The gazelle has zero average acceleration because it's moving at a constant speed. Constant speed means no change in speed means zero acceleration.
The cheetah, on the other hand, changes its speed from 0 m/min to 1820 m/min in a matter of 3 seconds, so its average acceleration is
a[ave] = (1820 m/min - 0 m/min) / (3 s)
… = (1820 m/min) / (3/60 min)
… = 36,400 m/min²
… = (36,400 m) / (60 s)²
… = 91/9 m/s² ≈ 10.1 m/s²
A diver, of mass 40kg, climbs up to a diving platform 1.25m high. What’s her KE
Explanation:
The formula for KE ( Kinetic Energy ) is : 1/2 mv²
Solution:
First we solve for v ( velocity ) using the formula 2gh, where g is gravity [ 9.8 m/s² ] and h is height [ 1.25 m ]= 2 ( 9.8 m/s² × 1.25 m ) = 24.5 m/s
The velocity is 24.5 m/s.Now solve for KE using the formula 1/2 mv²= 1/2 ( 40 kg × 24.5m/s ² )
= 1/2 ( 40 kg × 600.25 )
= 1/2 ( 24,010 )
= 12,005 Joules
The diver's kinetic energy is 12,005 J.What is the gain in speed per second for a freely falling object?.
Objects accelerate at ~9.8 Meters per second per second (9.8 Meters peer sec^2. (or ~32 feet per sec^2 for you non metric guys) As they gain speed they will reach a maximum velocity limited by atmospheric resistance, when the resistance vector equals the gravity vector and all acceleration will cease. In a vacuum the object will continue to accelerate.
Which term describes what a british thermal unit measures?.
Answer:
it is a measure of the heat content of fuels or energy sources
Explanation:
A shoe and a shirt are released from the same height. They take different amounts of time to fall to the ground. How can this be explained? (1 point) The difference in weight doesn't affect the time, but they are affected differently by air resistance. O The weight is equal on the two objects, but there is more air resistance on the shoe. O The masses of the two objects are the same, but they are affected differently by air resistance. O The weight is greater on the shoe than on the shirt, but there is equal air resistance on the objects.
The best explanation for the difference in time is: A. The difference in weight doesn't affect the time, but they are affected differently by air resistance.
What is weight?Weight can be defined as the force acting on an object or a physical body due to the effect of gravity. Also, the weight of an object (body) is typically measured in Newton.
The factors that affect weight.Some of the factors that affect the weight that is possessed by an object or a physical body include the following:
MassDistanceAir resistanceIn conclusion, the weight possessed by the shoe and shirt has no effect on time but would be affected differently by air resistance.
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A body of mass 20kg initially at rest is subjected to a force of 40m for 15sec. Calculate the change in k.e
Explanation:
mass(m)=20kg
velocity(v)=d/t=2.67
k.e=?
now,
k.e=1/2mv^2
=1/2*20*(2.67)^2
=71J
Answer:
Explanation:kE =10kg(7.3m²/s²)
=73J
plz help me thank you
Mateo moved the teacher's table with 50 N of force for 2 meters.. How
much work is done in pushing the table?
Statement:
Mateo moved the teacher's table with 50 N of force for 2 meters.
To find out:
The work done in pushing the table.
Solution:
Force (F) = 20 NDisplacement (s) = 2 mAngle between displacement and force (θ) = 0We know, work is said to be done when force acting on a body produces motion in the direction of force applied.And the formula for work done isF s Cos(θ)Therefore, the work done in pushing the table= 50 × 2 × Cos (0°) J= 100 × 1 J= 100 JAnswer:
The work done in pushing the table is 100 J.
Hope it helps.
If you have any query, feel free to ask.
What do potential and kinetic energy have in common? **hint: compare their formulas and see what they have in common** Question 5 options: They're both related to density. They're both related to mass. They're both related to volume. None of the above.
The mass is common in potential and kinetic energy. The potential energy of an object is due to its position.
What is a Potential Energy?The potential energy of an object is due to its position. It can be calculated by the formula,
[tex]U = mgh[/tex]
Where,
[tex]U[/tex] - potential energy
[tex]m[/tex] - mass
[tex]g[/tex] - gravitation acceleration
[tex]h[/tex] - height
Kinetic energy:The kinetic energy of an object is due to its motion. It can be calculated by the formula,
[tex]KE = \dfrac 12 mv^2[/tex]
Where,
[tex]m[/tex] - mass
[tex]v[/tex] - velocity
Therefore, the mass is common in potential and kinetic energy.
