How does the intensity of a sound wave change if the distance from the source is increased by a factor of 3?
A. The intensity decreases by a factor of 9.
B. The intensity decreases by a factor of 3.
C. The intensity increases by a factor of 9.
D. The intensity increases by a factor of 3.

An object moves from position +34m to the position -15m in 15 seconds. what is the total displacement? what is the total velocity?

Atank has a shape of a cone with a radius at the top of 2 m and a height of 5 m. the tank also has a 1 m spout at the top of the tank. the tank is filled with water up to a height of 2 m. find the work needed to pump all the water out the top of the spout. (use 9.8 m/s2 for g and the fact that the density of water is 1000 kg/m3.)

Acar starts from rest at a stop sign and reaches a velocity of 25 m/s w in 4 seconds. determine the acceleration of the car. question 3 options: a) 6,25 m/s2 b)6.25 m/s c)100 m/s2 d)100 m/s