If you lift a 200 newton box 1 meter with a rope and is the system and you apply 20 newtons to lift this box, what to mechanical advantage of the system? how far do you have pull the rope when you are applying the input force? if you do this work in 5 seconds, what is the power?

What are atoms of the same element with varying number of neutrons

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.

Aball is thrown horizontally from a cliff at 8m/s .in what direction is the ball moving 2s later?