A block is released from rest, at a height h, and allowed to slide down an inclined plane.
There is friction on the plane. At the bottom
of the plane, there is a spring that the block
will compress. After compressing the spring,
the block will slide up the plane to some maxi-
mum height, ha, after which it will again slide
back down.
How much work is done on the block be-
tween its release at height h and its ascent to
its next maximum height?

Oxygen undergoes an isentropic expansion from 120 degree c and 280 kpa absolute to 140 kpa absolute. determine the final temperature of the oxygen and the amount of work per kg of o_2 produced in the process if it is adiabatic.

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !

An isotope undergoes radioactive decay by emitting radiation that has a –1 charge. what other characteristic does the radiation have?