Answer:
hope this helps you :)
Explanation:
An object is in motion if its position changes relative to another object. To decide if you are moving, you can use your chair as a reference point. A reference point is a place or object used for comparison to determine if something is in motion.
Austin kicks a soccer ball with an initial velocity of 18.0 m/s at an angle of 35.0°. What are the horizontal and vertical components of the initial velocity? Round your answers to the nearest tenth. vix = m/s viy = m/s
Answer:
(vix, viy) = (14.7 m/s, 10.3 m/s)
Explanation:
The velocities of interest are ...
(vix, viy) = (vi)(cos(35°), sin(35°)) = (18 m/s)(cos(35°), sin(35°))
(vix, viy) = (14.7 m/s, 10.3 m/s)
Answer:
First one = 14.7
Second one = 10.3
Explanation:
EDGE
A softball player moving 3.89 m/s
starts a slide, decelerating at -1.44 m/s2
for 4.80 m. How much time does the
slide take?
Answer:
0.119 s
Explanation:
Given that
[tex]U=3.89\ m/s\\a=-1.44\ m/s^2\\S=4.8\ m[/tex]
Lets take final speed of the softball after covering 4.8 m = V
We know that
[tex]V^2=U^2+2aS\\V^2=3.89^2-2\times 1.44\times 4.8\\V=3.7\ m/s[/tex]
Also We know that
[tex]V=U+at\\[/tex]
Putting the value of V ,U and a in the previous equation We get
[tex]3.7=3.89-1.44\times t\\t=0.119\ s[/tex]
Therefore slide time will be 0.119 s
Answer:
1.9
Explanation:
I am on acellus and thats the right answer lol
BRAINLIEST! I NEED HELP ASAP!
The ratio of xi to xo for a certain mirror is 2.5. Which is true of an image produced by this mirror?
It is 2.5 times larger and virtual.
It is 2.5 times larger and real.
It is 2.5 times smaller and virtual.
It is 2.5 times larger and real.
The true of an image produced by this mirror will be 2.5 times smaller and virtual. Option C is correct.
What is the image?When light beams from an object reflect off a mirror, they intersect with the picture of that thing called an image. Real and virtual images are the two sorts of images.
The ratio of xi to xo for a certain mirror is 2.5;
[tex]\rm \frac{x_i}{x_0} =2.5 \\\ x_i=2.5 x_0[/tex]
Where,
[tex]\rm x_0[/tex] is the true of an image produced by this mirror.
The true of an image produced by this mirror will be 2.5 times smaller and virtual.
Hence,option C is correct.
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You can make a smoothie in a blender with a power of 400 watts and an efficiency of 85 percent. How much energy is actually being used to make the smoothie in 30 seconds?
A) 8600 J
B) 3000 J
C) 6580 J
D) 10,200 J
Answer:
Its D
Explanation:
I got help from another user lol
Answer:
D!!!
Explanation:
I had this question on my assignment and got it right!
To which category does galaxy #4 belong? Why does it belong in this category?
Answer:
The Galaxy IV satellite belongs to the HS-601 model category. It was engineered by Hughes Space and Communications Company (HSC)
Explanation:
The Galaxy IV belong in this category because it is a communications satellite. It was built for direct television broadcasting, for private business networks and mobile communications.
Cheers!
give relation between potential work and time
Relation between work done and potential is a change in the potential energy associated with the force. The negative sign provides the convention that work done against a force field increases potential energy, while work done by the force field decreases potential energy.
I NEED HELP PLEASE THANKS! :)
Enter the appropriate word(s) to complete the following statement. A green object will absorb ____________________ light and reflect ____________________ light.
Answer:
A green object will absorb all but green light and reflect green light.
Explanation:
Green objects appear to be green because they reflect green light.
All other colors are absorbed.
What does Force Components mean?
Why a flying areoplane has more kinectic energy than a flying insect
Answer: Because the angle of attack is so high, a lot of momentum is transferred downward into the flow. These two features create a large amount of lift force as well as some additional drag.
Brainlest would be much appreciated.
3. Ultraviolet can kill these.
8words and 2nd letter starts with an A
Answer:
Bacteria
Explanation:
UV kills bacteria and its 8 letters
An apple dropped from the branch of a tree hits the ground in 0.5 s. If the acceleration of the apple during its motion is 10 ms-2 in the downward direction. Calculate ----- Its speed just before it hits the ground. What is its average velocity during 0.5 s? Calculate the height of the branch of the tree from the ground?
