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A student on a piano stool rotates freely with an angular speed of 2.91 rev/s. The student holds a 1.45-kg mass in each outstretched arm, 0.791 m from the axis of rotation. The combined moment of inertia of the student and the stool, ignoring the two masses, is 5.50 kg m2, a value that remains constant. As the student pulls his arms inward, his angular speed increases to 3.47 rev/s.
a) How far are the masses from the axis of rotation at this time, considering the masses to be points?
b) Calculate the initial kinetic energy of the system.
c) Calculate the final kinetic energy of the system.
A race vehicle accelerates uniformly as it leaves the pit area, going from rest to 330 kilometer per hour in a semi circular arc with a radius of 200 meter. Find the radial acceleration of the car at this time
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Estimate the average force that a baseball pitcher's hand exerts on a 0.145-kg baseball as he throws a 36-m/s pitch
A wall in a house contains a single window. The window consists of a single pane of glass whose area is 0.10 m2 and whose thickness is 7 mm. what is the percentage lost by the window
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A spring hanging from the ceiling has an unstretched length of 80 cm. What is the amplitude of the resulting oscillation
If its mass is 56.0 kg, determine the average power developed by the cheetah during the acceleration phase of its motion. Express your answer in the following units. (a) watts (b) horsepower
a mass is attached to a vertical spring and bobs up and down between points a and b. where is the mass located when its
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The cars stick together and move as a unit after the collision, at an angle of 47.0° north of east and at a speed of 6.36 m/s. Find out the speed of the 3000 kg car before the collision.
A bullet of mass 0.2 kilogram moving horizontally at 450 m/s hits a 3 kilogram block that is at rest on a frictionless table. Find the speed of the block and momentum after impact
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