Learn more about potential energy:
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If θ=0rad
θ
=
0
r
a
d
at t=0s
t
=
0
s
, what is the blade's angular position at t=20s
t
=
20
s
?
Answer:
π
Explanation:
ok that is the answer ok
A ball is dropped from a height of 50m. What will be its velocity before touching ground?
Statement:
A ball is dropped from a height of 50 m.
To find out:
The velocity of the ball before touching the ground.
Solution:
Initial velocity (u) = 0 m/s [since the ball was at rest before it was dropped]Height (h) = 50 mAcceleration due to gravity (g) = 9.8 m/s²Let the velocity of the ball before touching the ground be v.We know, the equation of motion for a freely falling body, v² = u² + 2gh.Putting the values in the above equation, we getv² = [(0)² + 2(9.8)(50)] m/sor, v² = 980 m²/s² or, v = √980 m/sor, v = 31.3 m/sAnswer:
The velocity of the ball before touching the ground is 31.3 m/s.
Hope you could understand.
If you have any query, feel free to ask.
What is the difference between speed and velocity?
[tex] \huge \sf \color{purple}{Ѕрееᴅ:}[/tex]
Speed is simply the rate of change of motionSpeed is the distance traveled by a body in a unit time.[tex] \huge \sf \bold \color{purple}{Ѵеʟосітч:}[/tex]
Velocity is direction - aware & it is rate of change of position of an object.Velocity is the displacement coved by a body in a unit time.Hope Helpful~Differences between Speed and Velocity
Or simply, it is the distance traveled by a body in a unit of time. Velocity is direction-aware and it is the rate of change of position of an object. Speed is a scalar quantity, i.e., it has only magnitude. Velocity is a vector quantity, i.e., it has both magnitude and direction.
A. The cart will move to the left
B. The cart will move to the right
C. The cart will alternate between moving left and right
D. The cart will remain stationary
Answer:
A. The cart will move to the left
Explanation:
Right has more force acting on the cart than the left
If you help I will give you a brainly!!!! Thank you
Answer:
An example of a first class lever in the human body is the head and neck during neck extension. The fulcrum (atlanto-occipital joint) is in between the load (front of the skull) and the effort (neck extensor muscles). The muscles are attached to the posterior part of the skull to allow for the greatest effort arm.
Explanation:
hope this helps. Thank you
A bullet of mass 0.01 kg is fired into a sandbag of mass 0.49 kg hanging from a tree .The sandbag, with the bullet embedded into it, swings away at 10m/s.
find:
a.The momentum after the collision.
b.The momentum before the collision.
c.The velocity of the bullet.
Answer:
B is the best option but A is also good it's up to you but I'm leaning more towards B
Answer:
momentum after=momentum before
momentum before=Mbullet*Vbullet
Momentum after=(.49+.01)10=Mb*Vb
solve for V bullet
A 1450 kg torpedo strikes a 670 kg target that is initially at rest. If the combined torpedo and target move forward with a speed of 10.6 m/s, what is the initial velocity of the torpedo? Assume that no resistance is provided by the water.
By conservation of momentum, we will see that the initial velocity of the torpedo is 15.4 m/s
How to apply conservation of momentum?The conservation of momentum says that the total momentum before the collision must be the same as after the collision.
Before the collision we have a momentum:
P₀ = torpedo momentum + target momentum.
Where the momentum is given by:
Momentum = Mass×Velocity.
Then the initial momentum is:
P₀ = (1450kg)*V + (670 kg)*0m/s
Where V is the initial velocity of the torpedo.
For the final momentum, the torpedo and the target travel together with a velocity of 10.6 m/s, so we can see that the final momentum is:
P₁ = (1450kg + 670kg)*10.6m/s
Because of the conservation, we must have:
P₀ = P₁
(1450kg)*V = (1450kg + 670kg)*10.6m/s
(1459kg)*V = 22,472 kg*m/s
V = (22,472 kg*m/s)/(1459kg) = 15.4 m/s
So the initial velocity of the torpedo was 15.4 m/s
If you want to learn more about momentum, you can read:
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How does Kinetic Energy and the Law of Conservation of Momentum apply to inelastic
collisions?
