Why is it harder pushing a car than pushing a bike?

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.

At what time will the interfering waves have an amplitudeof zero?

If the specific heat of a metal is 0.850 j/g °c, what is its atomic weight?