What happens to the light coming from the Sun? What happens to light on the surface of water?
What happens to light on the surfaces of rocks?
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Photo by Andres Nieto Porras

What is the speed of an object at a given moment?

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.

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.