A hiker at the entrance to a cave yells to produce an echo. If the time between when the hiker yells, and when they hear the echo is 0.28 s, and the speed of sound at that
moment is 345 m/s, how deep is the cave

When someone slams her books on a table the kinect energy is transferred into vibrations that travel to your ears as sound waves which statement describes the movement of those waves

Acentrifuge in a medical laboratory rotates at an angular speed of 3,700 rev/min. when switched off, it rotates through 54.0 revolutions before coming to rest. find the constant angular acceleration (in rad/s2) of the centrifuge. your response is within 10% of the correct value. this may be due to roundoff error, or you could have a mistake in your calculation. carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. rad/s2

Calculate a pendulums frequency of oscillation (in hz) if the pendulum completes one cycle in 0.5s.