At time t=0 a 2150 kg rocket in outer space fires an engine that exerts an increasing force on it in the +x−direction. This forc
1 answer:
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Answer:
The new kinetic energy is 9 times of the initial kinetic energy.
Explanation:
The kinetic energy of an object is given by the formula as follows :
Where
m is mass and v is speed of the body
If the speed of the body is tripled. Let v' is the new speed, v' = 3v. The new kinetic energy is E' and it is given by :
Hence, the new kinetic energy is 9 times of the initial kinetic energy.
Answer:
B) Faster than before
Explanation:
By the time you begin to wiggle the string more rapidly you are indirectly increasing the number of cycles of the generated wave per second. This means that you are increasing the frequency of the generated wave.
Recall that the frequency of a travelling wave depends on the source of the wave. You generating the wave are the source of the wave.
The general relationship between velocity, frequency and wavelength is given by equation (1);
This shows a linear and direct relationship between velocity v and frequency f. That is to say that when frequency increases, velocity will also increase and vice versa.
As long as other factors such as the tension in the string remains constant, wiggling at a more rapid rate increases the frequency and which also increases the velocity, causing the wave to travel faster than before.