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The horizontal rod OA rotates about a vertical shaft according to the relation ? = 10t, where ? and t are expressed in rad/s and seconds, respectively. A 0.5-lb collar B is held by a cord with a breaking strength of 4 lb. Neglecting friction, determine, immediately after the cord breaks,
(a) The relative acceleration of the collar with respect to the rod,
(b) The magnitude of the horizontal force exerted on the collar by the rod.
25-kg ball begins rolling from rest with constant angular acceleration down a hill. how long will it take to make the next complete revolution
Estimate the shear stress if this force is ex- erted on a 0.412 cm -thick pine board that is 13.7 cm wide
A light bulb at point x in the frame of reference O blinks on and off at intervals, ?t = t2 - t1. Use the expressions for the Lorentz transformations to derive the expression for the time dilation relations ?t and ?t'
a point mass, initially at rest, is released at a distance of 1.5e10m from the center of a neutron star whose mass is 3e30 kg. What is the initial acceleration of the point mass
The Millenium Falcon is chased by the Imperial Forces. The ship is moving at a speed of 0.549 c. What is the velocity of the protons in the resting frame when the cannon is shot in the backward direction
On the Apollo 14 mission to the moon, astronaut Alan Sheppard hit a golf ball with a golf club improvised from a tool. How far did it travel
The electric potential energy stored in the capacitor of adefibrillator is 65 J, and the capacitanceis 137 µF. What is the potential difference that exists across the capacitor plates?
1. a pulley of radius 0.3 m is rotating counter-clockwise and is pulling a weight upward. the weight slows the spinning
an object with a mass 2.70kg is executing simple harmonic motion, attached to a spring with spring constant k=280 N/m. What is the frequency of oscillation of the object
A 7200 kg roller coaster train with a speed of 90.0 km/h brakes to a stop at the end of the ride. How many calories of heat are dissipated by the brakes as a result
If 2.45 x 10-4 Joule of work are required to move 29.2 C of charge from one point to another, obtain the electric potential difference between two points
Find the focal length of a concave mirror if an object 12cm from the mirror has a virtual image 2.1 times the object's actual size
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