Which system works similar to a refrigeration system?a a heat pump a thermostat a furnace a heat engine

The free body diagram shows a box being pulled to the left up a 25-degree incline. the magnitude of the normal force is

Afeather of mass 0.001 kg falls from a height of 2 m. under realistic conditions, it experiences air resistance. based on what you know about friction, what can you say about the kinetic energy of the feather as it reaches the ground? acceleration due to gravity is g = 9.8 m/s2. a. ke < 0.0196 j b. ke = 00196 j c. je = 0 j d. ke > 0.0196 j

If a balloon is taken outside on a very cold day, what will occur?