All describe work except

a)a team of dogs dragging a sled

b)a jokey sitting on a horse

c)a bowler lifting a bowling ball

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.

Aforce of 100 newtons is used to move an object a distance of 15 meters with a power of 50 watts. find the work dine and the time it takes to do the work