Answer:
Explanation:
An inelastic collision is one in which the internal kinetic energy changes (it is not conserved) . The two objects come to rest after sticking together, conserving momentum. But the internal kinetic energy is zero after the collision.
Answer:
Explanation:
Why does the inelastic collision momentum remain conserved while the kinetic energy changes?
Imagine two objects colliding, M1 and M2. Let’s say that M1 slows down and M2 speeds up. The change in momentum for M1 will be equal to the Impulse acting on M1 which is defined as the force on M1 multiplied by the time interval the force acts. The change in momentum for M2 will be the force on M2 multiplied by that SAME time interval. The two forces are an action-reaction pair; M2 pushing on M1 and M1 pushing back on M2.
Since the two forces are equal and opposite and the time intervals are equal, the two Impulses must also be equal and opposite, and so will cancel each other out. If the TOTAL Impulse is zero there will be NO change in total momentum. So momentum must be conserved during the collision.
The situation with kinetic energy is different. Kinetic energy is changed by Work, defined as force times distance. While the two forces acting on the two objects are equal and opposite (as described above), the distances traveled by the two objects during the collision are NOT necessarily equal to each other. So kinetic energy is not automatically conserved.
One of the requirements of an inelastic collision is one in which the two objects colliding do NOT travel the same distance during the collision.
how does the wind reversing make the tempurature change asap pls
Answer:
Because the difference in air temperature of neighbouring air masses causes the wind to blow. Warmer air is less dense, so colder air subsides into the space occupied by the warmer air due to the force of gravity, displacing the warmer air upwards. This is fundamentally the reason temperature change may be accompanied by wind. It is possible to think of situations where only one of these effects is observed at any one place, due to the large size or stationary nature of atmospheric boundary phenomena.
Explanation:
Answer: The temperature of the air does not change the heat loss from the skin changes. Wind helps remove the warm air next to the skin and makes it feel colder.
Explanation:
A bag of cement has a mass of 62 g. What is the mass of the bag of cement in S.I. units (kg)?
The mass of this bag of cement in S.I. units (kg) is equal to 0.062 kilograms.
Given the following data:
Mass of cement = 62 grams.To calculate the mass of this bag of cement in S.I. units (kg):
How to convert to S.I. units.In Science, kilograms (kg) is the standard unit of measurement or S.I. units of the mass of a physical object. Thus, we would convert the value of the mass of this bag of cement in grams to kilograms (kg) as follows:
Conversion:
1000 grams = 1 kilograms.
62 grams = X kilograms.
Cross-multiplying, we have:
X = [tex]\frac{62}{1000}[/tex]
X = 0.062 kilograms.
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a light has a wavelength of 5.06x10-7m. what is the frequency of the light?
So, the frequency of that light approximately [tex] \sf{\bold{5.93 \times 10^{14} \: Hz}} [/tex]
IntroductionHi ! Here I will help you to discuss the relationship between frequency and wavelength, with the velocity constant of electromagnetic waves in a vacuum. We all know that regardless of the type of electromagnetic wave, it will have the same velocity as the speed of light (light is part of electromagnetic wave too), which is 300,000 km/s or [tex] \sf{3 \times 10^8} [/tex] m/s. As a result of this constant property, the shorter the wavelength, the greater the value of the electromagnetic wave frequency. This relationship can also be expressed in this equation:
[tex] \boxed{\sf{\bold{c = \lambda \times f}}} [/tex]
With the following condition :
c = the constant of the speed of light in a vacuum ≈ [tex] \sf{3 \times 10^{8} \: m/s} [/tex] m/s[tex] \sf{\lambda} [/tex] = wavelength (m)f = electromagnetic wave frequency (Hz)Problem SolvingWe know that :
c = the constant of the speed of light in a vacuum ≈ [tex] \sf{3 \times 10^{8} \: m/s} [/tex] m/s[tex] \sf{\lambda} [/tex] = wavelength = [tex] \sf{5.06 \times 10^{-7}} [/tex] m.What was asked :
f = electromagnetic wave frequency = ... HzStep by step :
[tex] \sf{c = \lambda \times f} [/tex]
[tex] \sf{3 \times 10^8 = 5.06 \times 10^{-7} \times f} [/tex]
[tex] \sf{f = \frac{3 \times 10^8}{5.06 \times 10^{-7}}} [/tex]
[tex] \sf{f \approx 0.593 \times 10^{8 - (-7)}} [/tex]
[tex] \sf{f \approx 0.593 \times 10^{15}} [/tex]
[tex] \boxed{\sf{f \approx 5.93 \times 10^{14} \: Hz}} [/tex]
Conclusion :So, the frequency of that light approximately [tex] \sf{\bold{5.93 \times 10^{14} \: Hz}} [/tex]
See More :What affects photon energy https://brainly.com/question/26434060What is the foton energy https://brainly.com/question/26518899A flash of light caused by a dishcharge of static electricity.
