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A physics student is standing on an initially motionless,frictionless turntable with rotational inertia 0.31kg·m2. He's holding a wheel of rotational inertia0.22 kg·m2 spining at 135 rpm about a vertical axis. When he turns the wheel upside down, student and turntable begin rotating at 62 rpm.
a) What is the student's mass, considering him to be a cylinder 30 cm in diameter?b) How muchwork did he do in turning the wheel upside down? Neglect the distance between the axes of the turntable and wheel.
An oscillating block - spring system has a mechanical energy of 1.70 J, and amplitude of 10.0 cm, and a maximum speed of 1.1 m/s. A) Find the spring constant. B)Find the mass of the block. C) Find the frequency of oscillation. (three questions)
a ball is thrown straight up in the air with a velocity of 40 ms. what is the speed of the ball right before it hits
A small wooden block with mass 0.850 kg is suspended from the lower end of a light cord that is 1.54 m long. The block is initially at rest. What is the initial speed of the bullet
A crate of mass 12.5 kg is pulled up a rough incline with an initial speed of 1.50 m/s. The pulling force is 100 N parallel to the incline, How much mechanical energy is lost due to friction
A potter's wheel having a radius 0.45 m and a moment of inertia of 11.4 kg · m2 is rotating freely at 48 rev/min. The potter can stop the wheel in 8.0 s by pressing a wet rag against the rim and exerting a radially inward force of 74 N. Find the effe..
The plane of a 5.10cm by 9.00cm rectangular loop of wire is parallel to a 0.220T magnetic field, What is the magnetic moment of the loop
A girl is using a rope to pull a box that weighs 300 N across a level surface with constant velocity. What is the friction force of the floor on the box
a woman on a bridge 107 m high sees a raft floating at a constant speed on the river below. she drops a stone from rest
A world-class sprinter accelerates to his maximum speed in 4.2s . He then maintains this speed for the remainder of a 100-{\rm m} race, What is the runner's average acceleration during the first 4.2s
Two very long wires carrying a current I of 3.0 A out of the pageare at two of the corners of an equilateral triangle. The sides ofthe triangle are 1.0 m long. Find the direction and magnitude of the magnetic field at P, the third corner of the trian..
A model-train car of mass 275 gtraveling with a speed of 0.50 m/s links up with another car ofmass 410 g that is initially at rest. What is the speed of the cars immediately after they have linked together? Find the initial kinetic energy.
two charges are placed between the plates of a parallel plate capacitor. one charge is q1 and the other is q2 7.21c.
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