Answer:
The kinetic energy is 16 joules.
Explanation:
Kinetic energy (E) is given by:

Where:
m: is the mass
v: is the speed
When the kinetic energy is 4 joules, the speed of the object is:
Now, if the speed is increased twice then we have:
![E_{2} = \frac{1}{2}mv_{2}^{2} = \frac{1}{2}m(2v_{1})^{2} = \frac{1}{2}m[4(\frac{8}{m})] = 16 J](https://tex.z-dn.net/?f=%20E_%7B2%7D%20%3D%20%5Cfrac%7B1%7D%7B2%7Dmv_%7B2%7D%5E%7B2%7D%20%3D%20%5Cfrac%7B1%7D%7B2%7Dm%282v_%7B1%7D%29%5E%7B2%7D%20%3D%20%5Cfrac%7B1%7D%7B2%7Dm%5B4%28%5Cfrac%7B8%7D%7Bm%7D%29%5D%20%3D%2016%20J%20)
Therefore, the kinetic energy is 4 times the initial value.
I hope it helps you!
Answer:
Hertz is the answer for this question
A : A nebular cloud of dust and gas is the correct answer.
This question is a critical question. as we all know, when energy is added to any state of water, the particles move faster. and when energy is taken away from any state of water, the particles reduce speed. same with the particles of air. when energy is added; they move faster. when energy is removed; they move slower. so the answer is they move faster
A higher frequency. I just got this answer on usa test prep.