Answer:
Lightning is a flash of light created by electric discharge between clouds or between cloud and the ground or any object on the ground.
Which of the following animals have adapted to live in the arctic tundra? (Select all that apply.)
Answer:
no way I had that question too :-O anyways here's the answer
Explanation:
willow ptarmigan and Walia ibex
The area of a telescope lens is 7903 mm2. If a technician takes 45 s to polish an area of 135 mm2, how long (in hours) does it take to polish the whole lens
Answer: 0.0851 ft2
Explanation:
If the net force acting on a sliding block is somehow tripled, what happens to the acceleration?.
Answer:
triple
Explanation:
you can see in the equation a = F/m that acceleration is directly proportional to the force. If you use numbers and plug them in you can see that as well a = 3F/1M = 3
if an object is being pulled by two forces, one 4n to the left, and the other 2 n to the right, what is the net force acting on the object?
Answer:
2 N to the left
Explanation:
When a cyclist moves downhill without pedalling, what type of energy does he gain?
Answer:
He is gaining kinetic energy and losing potential energy
Explanation:
Answer:
Kinetic or motion energy
Explanation:
A ball is tossed upwards into the air with an initial upwards velocity of 3.0m/s. What is the ball's velocity when it returns to the height from which it was tossed?
Which is constant on the whole way of travel of the ball.
As no change in acceleration there is no change in velocity at end and it remains at 3m/s
Determine the work done by 2. 00 kg of water when it is all boiled to steam at 100 ∘c. Assume a constant pressure of 1. 00 atm.
The work done by the water at the constant pressure is [tex]-4.52 \times 10^6 \ J[/tex].
Heat required to boil the waterThe heat required to boil the water is calculated as follows;
[tex]Q = mL_v\\\\[/tex]
where;
[tex]L_v[/tex] is the heat of vaporization of water = 22.6 x 10⁵ J/kgm is mass of water[tex]Q = 2 \times 22.6 \times 10^5\\\\Q = 4.52 \times 10^6 \ J[/tex]
Work done by the waterThe work done by the water at the constant pressure is equal to the heat gained by the water.
[tex]W = - \Delta H\\\\W = -4.52 \times 10^6 \ J[/tex].
Learn more about first law of thermodynamics here: https://brainly.com/question/2965070
use the exploration to explain the difference between observed motion, when force is applied in a direction which is same direction of motion and when it is against the direction of motion
Answer:
When a force acts on an object that is stationary or not moving, the force will cause the object to move, provided there are no other forces preventing that movement. If you throw a ball, you are pushing on it to start its movement. If you drop an object, the force of gravity causes it to move.Answer:
When a force acts on an object that is stationary or not moving, the force will cause the object to move, provided there are no other forces preventing that movement. If you throw a ball, you are pushing on it to start its movement. If you drop an object, the force of gravity causes it
Explanation:
Which method does not demagnetise a bar magnet? A Heat the bar magnet and place it in the east-west direction to cool. B Place the bar magnet in the east-west direction and hammer it. C Place the bar magnet in a coil connected to an a.c. supply and slowly withdraw it. o Place the bar magnet in a coil connected to a dc. supply and slowly withdraw it.
Answer:
C
Explanation:
( I dun know how to explain it but i do know that the answer is C. Saw it in a past paper.)
A solid rectangular block is formed by gluing together N congruent 1-cm cubes face to face. When the block is viewed so that three of its faces are visible, exactly 231 of the 1-cm cubes cannot be seen. Find the smallest possible value of N.
Answer:
462
Explanation:
231 cubes= half of N (because only 3 of the faces are visible, there are 6 faces altogether)
N=462
