Some small hybrid cars and sports utility vehciles also have spoilers. what is the purpose? is it the same or different from the spoiler on a sports car?

6–43 a food department is kept at 2128c by a refrigerator in an environment at 308c. the total heat gain to the food department is estimated to be 3300 kj/h and the heat rejection in the condenser is 4800 kj/h. determine the power input to the compressor, in kw and the cop of the refrigerator.

Two balls, each with a mass of 0.5 kg, collide on a pool table. is the law of conservation of momentum satisfied in the collision? explain why or why not

Are formed where bumps from two surfaces come into contact ?