sound intensity varies inversely as the square of the distance from the sound source. if you are in a movie theater and you change your seat to one that is eight times as far from the speakers, how does the new sound intensity compare with that of your original seat
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Ответ:
Explanation:
The sound intensity varies inversely as the square of the distance from the sound source. Mathematically,
You change your seat to one that is eight times as far from the speakers, d' = 8d.
New sound intensity is :
So, the new intensity is (1/64) times of the initial sound intensity.
Ответ:
(a) Find the final velocity of the person and cart relative to the ground. = 1.367m/s
(b) Find the frictional force acting on the person while he is sliding across the top surface of the cart = 286.944N
(c) How long does the frictional force act on the person? = 0.5809s
(d) Find the change in momentum of the person. = 166.774N
(e) Determine the displacement of the person relative to the ground while he is sliding on the cart. = 1.5878m
(f) Determine the displacement of the cart relative to the ground while the person is sliding. = 0.3970m
(g) Find the change in kinetic energy of the person. = -455.71J
(h) Find the change in kinetic energy of the cart = 113.99j
(i) Explain why the answers to (g) and (h) differ.
the force exerted on the cart by the person must be equal in magnitude and opposite in direction to the force exerted on the cart by the person. The changes in momentum of the two cart must be equal in magnitude and must add up to zero. The following represents two way thinking about "WAY". The distance the cart moves is different from the distance moved by the point of application of frictional force on the cart.
Explanation:
check attachment for explanation.