A 2000 kg tractor, starts at the bottom of a 50. m mountain while traveling at 45 m/s. During the trip, air resistance does -100 kJ of work on the tractor, and friction does an additional -550 kJ of the work. What is the minimum amount of work the engine must do in order for the tractor to reach the top?

The step-down transformer gives a current of 10a at 24v if the primary voltage is 240v calculate the 1_primary current 2_the power input 3_the power output

Aturntable a is built into a stage for use in a theatrical production. it is observed during a rehearsal that a trunk b starts to slide on the turntable 10 s after the turntable begins to rotate. knowing that the trunk undergoes a constant tangential acceleration of 0.31 m/s2, determine the coefficient of static friction between the trunk and the turntable.

If you put a helium-filled balloon in the refrigerator, what will happen?