Given that,
Time = 0.5 s
Acceleration = 10 m/s²
(I). We need to calculate the speed of apple
Using equation of motion
[tex]v=u+at[/tex]
Where, v = speed
u = initial speed
a = acceleration
t = time
Put the value into the formula
[tex]v=0+10\times0.5[/tex]
[tex]v=5\ m/s[/tex]
(III). We need to calculate the height of the branch of the tree from the ground
Using equation of motion
[tex]s=ut+\dfrac{1}{2}gt^2[/tex]
Put the value into the formula
[tex]s=0+\dfrac{1}{2}\times10\times(0.5)^2[/tex]
[tex]s=1.25\ m[/tex]
(II). We need to calculate the average velocity during 0.5 sec
Using formula of average velocity
[tex]v_{avg}=\dfrac{\Delta x}{\Delta t}[/tex]
[tex]v_{avg}=\dfrac{x_{f}-x_{i}}{t_{f}-t_{0}}[/tex]
Where, [tex]x_{f}[/tex]= final position
[tex]x_{i}[/tex] = initial position
Put the value into the formula
[tex]v_{avg}=\dfrac{1.25+0}{0.5}[/tex]
[tex]v_{avg}=2.5\ m/s[/tex]
Hence, (I). The speed of apple is 5 m/s.
(II). The average velocity during 0.5 sec is 2.5 m/s
(III). The height of the branch of the tree from the ground is 1.25 m.
Which best describes the importance of mitosis to living organisms? genetic variation and growth growth and development development and sexual reproduction sexual reproduction and genetic variation
Answer:
b.
Explanation:
Mitosis is important for growth and development of living organisms.
The major importance of mitosis is growth and development. The correct option is B.
What is mitosis?Mitosis is the method by which a cell replicates as well as then segregates its chromosomes, and generates two identical nuclei in order to divide.
Mitosis is basically followed by the equal division of the cell's contents into two daughter cells with identical genomes.
Mitosis occurs in the following stages:
The chromosomes shorten a s well as thicken during the phase called as prophase.Metaphase - Chromosomes align in the equator of the cell. Chromatids separate at the centromere as well as move to opposite poles during anaphase. Telophase - The generation of two nuclei after nuclear envelopes reform around each chromosome group.One cell divides once during mitosis to form two identical cells. Mitosis is primarily responsible for cell growth and replacement.
Thus, the correct option is B.
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Use the drop-down menus to complete the
sentences below.
Cocoa mix is the
DONE
Water is the
DONE
The picture shows a great deal of Cocoa mix on
the surface. Suppose that no more cocoa can be
dissolved. The solution has reached
Answer:
Solute
Solvent
Saturation
Explanation:
A great deal of cocoa mix on the surface. Cocoa is the solute. Water is the solvent. The solution has reached the saturation.
What is the saturation?The saturation is the state at which the solute dissolves no more.
The liquid is more in quantity is the solvent which is water here. The cocoa is added next, which is the solute generally less in quantity than solvent.
The addition of cocoa is continued till it stops dissolving. This state is reached at saturation.
Therefore, Cocoa is the solute. Water is the solvent. The solution has reached the saturation.
Learn more about saturation.
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what goes up but never comes down i know the answer but do you?
Answer:
Our Age :(
Explanation:
we will always age
A gardener uses 2700 J of work to push a wheelbarrow for 60 seconds. How much power does she use?
Answer:
I think 90 w I am not sure but I think it is right
I hope it is helpful for u
Answer:
45 WSolution,
Work(W)=2700 Joule
Time(t)=60 Seconds
Power=?
Now,
[tex]power = \frac{work \: done}{time \: taken} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{2700}{60} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 45 \: \: watt[/tex]
hope this helps..
Good luck on your assignment..
Which of the following describes sound waves
A. Waves that do not require a medium and in which the vibrations are parallel to the motion of the sound
B. Waves that require a medium and in which the vibrations are perpendicular to the motion of the sound
C. Waves that do not require a medium and in which the vibrations are perpendicular to the motion of the sound
D. Waves that require a medium and in which the vibrations are parallel to the motion of the sound
Answer:
your answer would be D because the waves results from back n forth vibrations of the particles of the medium throught which the sound waves is moving .
