Answer:
Lever
Explanation:
Fulcrum point is the point where the lever turns.
It is the center of a key activity
Answer:
B) A lever
Explanation:
List the 2 advantages and 2 disadvantages of wind as a source of electricity.
Answer:
The first 2 advantages of wind a source of electricity is that it provides you wifi and wind. 2 disadvantages of wind as a source of electricity is that to much wind could knock it down or slow down the source of the electricity.
Explanation:
I know this because i read a article on it.
what can be done to double the power output of an object?
Answer: double the speed of the object.
Explanation:
From the definition of power, power is the rate at which work is done. That is,
Power P = Work done/time
But
Work done = force × distance
Work done = F×S
Substitute F × S for work done on power formula.
P = (F×S)/t
P = F × S/t
But S/t = velocity V
P = F × V
Since power P is proportional to speed V, to double the power output of an object, the speed V of the object must be doubled.
Answer:
double speed
Explanation:
A driver moves with initial velocity of 40m/s accelerates uniformly at a rate of 12m/s2. It attains a velocity 52m/s. calculate the distance covered during the journey.
Answer:
distance=46m
Explanation:
initial velocity(u)=40m/s
final velocity(v)=52m/s
acceleration=12m/s²
distance(s)=?
v²=u²+2as (using equ.of motion)
(52)²=(40)²+2(12)s
2704=1600+24s
24s=2704-1600
24s=1104
s=1104/24
s=46m
The distance covered during the journey is 46m.
To find the answer, we need to know about the Newton's equation of motion.
What are the Newton's equation of motion?Newton's equation of motion are
V=U+atS=Ut+1/2at²V²-U²=2×a×SWhere S=distance
U=initial velocity
V=final velocity
t=time
a= acceleration
What is the distance covered by the driver, if the driver has initial velocity 40m/s, final velocity 52 m/s and acceleration 12 m/s²?Here, U=40m/s, V=52m/s and a= 12 m/s²So, 52²-40²=2×12×S=>2704-1600=24×S
=>1104=24S
=>S=1104/24=46m
Thus, we can conclude that the distance covered during the journey is 46m.
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What is the inverse tangent of 0.9?
O A. 64.2
O B. 90.0
O C. 42.0
O D. 0.016°
Answer:
i think the aswers is C,
Which data set has the largest standard deviation?
A. 20, 21, 23, 19, 19, 20, 20
OB. 1.6,3, 15, 4, 12, 8
O C. 3.4.3.4.3.4.3
O D. 12. 14, 13, 14, 12, 13, 12
Answer: B
Explanation:
Given the following data :
A. 20, 21, 23, 19, 19, 20, 20
B. 1, 6,3, 15, 4, 12, 8
C. 3.4.3.4.3.4.3
D. 12. 14, 13, 14, 12, 13, 12
Standard deviation = √[Σ(x - μ) / n]
Where x = scores, μ = mean value of the scores or data, n = number of values in the data.
And mean(μ) = Σx / n
Using the online standard deviation calculator :
For data A: 20, 21, 23, 19, 19, 20, 20
σ = 1.2777531299999
For data B : 1, 6,3, 15, 4, 12, 8
σ = 4.6598589800857
For data C: 3,4, 3, 4, 3, 4, 3
σ = 0.49487165930539
For data D: 12, 14, 13, 14, 12, 13, 12
σ = 0.83299312783504
Therefore data B has the largest standard deviation.
Which best describes the act of using senses or tools to gather information?
ОООО
creating a hypothesis
making an observation
summarizing the results
recording the measurements
Answer:
Making an observation
Explanation:
By observing, you can draw qualitative and quantitative data from the subject of observation
How do scientists look for black holes in space? Describe what a black hole looks like using one of the different ways of seeing the sky?
Answer:
Scientists can't directly observe black holes with telescopes however we can infer the presence of black holes and study them by detecting their effect on other matter nearby. Scientists look for black holes by using x-rays, visible light and radio waves. By a black hole, the sky looks normal then the stars closer to the black holes look like they are spinning around the black hole.
What is the correct interpretation of the formula Mg3B2?
Answer: C. There are 3 magnesium for every 2 bromine
Explanation: The formula Mg3Br2 represents the compound formed from the reaction between Magnesium metal and bromine. The compound is usually called magnesium bromide formed from ionic or eoectrovalent bonding of magnesium and bromine. The compound's could be interpreted to mean for there to attain stability, there are 3 magnesium ions for every 2 bromine.
(Mg^2+) + (Br^-1)
How does radiation help treat cancer?
It cools down the cancer cells and weakens them.
It cools down the non-cancerous cells and strengthens them.
It heats up the cancer cells and weakens them.
It heats up the non-cancerous cells and strengthens them.
Answer:
C. It heats up the cancer cells and weakens them.
Explanation:
Trust me it is correct the other people are wrong.
The radiation that helped the treating cancer should be option C. It heats up the cancer cells and weakens them.
