A 1.50 × 103-kg car starts from rest and accelerates uniformly to 18.0 m/s in 12.0 s. Assume that air resistance remains constant at 400 N during this time. Find (a) the average power developed by the engine and (b) the instantaneous power output of the engine at t = 12.0 s, just before the car stops accelerating.

A 1.50 ✕ 103-kg car starts from rest and accelerates uniformly to 19.9 m/s in 12.7 s. Assume that air resistance remains constant at 400 N during this time. (a) Find the average power developed by the engine. ___hp

A 3.30-kN piano is lifted by three workers at a constant speed to an apartment 27.3 m above the street using a pulley system fastened to the roof of the building. Each worker is able to deliver 141 W of power, and the pulley system is 75.0% efficient (so that 25.0% of the mechanical energy is lost due to friction in the pulley). Neglecting the mass of the pulley, find the time required to lift the piano from the street to the apartment. min

A 1.50 × 103-kg car starts from rest and accelerates uniformly to 16.9 m/s in 11.6 s. Assume that air resistance remains constant at 400 N during this time. (a) Find the average power developed by the engine. hp 29.7 (b) Find the instantaneous power output of the engine at t = 11.6 s, just before the car stops accelerating. 0.079670122 Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. hp Need Help? Read It