At max load, the elevator E weighs 8000 lb. The counterweight C weighs 3500 lb. Research shows that generally speaking, elevator speeds reach up to 600 ft/min, and are designed to accelerate at about 10 ft/s². If the elevator is at capacity, the motor has an efficiency of 85%, and the mechanical systems (pulleys, cables, etc.) experience various energy losses totaling 30%, find the required power input to the motor if... (a) The elevator is accelerating and moving up at maximum rates. (b) The elevator is moving up at a constant max rate. (c) The elevator is moving down at a constant max rate.

At max load, the elevator E weighs 8000 lb. The counterweight C weighs 3500 lb. Research shows that generally speaking, elevator speeds reach up to 600 ft/min, and are designed to accelerate at about 10 ft/s². If the elevator is at capacity, the motor has an efficiency of 85%, and the mechanical systems (pulleys, cables, etc.) experience various energy losses totaling 30%, find the required power input to the motor if... (a) The elevator is accelerating and moving up at maximum rates. (b) The elevator is moving up at a constant max rate. (c) The elevator is moving down at a constant max rate.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Related questions

Q: Problem 2.268 A top-slewing crane is lifting an object C at a constant rate of ż = 5.3 ft/s while…

Q: A wind turbine located at a height of 25m from ground, produces 950 kW. Its hub diameter negligible…

A: Assumption 1) Density of air is 1.2 kg/m3 2) Length of blade and radius of rotation is equal 3)…

Q: The system consisting of objects with mass ma = 1 (kg), mg = 2 (kg) and massless and frictionless…

A: Given data: Mass 'A', mA=1 kg and Mass 'B', mB=2 kg connected to frictionless and massless pulleys…

Q: A certain fan delivers 340 m3/min of air at a static pressure of 25.4 mm of water gage when…

A: Given Data: Volumetric flow rate, Q1=340 m3/min Static pressure head, h1=25.4 mm of water

Q: A pump discharges a liquid into a tank at the rate of 0.032 m³/s. The tank, 1.5 m in diameter and…

A: Discharge-

Q: For a 90° V-twin engine system, having two identical cylinder with center line of each cylinder…

Q: A hydraulic orchard pruner is driven by an engine with an output of 20 bhp . If the pump has a…

Q: Find an expression for the centrifugal force Fc if it depends on the mass m, the angular velocity…

Q: A motor M pulls block B from the rest by a cable with yelocity v-312 mis. At te 2 s, Find the…

A: Given data: Mass of block B, m = 10 kg. Initial velocity of block, u = 0 m/s. From the given…

Q: Hydro-machinery such as turbines and pumps represent fluid devices that have wide variety of…

Q: Two bicycle tires are set rolling with the same initial speed of 3.3 m/sm/s along a long, straight…

Q: An irrigation line carries water from a lake down into an arid valley 810 ft below the surface of…

Q: A 10 kg block slides down from rest on an inclined plane inclined at 25° with the horizontal What…

Q: Q.1) for the system shown in figure (a). The pump has the characteristics shown in figure (b). What…

A: Pressure in lower tank, PL=35 lb/in2=35*144=5040 lb/ft2Pressure in the upper tank, PU=10…

Q: 6. Assume that m₁ = 2.5 kg and m2 = 4 kg. The pulley is frictionless and massless and the string…

A: masses are Angle of inclinationSpring constantCoefficient of friction

Q: (a) Find the useful power output of an e load a height of 450 cm in 12.0 s, if it al 5.00 m/s. Note…

A: Write the work-energy theorem as follows.

Q: A pump sends a substance (sg=1.9) from a tank to a tank placed at a higher level, where the velocity…

A: Given specific gravity Sg = 1.9 velocity at 2 v2 = 1 m/s friction losses hl = 5.8 m efficiency of…

Q: Q3/ A reaction turbine has mean blade speed of 220 m/s and blade speed to steam velocity ratio of…

A: To determine the angle at inlet of blade and work done per kg of steam flow, we can use the…

Q: : The figure show a pump drawing water from a reservoir at point 1 and discharging it into another…

Q: A flypress has two rotating spheres, each of mass 5 kg, fixed to a horizontal arm, s that they are…

Q: Figure 4 shows the hydraulic circuit to perform work with the piston. The pump extracts oil (sg…

A: Given: Specific gravity of the oil is 0.92. The internal diameter of the cylinder is 12 cm. Length…

Q: a continuation of the 1st question, let's assume that we find the required engine power P=3 kW while…

A: from the given dataRA = 96 mmRD = 151 mmRB = ?VD = 7 m/sNA = 2800 rpm

Q: An investment cost for the wind power system is RM 5000 with the annual maintenance costs are RM…

A: Given : D = 30 m P = 400 kWh v = 7.5 m/s ρ=0.602 kg/m3 To find : Efficiency

Q: Two blocks of mass 50 kg and 40 kg are connected by a light inextensible string as shown in Fig.…

A: Given data: The mass of the block 1 is m1=50 kg The mass of the block 2 is m2=40 kg The coefficient…

Q: A 40 kg youth jumps upwards at 8 m/s from a height of 5 m and lands on a trampoline of height 1 m…

Q: 2. The figure shows a pipe reducing section that is bolted on to the end of a pipe. Water flows…

Q: In the system shown in the figure, 100 lt/sec of water from A to B and 50 lt/sec of water to C is…

A: Given Data: Flow rate in pipe DB = QDB=100 lt/sec=0.1 m3/sFlow rate in pipe DC = QDC=50 lt/sec=0.05…

Q: 2 for the system shown in Figure 2, the parameters of pump and motor are as follows: maximal…

A: According to the given information of the system, we have the following parameters which are given…

Q: A block A of 10 kg attached to a spring with K=200 N/m is moving downward along the slope. At this…

A: Given data Mass of block = 10 kg Spring constant = 200 N/m Velocity = 5 m/s Force F = 100 N Slope =…

Concept explainers

Heat Exchangers

Heat exchangers are the types of equipment that are primarily employed to transfer the thermal energy from one fluid to another, provided that one of the fluids should be at a higher thermal energy content than the other fluid.