A sound wave is a type of wave that requires a medium and in which the vibration is parallel to the motion of the sound.
A wave is form of disturbance that transfers energy form one point to another.
There are two types of waves; mechanical wave and electromagnetic wave.
Electromagnetic wave does not require material medium for its propagation.Mechanical wave requires material medium for their propagation.An example of mechanical wave include;
Sound wave is an example of mechanical wave because it requires material medium for its propagation.Sound wave is a also longitudinal type of wave because its vibration occurs parallel to the motion of the sound wave.Thus, we can conclude that a sound wave is a type of wave that requires a medium and in which the vibration is parallel to the motion of the sound.
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I NEED HELP PLEASE, THANKS! :)
A positively charged light metal ball is suspended between two oppositely charged metal plates on an insulating thread as shown below. After being charged once, the plates are disconnected from the battery. Describe the behavior of the ball.
Answer:
The ball will be attracted to the negatively charged plate. It'll touch and pick up some electrons from the plate so that the ball becomes negatively charged. Immediately the ball is repelled by the negative plate and is attracted to the positive plate. The ball gives up electrons to the positive plate so that it is positively charged and suddenly attracts to the negative plate again, flies over to it and picks up enough electrons to be repulsed by negative plate and again to the positive plate and that continues.
The behavior of the ball will be like a pendulum kind of motion swinging between the two charged plates.
The positive ball would go toward the negatively charged plate first. After which, it would lose the positive charge and becomes negatively charged. Due to the negative charge, it will repel the negatively charged plate and will start traveling towards the positive plate this time.
The process would continue which will create a pendulum kind of motion for the charged light metal ball between the plates, and this will continue until either of the one the positive or the negative plate became neutral (discharged).
Hence, the behavior of the ball will be like a pendulum kind of motion swinging between the two charged plates.
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A baseball is hit by a batter with an initial velocity of 95 miles per hour at 45° above the horizontal. The opposing team misses the catch and the baseball lands in the outfield 50 meters from where it started. How long was the baseball in the air
Answer:
5.61 seconds
Explanation:
The baseball moves as a projectile. Its angle is 45° and its velocity is 95 miles per hour.
Let us convert this to metres per second:
1 mile per hour = 0.45 m/s
95 miles per hour = 95 * 0.45 = 42.75 m/s
We need to find the time of flight of the baseball. Time of flight is given as:
[tex]T = \frac{2u sin\alpha }{g}[/tex]
where u = initial velocity
α = angle
g = acceleration due to gravity (9.8 m/s)
Therefore:
[tex]T = \frac{2 * 42.75 * sin40}{9.8}\\ \\T = 5.61 secs[/tex]
The baseball was in the air for 5.61 seconds.
Which element is a metalloid? selenium (Se) polonium (Po) phosphorus (P) iodine (I)
Answer:
Polonium(Po)
Explanation:
Answer:
B. polonium (Po)
Explanation:
i took the test
A plane mirror is useful for seeing:
They are used to see round dangerous bends
a rollercoaster car is moving 19.8 m/s on flat ground when it’s hits the brakes. it decelerates at -3.77 m/s^2 over the next 45.8 m. how much time does it take?
Answer:
3.44 s
Explanation:
Given:
Δx = 45.8 m
v₀ = 19.8 m/s
a = -3.77 m/s²
Find: t
Δx = v₀ t + ½ at²
45.8 = 19.8 t + ½ (-3.77) t²
45.8 = 19.8 t − 1.885 t²
1.885 t² − 19.8 t + 45.8 = 0
t = [ -b ± √(b² − 4ac) ] / 2a
t = [ 19.8 ± √((-19.8)² − 4 (1.885) (45.8)) ] / 2(1.885)
t = [ 19.8 ± √(392.04 − 345.332) ] / 3.77
t = 3.44 or 7.06
The first time, 3.44 seconds, is correct.
The second time is the time it would take the car to return to 45.8 m if it continued decelerating after stopping.
An electric current always produces a magnetic field that is ______ to the field. A. perpendicular B. parallel C. at a 37° angle D. none of the above
Answer:perpendicular
Explanation:
The electric current always generated the magnetic field that should be perpendicular to the field.
Relationship of electric current and magnetic field:In the case when the work should be compassed when the pointing is to be done along with the magnetic field lines so this represent that there should be the magnetic field that should be near the wire via the current should be flowing. here the magnetic field generated by the electric current should always be perpendicular to the current flow direction.
