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Newton's second law could be stated either as , or as force equals time rate of change of linear momentum. For simple rotational motion the corresponding law is stated as , or torque equals time rate of change of angular momentum. Momentum is conserved when there is no external force. Angular momentum is conserved when there is no external torque. To test this, sit on a rotating stool with your hands in by your sides. While rotating, extend your arms away from your body. Repeat while holding masses in your hands. Describe the effects. Give an explanation.
A flight attendant pulls her 75 N flight bag a distance of 305 m along a level airport floor at a constant velocity. Find the work done by the force of friction on the flight bag
A car moving with an initial speed v collides with a second stationary car that is one-half as massive. Find the final speed of the second car
A 3.1-cm-diameter parallel-plate capacitor has a 2.2mmspacing. The electric field strength inside the capacitor is 1.3×105V/m. What is the potential difference across the capacitor
A 118-g ball is traveling to the left with a speed of 26 m/s when it is struck by a racket. find the speed of the ball immediately after it leaves the racket
What is the approximate mass of an object whose weight equals the force in part (b).
A disk of radius R = 9 cm is pulled along a friction less surface with a force of F = 15 N by a string wrapped around the edge. At the instant when d = 28 cm of string has unwound off the disk, what is torque exerted about the center of the disk.
A solid spherical conductor of radius 15 cm has a charge Q = 6.5 nC on it. How much charge is there on the second sphere after the two spheres have been separated
How many electrons are transferred. What is the smallest thickness of a soap film that would appear black if illuminated with 490 light? imagine there is air on both sides of the soap film.
In the All-Alaska ice Floe Softball finals, the right fielder for the Nome IceSox (who is floating on a small chunk of ice in still water) makes an outstanding catch of a line drive. what is the final heading of the fielder just after the ball is c..
Two skaters, A and B, of equal mass are moving in clockwise uniform circular motion on the ice. What is the ratio of speeds of the skaters
Ball 1, with mass of 100g and traveling at 10 m/s, collides head-onwith ball 2, which has a mass of 300g and is initially at rest. What is the final velocity of each ball
When the displacement of a mass on a spring is 0.689 of the amplitude of its oscillation, what fraction of the mass's energy is kinetic energy
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