Acrate slides down a ramp that makes a 20∘ angle with the ground. to keep the crate moving at a steady speed, paige pushes back on it with a 76 n horizontal force. part a how much work does paige do on the crate as it slides 4.0 m down the ramp? express your answer with the appropriate units.

Describe different biomes. what are some adaptations that organisms (plants or animals) must have to live in each biome?

Astudent is performing an experiment comparing sound and light waves. the student gathers the following data. what conclusion does the student most likely make based on this data? light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. all sound waves always have the same energy, so the temperature of the medium does not affect wave speed. light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.

If a refrigerator is a heat pump that follows the first law of thermodynamics, how much heat was removed from food inside of the refrigerator if it released 380j of energy to the room?