What is radiation therapy?It is also known as radiotherapy represents the cancer treatment that used a high dose of radiation for killing the cancer cell also the tumors should be shrunk. Here the dose should be low and the radiation should be used in x-rays for seeing inside the body where x-rays of the teeth or bones that should be broken.
Therefore, option c is correct.
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Explain how reflection and refraction are similar to each other and different from each other.
Answer:
Reflection is the bouncing back off light rays when it hits a surface whilst refraction is the change in direction if light as it travels from one medium to another.They both need a medium or surface to be able to work
Explanation:
When a wave that is moving through a medium encounters the border of that medium, reflection and refraction, both wave characteristics, take place.
Both refraction and reflection alter the wave's behavior by altering the direction it travels in or the rate at which it moves.
What is Refraction?Refraction is the process by which a wave switches while transitioning from one material to another in physics. As an illustration, waves move more quickly in the open ocean than those in the shallow.
A wave can swing around until it is moving perpendicular to the coastline if it is approaching a beach at an angle because the wave's outer portion goes quicker than its inner portion.
When light strikes a material on a plane, reflection occurs, which is when the light bounces back. Refraction is indeed the technique by which light's path changes when it passes through a substance, bending the light.
This is the primary distinction between refraction and reflection. Usually, mirrors are where this occurrence happens.
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MEANING OF ELECTRIC POTENTIAL?
PLEASE TELL.
Answer:The work per unit of charge required to move a charge from a reference point to a specified point, measured in joules per coulomb or volts
Explanation:
Answer: electric Potential Energy. Potential energy can be defined as the capacity for doing work which arises from position or configuration. In the electrical case, a charge will exert a force on any other charge and potential energy arises from any collection of charges.
A brick is thrown from a wall that is 19.2 m above the ground and hits the ground 5.00 s later. What was the initial velocity of the brick?
Answer:
0
Explanation:
Given the following :
Height of wall = 19.2 m
Time taken to hit the ground = 5 seconds
Acceleration due to gravity (g) = 9.8m/s ( downward motion)
The initial velocity of the object refers to the Velocity of the object at time t = 0
Initial Velocity = g × time
Initial Velocity = 9.8 × 0 = 0
Answer:
20.6
Explanation:
How does increasing the distance between two charges affect force?
Answer:
the electrical force between two charges and force are inversely related which denotes that if distance is increased then the forces holding the charges decrease and vice versa.
Hope i have helped
Thank you.
how do you calculate heat resistance
Answer:
Thermal Resistance (R-Value)
According to this definition and Equation 1, Equation 2, therefore, can be obtained. As indicated in Equation 2, the value of the thermal resistance can be determined by dividing the thickness with thermal conductivity of the specimen.
Hydrogen/hydronium ion concentration
Answer:
Pure water is considered to neutral and the hydronium ion concentration is 1.0 x 10-7 mol/L which is equal to the hydroxide ion concentration. So the pH is the -log of the [hydronium ion].
Explanation:
Pure water is considered to neutral and the hydronium ion concentration is 1.0 x 10-7 mol/L which is equal to the hydroxide ion concentration. So the pH is the -log of the [hydronium ion].
Why would physics be used to study the movement of ocean waves?
A. Ocean waves are interesting.
B. Ocean waves are useful.
C. Ocean waves are made of matter.
D. Ocean waves are on Earth.
True/False: Paraphrasing Einstein’s Theory of General Relativity, gravity "handprint" makes an "indentation" in the fabric of space and time. A. True B. False
Paraphrasing Einstein’s Theory of General Relativity, gravity "handprint" makes an "indentation" in the fabric of space and time. - this is False.
What is Einstein's Theory of General Relativity?According to Einstein's general theory of relativity, which was published in 1915, the space-time curvature is what causes what we experience as the force of gravity. According to the scientist, this geometry is altered by the sun and the Earth.
According to Ghez, who added that her research team is one of only two in the world to have observed a star known as S0-2 complete an orbit in three dimensions around the supermassive black hole at the centre of the Milky Way, the laws of physics, including gravity, should hold true everywhere in the universe.
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A semitruck (m. 20,000 kg) is 10 m from a car (m 2000 kg) What is the force of gravity between them? (0.667 10-11 N•m²/kg)
A. 2.67 104N
B. 1.22 104N
c. 1.22 105N
D. 267 . 10-5N
Answer: D
Explanation:
Given information:
Semi truck mass M = 20000kg
Car mass m = 2000 kg
Distance d = 10 m
G = (0.667 10-11 N•m²/kg)
The gravitational force between them can be expressed as
F = GMm/r^2
Substitute all the parameters into the formula
F = (0.667 10-11 × 20000 × 2000)/ 10^2
F = 2.668×10^-4/100
F = 2.668 × 10^-6 N
Therefore, the force of gravity between them is 26.7 × 10 ^-5 N approximately
Road conditions due to weather, like rain or ice, could result in the loss of control of your vehicle due to reduction in friction.
