For a machine, the input force is 30 n, and the input distance is 2 m. factoring in the effect of friction, what must be true about the work output?
a. it must be greater than 60 j
b. it equals 60 j.
c. it must be less than 60 j

Clothes dryer uses about 7 amps of current from a 240 volt line. how much power does it use?

A47.2 g block of copper whose temperature is 480 k is placed in an insulating box with a 91.8 g block of lead whose temperature is 200 k. (a) what is the equilibrium temperature of the two-block system? (b) what is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) what is the change in the entropy of the two-block system? the heat capacities of copper and lead are 386 j/kg·k and 128 j/kg·k, respectively.

Atruck with 34-in.-diameter wheels is traveling at 55 mi/h. find the angular speed of the wheels in rad/min, *hint convert miles to inches & hours to minutes: