Chapter 14, Problem 56P

The 50-lb load is hoisted by the pulley system and motor M. If the motor exerts a constant force of 30 lb on the cable, determine the power in hp that must be supplied to the motor if the load has been hoisted s = 10 ft starting from rest. The motor has an efficiency of 0.76.

Determine the power input for a motor necessary to lift 280 lb at a constant rate of 6 ft/s. The efficiency of the motor is ϵ = 0.65. Express your answer with the appropriate units.

The box having mass of m is being pulled by a motor. Initial velocity of the box is v0. Motor pulles the box by force F= 500s+550, where s is the distance the box is pulled (meters), and force is in newtons. Define the velocity and acceleration of the box as a function of distance ‘s’. If the motor has efficiency of ε = 0.65, power input required to be supplied by the motor as a function ofdistance.

The block has a mass of 50 kg and rests on the surface of the cart having a mass of 75 kg. If the spring which is attached to the cart and not the block is compressed 0.2 m and the system is released from rest, determine the speed of the block with respect to the cart after the springg becomes undeformed. Neglect the mass of the wheels and the spring in the calculation. Also the neglect friction. Take k = 300N/m,

Escalator steps move with a constant speed of 0.6 m/s. If the steps are 125 mm high and 250 mm in length, determine the power of a motor needed to lift an average mass of 150 kg per step. There are 32 steps. if the escalator is not moving, determine the constant speed at which a man having a mass of 80 kg must walk up the steps to generate 100W of power-the same amount that is needed to power a standard light bulb.

A block with a weight of 5 kg hanging from the ceiling attached to a spring is raised and then pulled downward. As it passes downward through the spring's unstretched position it has a speed of 10 m/s downward. If the spring has a stiffness of 5 N/m, determine the maximum position below the spring's unstretched position achieved by the block.

The 1.5 Mg car increases its speed uniformly from rest to 36 m/s in 8 s up the inclined road. Determine the maximum power that must be supplied by the engine, which operates with an efficiency of ε = 0.42. Also, find the average power supplied by the engine.   Please show every single step of the process thanks

If the motor draws 60 kW of electrical power, determine the motor's efficiency. Neglect the mass of the pulleys and cable. Express your answer using three significant figures.

The 100-kg crate is hoisted by the motor M. If the velocity of the crate increases uniformly from 1.5 m/s to 4.5 m/s in 5 s, determine the tension developed in the cable during the motion.