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a zebra starts from rest and accelerates at 1.9 m/s2 what will be the acceleration after 5 seconds
Answer:
d = 23.75 m
The zebra has gone 23.75m after 5 seconds.
Corrected question;
A zebra starts from rest and accelerates at 1.9 m/s2. How far has the zebra gone after 5 seconds.
Explanation:
From the equation of motion;
d = vt + 0.5at^2 .........1
Where;
d = displacement
v = initial velocity = 0
t = time taken= 5 seconds
a = acceleration = 1.9 m/s^2
Substituting the given values into equation 1;
d = 0(5) + 0.5(1.9×5^2)
d = 0.5(1.9×5^2)
d = 23.75 m
The zebra has gone 23.75m after 5 seconds.
A box is pulled to the right with a force of 65 N at an angle of 58 degrees to the horizontal. The surface is frictionless. The free body diagram is shown.What is the net force in the x-direction?
Answer: 34.4N
Explanation:
Given the following :
Applied force (F) = 65N
Angle of inclination (Θ) = 58°
g = acceleration due to gravity = 9.8m/s^2
Therefore, net force in the x-direction is given has;
The horizontal component of force;
Fx = mgCosΘ
Fhorizontal = mass × acceleration due to gravity × cosΘ
mass × acceleration due to gravity = 65N
Fx = 65N × Cos58°
Fx = 65 × 0.5299192
Fx = 34.44N
A 4kg box accelerated from rest by a force across the floor at a rate of 2m/s^2 for 7 seconds. What is the net work done on the box?
Answer and work is shown in the image attached.
please mark me brainliest :)
The solution in the first answer is excellent.
Here's another way to do it:
Force = (mass) x (acceleration)
Force = (4 kg) x (2 m/s²)
Force = 8 Newtons
Distance = (1/2) (a) (T²)
D = (1/2) (2 m/s² ) (7 sec)²
D = 49 meters
Work = (force) x (distance)
Work = (8 N) x (49 m)
Work = 392 Joules yay!
The average US house uses 10,972 kilowatt hours (kWh) in a year, an average of about 914 kWh per month. 1) hoover dammm produces about 4 billion kilowatt hours per year. How many houses can it power? 2) If the average (not hoover) dammm is 15 meters in height, how much water would have to drop out of the dam to power a house for a year?
Answer:
1) 364,564 houses
2) Approximately 2.7 × 10⁸ litres of water annually
Explanation:
The power consumption of the average household = 10,972 kWh/year
The power consumption, [tex]P_{(consumed/house)}[/tex] of the average household = 914 kWh/month
The amount of power produced, [tex]P_{produced}[/tex], by the Hoover Dam = 4×10⁹ kW/year
1) The number of houses, n, the Hoover Dam can power is given by the relation;
[tex]n = \dfrac{P_{produced}}{P_{(consumed/house)}} = \dfrac{4 \times 10^9}{10972} = 364,564.35 \ houses[/tex]
Which is approximately 364,564 houses
2) Given the height, h = 15 m
We have at 100% efficiency,
The potential energy of the water per year = 10,972 kWh
The potential energy of the water = m×g×h
Where:
g = Acceleration due to gravity = 9.81 m/s²
∴ The potential energy of the water = m×9.81×15
Therefore, we have;
m×9.81×15 = 10,972 kWh = 10972×60 min/hour ×60 seconds/minute Joules
m×9.81×15 = 39,499,200 kJ = 39,499,200,000 J
m = 39,499,200,000/(9.81 × 15) = 268,428,134.6 kg
The volume, V, of water that would have to drop out of the dam to power a house for a year is given by the relation;
Volume = (Mass of water)/(Density of water)
V = (268,428,134.6 kg)/(1000 kg/m³)
V = 268,428.135 m³ ≈ 2.7 × 10⁸ litres of water annually.