Heat Exchanger

The heat exchanger is a combination of two words ''Heat'' and ''Exchanger''. It is a mechanical device that is used to exchange heat energy between two fluids.

Question

At max load, the elevator E weighs 8000 lb. The counterweight C weighs 3500 lb. Research
shows that generally speaking, elevator speeds reach up to 600 ft/min, and are designed to
accelerate at about 10 ft/s². If the elevator is at capacity, the motor has an efficiency of 85%,
and the mechanical systems (pulleys, cables, etc.) experience various energy losses totaling
30%, find the required power input to the motor if...
(a) The elevator is accelerating and moving up at maximum rates.
(b) The elevator is moving up at a constant max rate.
(c) The elevator is moving down at a constant max rate.
E
C
M

Expert Solution

This question has been solved!

Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.

SEE SOLUTION Check out a sample Q&A here

Step 1: Write the given data with suitable variables.

VIEW

Step 2: Determine the value of different load and capacity in the cable.

VIEW

Step 3: (b)-Find the power generate by the cable of the motar.

VIEW

Solution

VIEW

Step by step

Solved in 4 steps with 10 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.

Similar questions

A uniform push of 150N, applied at an angle of 30 degrees to a 20kg block which rests on a horizontal surface, gives the block a velocity of 6.5m/s in 4s. Find the coefficient of kinetic friction
As a continuation of the 1st question, let's assume that we find the required engine power P=5 kW while pulling the wagon up in the wagon system in Kardemir. Let's wrap the rope around the drum at v=8 m/s while pulling the wagon up steadily at the desired speed (don't take anything from question 1. Just think of it as a continuation). If the revolution of the motor we will buy from the market is n= 2700 rpm, then RB=? what should we get the radius of the gear? We want to get the radii of the other gears RA = 106 mm, RD = 205 mm
A ball of mass m falls freely from the ground at height h and touches a spring of height h0. The coefficient of the spring is k. Find the length of the ball compressed and how long it takes for the ball's speed to become zero and how long it takes for the ball to return to height h0
4. A concrete weight of 125 kg is released from standstill and a log of mass 200 kg is moved along an inclined area of 30° to the horizontal.When the concrete weight is moved down 5 m, find that 1. What is the speed of the log? 2. What is the movement time of the concrete drum?
5) As a continuation of the 1st question, let's assume that we find the required engine power P=5 kW while pulling the wagon up in the wagon system in Kardemir. Let's wrap the rope around the drum at v=6 m/s while pulling the wagon up steadily at the desired speed (don't take anything from question 1. Just think of it as a continuation). If the revolution of the motor we will buy from the market is n= 2500 rpm, accordingly, the RB=? what should we get the radius of the gear? We want to get the radii of the other gears RA = 61 mm, RD = 147 mm.
Solve it on priority and correctly
A rock is thrown off a cliff with an angle of 50 degrees above the horizontal with an initial speed of 30.0 m/s. The cliff is 93.6 m high. Find the horizontal distance travelled by the rock just as hits the ground below.
A bus of mass 800 kg is travelling witha speed of 8 m/s. What will be the momentum of the bus.
A train has a weight of 100 tons (2,000lbf) is stopped from 4 mph in 1 ft by a hydraulic cushion.If rolling friction is 0.05 of the car weight, Find: • The stopping force using the gs method • The stopping force using the energy method
(Consider the system shown below. The masses are connected by an inextensible band that support both compression and tension. As such, the displacement of each mass is the same. The pulley is massless and frictionless. The displacements are measured from the unstretched position of the spring, friction is ignored, and an external force F(t) acts on mass m,. Gravity is included. Determine the total energy of the system for initial conditions x(0) = 0.01 m and x(0) = 0. Þ ►x(t) iny k mị m2 F(t)
. A pulley used to transmit power by means of ropes has a diameter of 3.5 m and has grooves of 45° angle. The angle of contact is 160° and coefficient of friction between the ropes and groove sides is 0.3. The maximum possible tension in the rope is 1000 N ad the mass of rope is 1.5 kg per metre length. What is the speed of the pulley in rpm and the power transmitted if the condition of maximum power prevail? 10
SOLVE STEP BY STEP A car m = 200 tons makes the journey shown in the figure, if it moves with an initial speed of 150,000 m/s and the maximum height of the path is 15,000 m and the coefficient of friction is 0.4. Find the work of all the forces that intervene at point a, point b and point c, kinetic energy a, b, c, potential energy a, b, c and the power of the car developed along the trajectory Steps draw the free body diagram, the force diagram and use the appropriate equations to find Kinetic energy at points A, B and C Power energy at points A, B and C Power at points A, B and C ● A B 15000 m C