A tired squirrel (1kg mass) does push-ups by applying a force to elevate its chest by 5 cm. Estimate the number of push-ups that a tired squirrel must do in order to do approximately 5J of work.

The magnitude of the poynting vector of a planar electromagnetic wave has an average value of 0.939 w/m^2 . the wave is incident upon a rectangular area, 1.5 m by 2.0 m, at right angles. how much total electromagnetic energy falls on the area during 1.0 minute?

How to tell if two objects are in thermal equilibrium 1.the objects have the same temperature 2.the objects are the same size 3.the objects are touching each other 4.the objects temperatures are changing

What does the law of conservation of mass state?