True
False
Answer:True
Explanation:
? Question
Type the correct answer in the box. Round your answer to the nearest whole number.
Calculate the mass of the ball using PE = m*g x h. (Hint: Rearrange the formula to solve for m.)
kilograms.
A ball held 2.0 meters above the floor has 59 joules of potential energy. The ball's mass is about
(Use g = 9.8 N/kg.)
Answer:
1,156.4 but to the nearest whole number it's 1,156
Explanation:
PE= m×g×h
59×9.8×2.0
= 1,156.4
nearest whole number -1,156
How do scientists use hotspot volcanism to tell the direction and speed
of a plate?
A region of the Upper crust where hot plumes can emerge and erupt as volcanoes on the crust above is referred to as the hotspot volcanism.
What is hotspot volcanism?Hotspots are areas of volcanic activity that are assumed to be fueled by an earth's mantle that is abnormally hot compared to the surrounding mantle. Hawaii, Iceland, and Yellowstone are a few examples. Hotspots may form a chain of volcanoes when the plates move above them because their position just on Earth's surface is autonomous of tectonic plate boundaries.
Geologists will need some hotspot chains to determine the direction and pace at which a plate is moving because many hotspots in the mantle are immobile. The majority of hot spots are located far from continental plates, yet they nonetheless provide a tool to gauge plate mobility. This is due to the fact that a hot point typically doesn't move, unlike the plate boundary above it. The heat from the plume causes some of the rock inside the plate boundary above a hot point to partially melt.
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in an experiment what are all the parts of an experiment that remain unchanged are called
Answer:
The answer is Control Variable.
How long will a radioactive isotope decay?
Until there's none of it left. Different radioactive isotopes decay at different rates. And a bigger pile of it will last longer than a smaller pile. Without knowing WHICH radioactive isotope you're asking about, and how much of it you started out with, the answer could turn out to be anywhere between 1 millionth of a second and 1 million years.
Liz has designed a sailboat. She wants to build a prototype of the boat. Liz has $12,000 to spend on the boat. $7,000 of that money is budgeted for wood. Liz needs 500 ft of wood planks.
Assuming that Liz will use only one type of wood for her entire project, which of the following could she use to stay on budget?
A. Marine plywood only.
B. She could use any of these woods listed.
C. Marine plywood of Douglas for only.
D. Marine plywood, Douglas fir, or white oak only
Answer:
A. Marine plywood only.
Explanation:
A lens of focal length 15.0 cm
forms an image 77.5 cm from the
lens. What was the object
distance?
(Unit = cm)
Answer:
5
Explanation:
The distance of the object is 18.6cm.
How to find the object's distance?According to lens formula we have (1)/(v) + (1)/(u) = (1)/(f), where u = distance of the object from the lens, v = distance of the image from the lens and f = focal length of given lens.
1 / v + 1 /u = 1/f
1 / 15 + 1 /u = 1/77.5
1/77.5 - 1 / 15 = 1/f
1/f = 6 / 465 - 31 / 465
1/f = -25 / 465
1/f = 465 / 25
1/f = 18.6
Lens formula is a well-designed formula that is applicable for concave as well as convex lenses.
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What is the name of the process that involves a strong attractive force that keeps atoms together
Answer:
chemical bond
Explanation:
if the moon did not revolve around the sun, would we still see moon phases?
Answer:
First of all the moon does not revolve around the sun but around the earth but yes we would not see moon phases if the moon did not revolve around the earth.
Explanation:
Which describes how fast-moving particles assist in transferring thermal energy to a cup after hot tea is poured into it?
They replace slow-moving particles.
They collide with slow-moving particles.
They collide with other fast-moving particles.
They are replaced by slow-moving particles.
Answer:
They collide with slow moving particles (B)
Explanation:
Thermal energy is transferred through particles. Particles cannot be replaced, so both A and D are out. In order for thermal energy to be transferred, you must have 2 different substances with different temperatures, so C is out. That leaves you with A. I also took the test on Edge.
The fast movement of particles assisted in transferring the thermal energy represents the colliding of the slow-moving particles.
What is thermal energy?
Thermal energy is also known as the heat energy that should be generated at the time when there is an increase in the temperature that resulted in atoms and molecules to move quicker and colliding with each other. It should be transferred via particles. Also, the particles should not be replaced.
Therefore, the correct option is B.
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How do Newton's laws of motion explain why it is important to keep the ice smooth on a hockey rink so that players can
pass a puck as quickly as possible?
OSmooth ice reduces the inertia of the hockey puck.
Smooth ice increases the force used to accelerate the hockey puck.
Smooth ice reduces the unbalanced forces that would slow the hockey puck.
Smooth ice decreases the reaction force that the ice exerts on the hockey puck.
Save and Fxit
Answer:
c
Explanation:
edge 2021
A student is pushing a box across the room. To push the box three times farther, the student needs to do how much work?
Answer:
Removing some of the books reduced the mass of the box, and less force was needed to push it across the floor.
