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crimeas [40]
3 years ago
8

Part A Which of these is exhibiting kinetic energy?

Physics
1 answer:
Rzqust [24]3 years ago
4 0

Answer:

a space station orbiting Earth

Explanation:

Kinetic energy in an object arises from the motion of the object.

\frac {1}{2}\times m\times v^2 is the kinetic energy of object.

(a) a person sitting on a couch while watching TV

The person is still and is not in motion and thus, do not exhibit any kinetic energy.

(b) an archer with a flexed bow

The archer hold the bow flexed. It may have a lot of potential energy but not kinetic energy as it is still.

<u>a space station orbiting Earth</u>

<u>The space station is moving and is in motion and thus, exhibits kinetic energy.</u>

(c) a rock on a mountain ledge

The rock is on a mountain ledge . It may have a lot of potential energy but not kinetic energy as it is still.

(d) the high-energy phosphate bonds of a molecule of ATP

The bonds are still and is not in motion and thus, do not exhibit any kinetic energy.

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A boy throws a ball straight up into the air. It reaches the highest point of its flight after 4 seconds.
Zanzabum

Answer:Take into account the the Earths gravity is 9.8 meters a second

Explanation:

Gravity pulls down on the ball at g=-9.81 m/s^2. Up is positive, down is negative.The ball started at a certain initial velocity of Vi m/s. Time it took is t=4s. Final velocity is Vf=0 m/s, because at the highest point the ball stops moving.

Vf=(g*t)+Vi

Rearrange for Vi.

Vi=Vf-(g*t)

Vi=0-(-9.81*4)=39.24 m/s (upward)

Think about it this way for the non-mathematical approach. The ball stops at the top. The initial velocity gets reduced by 9.81 m/s every second, and reaches 0 m/s at the top. It took 4 seconds, so 9.81*4 is equal to the initial upward velocity.

8 0
3 years ago
A science-fiction tale describes an artificial "planet" in the form of a band completely encircling a sun. The inhabitants live
arlik [135]

Answer:

8.97 days

Explanation:

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The period of revolution T is given as

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here, r= distance between planet and its sun which is same as distance between Earth-Sun = 149.7\times10^9 m

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therefore,

T=2\pi\sqrt{\frac{149.7\times10^9}{9.81} }

=775580 seconds

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6 0
4 years ago
What is the speed of a wave that has a frequency of 125 Hz and a wavelength of 1.25 meters?
kirill115 [55]
Using the "v = f. λ" <span>equation...
 
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5 0
3 years ago
An object travelling at 12 m/s has 64.8j of stored kinetic energy. What is the mass of the object, in grams?​
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Answer:

So u divided 12 divided by 64.8 okay

Explanation:

and when I getc the answer that's urs answer

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