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A student sits on a rotating stool holding two weights, each of mass 3.00 kg. When his arms are extended horizontally, the weights are 0.700 m from the axis of rotation and he rotates with an angular speed of 0.850 rad/s. The moment of inertia of the student plus stool is 3.00 kg·m2 and is assumed to be constant. The student pulls the weights horizontally to 0.300 m from the rotation axis.
(a) Find the new angular speed of the student.
(b) Find the kinetic energy of the student before the weights are pulled in. Find the kinetic energy of the student after the weights are pulled in.
In the circuit of a radio receiver a 540 ?F capacitor is connected in series with a 12.0 mH inductor and a resistance of 2.60 ?. Does the voltage lead or lag the current
A bicycle tire of radius 0.38 m has a piece of gum stuck on its rim. What is the angle through which the tire rotates
A 92-kg fullback, running at 5.0 m/s, attempts to dive directly across the goal line for a touchdown. What is the velocity of the football players after the collision
A small immersion heater is rated at 329 W. Compute approximately how long it would take to heat a cup of soup (suppose this is 250 mL of water) from 20°C to 50°C.
Two stars in a binary system orbit around their center of mass. The centers of the two stars are 7.11x10^11 m apart. What is the mass of the smaller star
Find out the rotational inertia of this object (a) about an axis through the center of the triangle and perpendicular to its plane (b) and about an axis that passes through one vertex and the midpoint of the opposite side.
A parallel-plate capacitor with circular plates of radius R is being discharged. What is the discharging current
As seen from the window of a space station, a 99.0 kg satellite sailing along at 9.4 m/s collides head-on with a small 286.0 kg asteroid, What is the final velocity of the satellite
When two lenses are used in combination, the first one forms an image that then serves as the object for the second lens. Find the location and height of the image
Two narrow, parallel slits separated by 0.200 mm are illuminated by green light (? = 546.1 nm). Calculate the distance between the first and second dark bands
q1. a 240 g block hangs from a spring with spring constant 8.0cm. at the block is 23cm below the equilibrium point and
For safety in climbing, a mountaineer uses a nylon rope that is 60 m long and 1.0 cm in diameter. Find its Young's modulus
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