Problem (3) A motor M and a frictionless pulley-cable system are used to lift the 850...
The 380-lb cylinder at A is hoisted using the motor and the
pulley system shown. The speed of point B on the cable is increased
at a constant rate from zero to vB = 10 ft/s in t = 5 s
Determine the tension in the cable at B to cause the motion.
Example 14.8 The motor M of the hoist operates with an efficiency of E 0.85. Determine the power that must be supplied to the motor to lift the 375-N crate C at the instant point P on the cable has an acceleration of 1.2m/s2, and a velocity of 0.6 m/s Datum Datum P M
Tension question
Cable ABC has a length of 6 ft and is used to support the 40 lb load (B is a frictionless pulley): 5 ft 1 ft A) Determine the position x and the tension in the cable that is required for equilibrium
Learning Goal:
To use the principle of work and energy to determine
characteristics of a mass being pulled up an incline and determine
the power that must be supplied to the system when the efficiency
of the input system is considered.
As shown, a 62 kg crate is pulled up a θ = 65 ∘incline by a
pulley and motor system. Initially at rest, the crate is pulled s =
2.9 m up along the incline. Undergoing constant acceleration, the...
3. An electric motor draws 2238 W and 12 A when operating on a 240 V source. Determine the (a) Power factor of the motor. (b) Apparent power input to motor. (c) True power input to motor. (d) Horsepower output of the motor if it is 75% efficient. 4 The follwing s found on the nameplate of a motor. 3 hp 60 Hz 1 phase 120/240 V 34/17 A 1,740 RPM irthe power factor of the motor is 0.30, what...
T(N) 1800 T = 2007 A 1 (8) 3 Given: The motor lifts the 20-kg crate with a variable force, T, as defined by the figure below. Find: a) The speed of the crate when t = 2 seconds, starting from rest. Show your work. Include appropriate diagrams. m/s b) The power output of the motor at t - 2 seconds. Show your work. w c) If the efficiency of the motor is € = 0.6, which of t) a...
T(N) 1800 T = 2007 A 1 (8) 3 Given: The motor lifts the 20-kg crate with a variable force, T, as defined by the figure below. Find: a) The speed of the crate when t = 2 seconds, starting from rest. Show your work. Include appropriate diagrams. m/s b) The power output of the motor at t - 2 seconds. Show your work. w c) If the efficiency of the motor is € = 0.6, which of t) a...
PROBLEM 3: Figure 3 shows a top view ofa motor driven pump. The direction of the gravitational acceleration is indicated by g, and is oriented orthogonal to this paper. The shaft of the motor is supported by two bearings in points A and B and the motor rotates at n 1000 rpm. The motor power is 10 kW. The radius of pulley A and B. a-,3 = 40 mm. Each pulley weighs 5 kg. The pump shaft is supported by...
Problem 1. (25 points) A 200-hp 440-V 0.8-PF-leading љс0nnected synchronous motor has an armature resistance of 0.6 Ω and a synchronous reactance of 8.0 Ω. Its efficiency at full load is 90 percent. 1. What is the input power to the motor at rated conditions? 2. What is the line current of the motor at rated conditions? What is the phase current of the motor at rated conditions? 3. What is the reactive power consumed by or supplied by the...