Because there is no gravity and sound moves through gravity
Since you are looking for the speed, you need to rearrange the formula which is f = speed / wavelength. That should give you speed = f (wavelength.) All you need to do next is to substitute the value to the following equation. speed = 250 Hz (6.0m) that should leave you with 1500 m/s which is very fast.
That is because work requires energy. According to the law of conservation of energy, it cannot be created or destroyed. When doing work, energy change forms and gets transferred to the object until it is released.
for example, when you lift up an object and place it on a higher elevation, you transferred energy to it and gave it potential energy. The potential energy is transformed into kinetic energy when the object falls down, and if it hits a surface, the energy will scatter, vibrating the areas around it and producing sound.
Also, work= force X distance. The energy does not go away, but rather get changed into some other form of energy
The answer is 5kg m/s with the second momentum being 10 kg m/s. i took the test and it was right. hope this helps yalls
Option C,
Reason
Kinetic energy is proportional to the square of velocity. Thus the higher the velocity the higher will be the kinetic energy
K.E. dog = 1/2 x 10 x (0.44704 x 30)^2 m/s = 899.14 J
K.E. bullet = 1/2 x 0.02 x (0.44704 x 8000)^2 m/s = 127,878 J
