²
v = sqrt(2PE/m) = sqrt(2gh)
With the values from the problem substituted, we obtain:
v = sqrt(2 x 9.81 m/s²x 1.34 m) = 5.16 m/s.
The mug's velocity was downward or vertically downward shortly before it impacted the ground.
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Which of the following correctly explain why the pressure of a gas in a rigid container increases with increasing temperature? SELECT TWO ANSWERS The average molecular speed increases with temperature, so the molecules collide with the walls of the container more frequently. The average molecular kinetic energy increases with temperature, so the molecules exert a larger average force on the walls of the container when they collide with the walls of the container. The average molecular kinetic energy increases with temperature, so the molecules exert a larger average force on each other when they collide with each other. The average molecular speed increases with temperature, so the molecules collide with each other more frequently.
How mechanical energy can be transformed into wind energy and how
Explanation:
As wind moves past the blades of a wind turbine, it moves or rotates the blades. These blades turn a generator. A generator works as an inverse of an electric motor; instead of applying electrical energy to turn it and create mechanical energy, it uses mechanical energy to turn and create electrical energy. SIMPLE WORDS: a wind turbine moves which is mechanical energy and the way it moves is by the wind blowing and it goes both ways mechanical energy into wind energy wind energy into mechanical and when turbines move it creates wind also
