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11. Lifting an elevator cable An electric elevator with a motor at the top has a...
An electric elevator with a motor at the top has a multistrand cable weighing 4 lb/ft. When the car is at the first floor, 150 ft of cable are paid out, and effectively 0 ft are out when the car is at the top floor. How much work does the motor do just lifting the cable when it takes the car from the first floor to the top? The amount of work required is ft-lb. (Simplify your answer.)
9. A crane lifts a 2,000 lb load vertically 30 ft with a 1" cable weighing 1.68 lb/ft. (a) How much work is done lifting the cable alone? (b) How much work is done lifting the load alone? (c) Could one conclude that the work done lifting the ca- ble is negligible compared to the work done lifting the load? 9. A crane lifts a 2,000 lb load vertically 30 ft with a 1" cable weighing 1.68 lb/ft. (a) How...
Problem 1 Equilibrium of a Body in 2D (50pts) The ramp of a ship has a weight of 500 lb and a center of gravity G. An operator weighing 180 Ib is standing at point E, 4.5 ft from A, as shown. Determine the tension on the cable CD needed to just start lifting the ramp, i.e when the reaction at B becomes zero. Also, determine the horizontal and vertical components of force at the hinge at A. Show Free...
using figure 1 and information below find the forces and power needed to move the elevator(lift). needed answers are: 1 finding the service loads 2 mechanical analysis to the shaft 3 power the motor required to move the system. Project Introduction The system to be designed is a lifting system (elevator) for people located in a building using an electric drive system. There is one car that needs to be lifted as high as 15 metres. The arrangement of the...
A skyscraper in Manhattan has an elevator that weighs 1000 kg when loaded. The elevator is lifted at a constant rate to 480m above the ground by an electric winch motor. The drum of the winch motor is a solid uniform cylindrical drum in which a steel cable can wrap around it. The mass of the drum is 500 kg and has a diameter of 1 m. It takes the elevator a total of 120 s to get to the...
A service elevator lifts 300 kg of cargo up to 10 stories (40m). The electric motor that supplies the mechanical energy for the lift uses 3000 kilojoules of electrical energy when performing this task within 20 seconds. How much potential energy does the elevator's cargo have at the end of this short ride (J)? How much work (change in mechanical energy) does this elevator system output by doing this task (J)? What is the energy % efficiency of the system?...
4) A cylindrical can (radius 10 millimeters) is used to measure rainfall in Stormville. The can is initially empty and rain enters the can during a 60-day period. The height of water in the can is modeled by the function S, where S(t) is measured in millimeters and t is measured in days for 0sts 60. The rate at which the height of water is rising in the can is given by S'(t) = 2 sin(0.03t) of the 60-day period?...
Pumping a conical tank A right- circular conical tank, point down, with top radius 5 ft and height 10 ft is filled with a liquid whose weight-density is 60 lb/ft^ 3 . How much work does it take to pump the liquid to a point 2 ft above the tank? If the pump is driven by a motor rated at 275 ft-lb/sec (1/2 hp), , how long will it take to empty the tank? Must work the integral out by...
heeeelp 3. An elevator at Studious University has stopped between the first and second floors. The ca attached to the car wei ghs 5 pounds per foot and is 50 feet long. The car itself weighs 1000 pounds, including two 100 pound students who are trapped inside. To rescue the students, the r must be lifted S Teer by manually winding the cable onto a pulley at the top of the building a. How much work must be done? b....
2) Find the area of the region enclosed by each group of equations. a) y x, y sin x, b) y x2-2x, y= x+ 4 x 3) A particle moves along a straight line with a velocity of 5 cm/s and then accelerates at a rate of a(t) t2+2. What is its displacement after 5 seconds of acceleration (acceleration is in cm/s2) 4) A cylindrical can (radius 10 millimeters) is used to measure rainfall in Stormville. The can is initially...