A boat takes 4 hours for travelling downstream from point A to point B and coming back to point A upstream. If the velocity of the stream is 2 Kmph and the speed of the boat in still water is 4 kmph, whit is the distance between A and B
Answer:
d = 6 km
Explanation:
In this case we have the relative speed of the boot changes, suppose that the boat and the river have the same direction when the boat goes from A to point B
vbr = vrt + vbt
vbr = 2 + 4
vbr = 6 km / h
v₁ = 6 km / h
velocity is constant
v₁ = d / t₁
t₁ = d / v₁
when the boat returns to the starting point the speed is both opposite
vbr = vbt - vrt
vbr = 4-2
vbr = 2 km / h
v₂ = 2 km / h
as the speed is constant
t₂ = d / v₂
they also indicate that the total time is 4 h
t₁ + t₂ = 4
we substitute
4 = d / v₁ + d / v₂
4 = d (1 / v₁ + 1 / v₂)
d = 4 / (1 / v₁ + 1 / v₂)
let's calculate
d = 4 / (1/6 + 1/2)
d = 4 / 0.6666 67
d = 6 km
define hardware.Give 2 examples
Answer:
They are the physical parts of a computer.
examples :monitor,keyboard,system unit and mouse.
Which phrase best describes the time period in which the current body of scientific knowledge was developed? A. Just over the last 50 years B. Throughout all of history C. Mostly in the 20th century D. Mostly during Roman times
Answer:
The correct option is;
B. Throughout all of history
Explanation:
A body of knowledge comprises of a given collection of concepts, activities and terms that represents a professional discipline that is outlined by the associated scholarly society, therefore, scientific knowledge, being comprised of very diverse field of knowledge, with different approaches and changing understanding is taking as a process of learning about the universe data collection, experimenting analysis and communication with a theme of systems, equilibrium, models and constant change which makes the basis of the body of scientific knowledge to be throughout all of history.
Please Help!!!!
A helicopter flies with an airspeed of 42.5 m/s [W]. If the wind is traveling with a velocity of 25.0 m/s [E30°S] relative to the ground then determine the velocity of the helicopter relative to the ground.
a) Use the data from the question to determine the velocity components for the helicopter’s speed relative to the air and the wind’s speed relative to the ground.
b) Use your velocity components from part (a) and determine the resultant velocity for each component. (In other words, determine the resultant horizontal component for the helicopter’s ground speed and the resultant vertical component for the helicopter’s ground speed).
c) Using your data, determine the resultant velocity of the helicopter relative to the ground.
Answer:
a) The vertical component of the helicopters speed relative to the air = 0 m/s
The horizontal component of the helicopters speed relative to the air = -42.5 m/s
The vertical component of the wind speed relative to the ground = -21.65 m/s
The horizontal component of the wind speed relative to the ground = 12.5 m/s
b) The x-component of the helicopter speed relative to the wind speed = -30 m/s
The y-component of the helicopter speed relative to the wind speed = -12.5 m/s
c) The resultant speed of the helicopter relative to the ground is 32.5 m/s in the direction of W 22.6° S
Explanation:
The speed of the helicopter = 42.5 m/s
The direction of flight of the helicopter = West
The wind speed = 25.0 m/s
The direction of the wind = E30°S
a) The velocity components of the helicopters speed relative to the air are;
Vertical component = 0 m/s
Horizontal component = -42.5 m/s
The velocity components of the wind speed relative to the ground are;
Vertical component = -25 × cos(30) = -21.65 m/s
Horizontal component = 25 × sin(30) = 12.5 m/s
b) To find the speed of the helicopter relative to the wind we have;
x-component of the helicopter speed = -42.5 m/s
y-component of the helicopter speed = -0
x-component of the wind speed relative to the ground = 25×sin(30) = 12.5 m/s
y-component of the wind speed relative to the ground = -25×cos(30) = -21.65 m/s
Therefore, the x-component of the helicopter speed relative to the wind speed = -42.5 + 12.5= -30 m/s
the y-component of the helicopter speed relative to the wind speed = 0 + (-12.5) = -12.5 m/s
c) The resultant speed of the helicopter relative to the ground is given by the relation;
[tex]v_{h, ground} =\sqrt{(v_{h,horizontal})^2 + (v_{h,vertical})^2}[/tex]
= √((-30)² + (-12.5)²) =32.5 m/s
The direction of motion from the x-axis is given as follows;
[tex]tan(x) = \dfrac{Vertical \ velocity \ component}{Horizontal \ velocity \ component} = \dfrac{-12.5}{-30} = \dfrac{5}{12}[/tex]
[tex]x = tan^{-1} \left (\dfrac{5}{12} \right ) = 22.62 ^{\circ}[/tex]
Therefore, the helicopter is flying at 32.5 m/s in the direction of W 22.6° S.
