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For a SKF Single-Row 02-80 mm Deep-Groove ball bearing, an axial load Fa of 7650 N and a radial load Fr of 15 kN are applied with the
inner ring stationary. Estimate the bearing life at a speed of 740
rev/min with a reliability of 99.99%. SKF rates its bearings for 1 million
revolutions. The Weibull parameters are, x0 = 0.02, θ = 4.459, and b =
1.483
The motor driving a grindstone is switched off when the latter has a rotational speed of 240 rpm. After 10sec, the speed is 180 rpm. If the angular retardation remains constant, how many additional revolutions does it make before coming to rest?
6.) When an electric motor is turned on at t = 0, its angular acceleration is 𝛼 = 10e-0.5t where t is the time in seconds. What is the terminal angular velocity of the motor in rpm
7.) Referring to problem 6, how many revolutions are required for the motor to reach half of its terminal angular velocity.
(No need to answer no. 6)
When an electric motor is turned on at t = 0, its angular acceleration is 𝛼 = 10e-0.5t where t is the time in seconds. What is the terminal angular velocity of the motor in rpm?
. A ball is dropped from the top of a tower 80m high at the same instant a second ball is thrown vertically upward from the ground. If the two balls meet each other at the point of 44m above the ground, determine the initial velocity of the second ball.
A car travels at 40kph for 2 hrs, at 50 kph for 1 hr and at 20 kph for 0.5 hr, find the average speed of the car.
A river flows due north with a velocity of 3kph. A man rows a boat across the river. His velocity relative to the water is 4kph due east. If the river is 1km wide, how long will it take him to cross the river?
For a SKF Single-Row 02-80 mm Deep-Groove ball bearing, an axial load Fa of 7650 N and a radial load Fr of 15 kN are applied with the
inner ring stationary. Estimate the bearing life at a speed of 740
rev/min with a reliability of 99.99%. SKF rates its bearings for 1 million
revolutions. The Weibull parameters are, x0 = 0.02, θ = 4.459, and b =
1.483
One spring I placed inside the other and compressed between a pair of parallel plates until the distance between the two plates is 40mm calculate the force applied to the spring assembly
A melting point test ofinwant to test the claim that the temperature is different fromx D154:2 F. Assume that the melting point is normally distributed withn D10 samples of a binder used in manufacturing a rocket propellant resulted155 F: Test the hypothesis atD1:5 F: Suppose youD0:05:
