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A potter's wheel having a radius 0.48 m and a moment of inertia of 10.4 kg · m2 is rotating freely at 48 rev/min. The potter can stop the wheel in 4.5 s by pressing a wet rag against the rim and exerting a radially inward force of 65 N. Find the effective coefficient of kinetic friction between the wheel and the wet rag.
A 15 kg block is accelerated at 2.0 m/s2 up a frictionless plane inclined at 5.0° to the horizontal, with the speed increasing from 10 m/s to 24 m/s. What is the change in the block's mechanical energy
A spaceship is 1600 m long when it is at rest. When it is traveling at a certain constant speed its length is measured by external observers and it is found to be 1370 m. find the speed of the spaceship in terms of the speed of light
Estimate how much the density of water changes between surface water and deep ocean water on the OR coast, assuming that only temperature changes. Apply reasonable estimates (+- 2 degrees Celsius) for the surface and deep water temperature, using val..
A child ties a rock to a string and whirls it around in a horizontal circle. find the period of its uniform circular motion
A 210-kg load is hung on a wire of length of 4.80 m, cross-sectional area 2.00 10-5 m2, and Young's modulus 8.00 1010 N/m2. What is its increase in length
An electric field of 300 V/m is confined to a circular area d = 11.1 cm in diameter and directed outward perpendicular to the plane of the figure. If the field is increasing at the rate of 22.0 V/m·s, what are direction and magnitude of the magnet..
A loudspeaker diaphragm is oscillating in simple harmonic motion with a frequency of 950 Hz and a maximum displacement of 0.65 mm. What is the magnitude of the maximum acceleration
A single-turn current loop, carrying a current of 4.41 A, is in the shape of a right triangle with sides 42.1, 94.5, and 103 cm. What is the magnitude of the net force on the loop
A 1000-kg cart is rolling to the right at 5m/s. A 75-kg man is standing on the right end of the cart. What is the speed of the cart if the man suddenly starts running to the left with a speed of 10.00m/s relative to the cart.
A jumper in the long-jump goes into the jump with a speed of 12m/s at an angle of 20 deg above the horizontal. How long is the jumper in the air
A small 0.280-kg object moves on a frictionless horizontal table in a circular path of radius 4.30 m. The angular speed is 8.02 rad/s.what is the radius of the smallest possible circle on which the object can move
A rock is thrown vertically upward with a speed of 19.0m/s from the roof of a building that is 70.0m above the ground. What is the speed of the rock just before it strikes the ground
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