The rotor of an electric motor has an angular velocity of 3600 rpm when the load and power are cut off. The 120-lb rotor, which has a centroidal radius of gyration of 9 in., then coasts to rest. Knowing that kinetic friction results in a couple of magnitude 2.5 lb·ft exerted on the rotor, determine the number of revolutions that the rotor executes before coming to rest.

Q: The 200-mm-radius brake drum is attached to a larger Bywheel. The total mass moment of inertia of…

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Q: 3. The 10-in.-radius brake drum is attached to a larger flywheel which is not shown. The total mass…

A:

Q: The rotor of an electric motor has a mass of 25 kg, and it is observed that 4.2 min is required for…

A: Given Data: Mass of the rotor is M = 25 kg. The initial angular velocity of the rotor is ωi = 3600…

Q: The double pulley shown has a mass of 15 kg and a centroidal radius of gyration of 160 mm. Cylinder…

A: Let rA be the radius of the outer pulley and rB that of the inner pulley. Write the expression of…

Q: e 10-in.-radius brake drum is attached to a larger flywheel which is not shown. The total mass…

A: given:

Q: t m=5kN-m applied to the lower link at C. Determine the angular velocity and the angular…

A: given:mass of verticlal bar m=150kgm=5kn-m

Q: The 8-in. radius brake drum is attached to a larger flywheel that is not shown. The total mass…

A: The kinetic friction between drum and shoe will be responsible for loss of Kinetic Energy of drum…

Q: Two uniform cylinders, each of mass m = 6 kg and radius r = 125 mm, are connected by a belt as…

A: Given data: The mass of the cylinders is m=6 kg. The radius of the cylinder is r=125 mm. The angular…

Q: A 200-kg flywheel is at rest when a constant 300 N.m couple is applied. After executing 560…

A: Write the expression of the moment of inertia of the flywheel. Write the expression of the initial…

Q: The rotor of an electric motor has an angular velocity of 3600 rpm when the load and power are cut…

A: Given data: Calculate the angular velocity as follows:

Q: The mechanism shown is one of two identical mechanisms attached to the two sides of a 185-lb uniform…

A: Given data :w = 185 lbSpring constant = kT1= 0                             g= 32.2 ft/s2θ= 30°θ2 =…

Q: The flywheel of a steam engine has a radius of gyration of 1m and mass of 2500Kg.The starting torque…

A: Flywheel is a device used in various machines for continuous supply of energy, by storing energy. It…

Q: A driver starts his car with the door on the passenger’s side wide open ( _ θ = 0). The 100-lb door…

A: Given data: The mass of the door is; m = 100 lb. The centroidal radius of gyration of the door is; k…

Q: A four-bladed airplane propeller has a mass of 160 kg and a radius of gyration of 800 mm. Knowing…

A: I=mk2                           where I=mass moment of inertia,m=mass and k=radius of…

Q: A drum of 4-in. radius is attached to a disk of 8-in. radius. The disk and drum have a total weight…

A: Draw the Free Body Diagram for the above problem. Write the expression for linear acceleration and…

Q: The 10-in.-radius brake drum is attached to a larger flywheel which is not shown. The total mass…

A:

Q: 2) A slender uniform 30 kg bar is hinged off center and swings down on a vertical plane. In the…

A:

Q: The 10-in.-radius brake drum is attached to a larger flywheel which is not shown. The total mass…

A:

Q: The 8-in. radius brake drum is attached to a larger flywheel that is not shown. The total mass…

A:

Q: The 4-kg uniform slender bar BD is attached to bar AB and a wheel of negligible mass that rolls on a…

A: Apply the kinematics to the given system. Therefore,

Q: A uniform 75-kg cube is attached to a uniform 70-kg circular shaft as shown, and a couple M with a…

A: Given data To determine the time required for the anglar velocity of the system to increase 1000rpm…

Q: The steel roll shown has a mass of 1200 kg, a centroidal radius of gyration of 150 mm, and is lifted…

A: To find : a) the angular acceleration of the roll  b)  the acceleration of its mass centre . Given :…

Q: A spool with radius R = 3 ft is released from rest on an incline with θ= 30◦, and its center, which…

A: Radius , R=3 ftangle of inclination, θ=30o

Q: The 10-in.-radius brake drum is attached to a larger flywheel which is not shown. The total mass…

A: Given Data Moment of inertia is :I=22 lb·ft·s2 Initial angular velocity is : ω1=255 rpm=26.70 rad/s…

Q: 6. The 8-in.-radius brake drum is attached to a larger flywheel that is not shown. The total mass…

A:

Q: The circular platform A is fitted with a rim of 200-mm inner radius and can rotate freely about the…

A: Given: Radius of rim = 0.2 m Mass of the rim = 5 kg The radius of gyration 0.175 m Mass of the disc…

Q: The brake drum of radius 10 cm is attached is a larger flywheel that is not shown. The total mass…

A: Given: Mass moment of inertia I=50kg.cm2 or 0.005kgm2 N=360rpm µ=0.35 P=40 Solution: We need to…

Q: The rotor of an electric motor has an angular velocity of 3570 rpm when the load and power are cut…

A:

Q: A 6-lb homogeneous disk of radius 3 in. spins as shown at the constant rate w1 = 60 rad/s. The disk…

A: Given: The mass of the disc, m = 6 lb The radius of the disc, r = 3 in The speed of the disc, w1 =…

Q: The steel roll shown has a mass of 1200 kg, a centroidal radius of gyration of 150 mm, and is lifted…

A: Given Data Mass = 1200Kg MOI, I=mk2=1200(0.150m)2=27Kgm2. radius, r=d/2=(0.100)/2=0.050m TA=3100N…

Q: A 40-kg flywheel of radius R = 0.5 m is rigidly attached to a shaft of radius r = 0.05 m that can…

A: Given m=40kgR=0.5mr=0.05mP=150Nk=0.4m

Q: The rotor of an electric motor has an angular velocity of 4500 rpm when the load and power are cut…

A: Given data: -  The speed of the rotor of an electric motor is N = 4500 rpm. The mass of rotor is M…

Conservation of Energy

In physics, the rule of the conservation of energy states that energy doesn’t disappear from the atmosphere; instead, it changes its form from one type to another. Energy is one of the most important physical quantities in nature, and it cannot be created or destroyed — only transformed.