The elevator of a large building is to raise a net mass of 550 kg at a constant speed of 12 m/s using an electric motor. The minimum power rating of the motor should be (a) 0 kW (b) 4.8 kW (c) 12 kW (d) 45 kW (e) 65 kW

Q: The coefficient of friction is 0.30 under block B, and 0.25 under block S in the system…

A: Draw the free-body diagrams of blocks B. Apply force equilibrium.…

Q: Determine the time required to stop a Car weighing 1000 kg, moving at a velocity of 120 km/hr,…

A:

Q: How does the diameter of an air cylinder affect the force output of a cylinder?   If the diameter of…

A: Consider F as the force output, P as the air pressure applied, and A as the piston area or the area…

Q: Q1. In the operation of a screw jack, which has a velocity ratio of 112, an effort of 30 N raises a…

A:

Q: A 4-stroke engine produces a power of 18 kW. The flywheel has a radius of 1.0 m and the density of…

A:

Q: The ram and plunger of a hydraulic press are 150 mm and 25 mm in diameter respectively. With a…

A: Given:D=150 mm =15 cmd=25 mm =2.5 cmSp=30 cmP=1 tonnes

Q: Trina is a gym goer with a leg length of 84 cm. Suppose that she is in the gym doing straight leg…

A: Solution: Given data: L = 84 cm W = 10 lbs

Q: A body of mass 15 kg moving with velocity of 2 m/s is acted upon by a force of 75 N for two seconds.…

A: Given, Mass of the body = m = 15 kg Initial velocity = u = 2 m/s Force applied on body = F = 75 N…

Q: Heavy lifting work is often accomplished by shifting fluids in big machines. The power system of…

A:

Q: To get up on the roof, a person (mass 66.7 kg) places an aluminum ladder (mass 9.30 kg) against the…

A: Given, The mass of the person, mP=66.7 kg The mass of the ladder, mL=9.3 kg All the given dimensions…

Q: What iss the minimum work (in kJ) required to push a 925-kg car 270 m up a slope inclined 8.5° above…

A:

Q: 3 m/s is

A:

Q: A loaded truck weighs 16(10^3)lb and accelerates uniformly on a level road from 15 ft/s to 30 ft/s…

A: Given Data The weight of the truck is: W=16×103 lb The velocity is: 15 ft/s The final velocity is:…

Q: A hollow cylindrical shaft, made of steel, with an outer diameter of = 25 cm and an inner diameter…

A: Givenouter diameter D=25cm=250mminner diameter d=15cm=150mmspeed N=1000rpmτ=60N/mm2

Q: How can you define impulsive force in terms of momentum.

A:

Q: The angle embraced is 175° and the coefficient of friction between the belt and the pulley is 0.25.…

A:

Q: A motor pulls a 1000 kg object up a hill with a 10 degree incline. It starts initially at rest and…

A:

Q: A10-kg box resting on a horizontal surface is pulled by a 5.0 N force. A 3.0 N friction force…

A:

Q: The engineer shown in the figure has a mass of 70 kg, and his bicycle, an aluminum Alubike, weighs…

A: Given: To find: Velocity

Q: Standalone problem with no figure. A motor lifts a 500 kg mass a distance of 20 m in 30 seconds. The…

A: Given values, m=500kg, h=20m t=30 sec, η=0.7 we know, g=9.81 m/s2

Q: The spring-mounted slider with mass m=100g moves in the horizontal guide with dry friction. The…

A: Step 1: Step 2:

Q: 1. A truck hauls a trailer at 60 km/hour when exerting a steady pull of 600 N. If the work is done…

A: As stated in question, Velocity of trailer = v = 60 km/h Force exerted on trailer = F = 600 N Time…

Q: Determine the work done by a 2kgm­ system as it expands slowly within a piston-cylinder arrangement…

A:

Q: uces 10 kW indicated power & mechanical efficiency is 80%. The  friction power is

A: given:indicated power ip=10kwηmech=80%

Q: suming a well-insulated, sealed room determine the internal energy rease after 1 h of operation.

A: Since room is well insulated there will not be any heat transfer across the wall of the room.  Hence…

Clutches, Brakes, Couplings, and Flywheels

The clutch is described as a machine element used to connect or disconnect two shafts together to transmit torque or power. The clutch works on the principles of friction. The clutch is commonly used in automobiles to transfer power from the driving shaft to the driven shaft.