An elevator has a mass of 1160 kg and carries a maximum load of 612 kg. A constant frictional force of 3330 N retards its motion upward. What power must the motor deliver at a instantaneous speed of 3.38 m/s if the elevator is designed to provide an upward acceleration of 1.4 m/s²? The acceleration due to gravity is 9.8 m/s². Answer in units of W.
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- An elevator has a mass of 1160 kg and carries a maximum load of 612 kg. A constant frictional force of 3330 N retards its motion upward. What power must the motor deliver at a instantaneous speed of 3.38 m/s if the elevator is designed to provide an upward acceleration of 1.4 m/s2? The acceleration due to gravity is 9.8 m/s². Answer in units of W. Your response... Previous Responses X #1.55825.432 PALETTEA shopper pushes a grocery cart 39.25 m on level ground, against a 37.06 N frictional force. The cart has a mass of 19.79 kg. He pushes in a direction 24.67º below the horizontal. If the initial velocity was 1.78 m/s, and final speed was 16.88 m/2. What is the work done by the pushing force in unit of Joule?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
- The loaded cab of an elevator has a mass of 2.40 × 103 kg and moves 181. m up the shaft in 28.0 s at constant speed. At what average rate does the force from the cable do work on the cab?What average mechanical power (W) must a 76.5kg mountain climber generate to climb to the summit of a hill of height 405 m in 46.0 min? Due to in converting chemical energy to mechanical energy, the amount calculated here is only a fraction of the power that must be produced by the climber's bodyA motorist driving a 1332-kg car on level ground accelerates from 20.0 m/s to 30.0 m/s in a time of 5.00 s. Ignoring friction and air resistance, determine the average mechanical power in watts the engine must supply during this time interval.
- A tower crane has a hoist motor rated at 169 hp. If the crane is limited to using 65.0% of its maximum hoisting power for safety reasons, what is the shortest time in which the crane can lift a 5.50 x 10 kg load over a distance of 89.0 m? Assume the load is lifted at a constant velocity. t = S 仙登A car accelerates uniformly from rest to 29.7 m/s in 8.07 s along a level stretch of road. Ignoring friction, determine the average power required to accelerate the car if (a) the weight of the car is 7.22 × 103 N, and (b) the weight of the car is 1.40 × 10^ N.A 65-kg woman runs up a flight of stairs in 10.0 s. Her net upward displacement is 3.0 m. Approximately, what average power did the woman exert while she was running? 0.1911 kW 191.1 kW 1.911 kW 19.11 kW