A 1.38-kg block sits on a lab table. The block accelerates to the right at a rate of 2.20 m/s/s There is a forward force of 4.08 N. What is the force pulling the block backwards?

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

Arigid tank is divided into two equal parts by a partition. one part of the tank contains 3 kg of compressed liquid water at 400 kpa and 60°c while the other part is evacuated. the partition is now removed, and the water expands to fill the entire tank. determine the entropy change of water during this process, if the final pressure in the tank is 40 kpa. use steam tables.

Estimate of the number of stars in our galaxy