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Find an angular speed of a skater.
A 60.0 kg skater begins a spin with the angular speed of 6.00 rad/s. By changing the position of her arms, the skater decreases her moment of inertia by 50%. What is the skater's final angular speed?
A 0.5 kg air puck moves to the right at 3 m/s, colliding with a 1.5 kg air puck that is moving to the left at 1.5 m/s 1) Determine the direction and speed of the pucks' motion if they stick to each other after the coll ...
You measure the length of the same side of a block five times and find: b=12.0, 11.7, 12.2, 11.9 and 11.8 mm. What is the best estimate for the uncertainty in b? The amount of average 11.92 is wrong.
1. An oil bath maintained at 50.5°C loses heat to its surroundings at the rate of 4.68 kJ/min. Its temperature is maintained by an electrically heated coil with a resistance of 60 S2 operated from a 110 V line. A thermor ...
A drag force on a falling object in air is directly proportional to the square of its velocity. After falling some known distance, the kinetic energy of an object becomes K. After falling the same distance what will be t ...
A student travels 300m towards North and then 400m towards East to reach his school. Calculate the distance of his school from his home.
A 2.00 m long horizontal uniform beam of mass 20.0 kg is supported by a wire as shown in the figure. The wire makes an angle of 20.0 degrees with the beam. Attached to the beam 1.40 m from the wall is a ball with a mass ...
An aircraft with a mass 315 kg is accelerated at 8.3 m/s2for 5 seconds, at which time the aircraft launches. Assume the acceleration is constant. What is the force required to launch the aircraft?
Consider the Stop-and-Wait protocol as described in the chapter. Suppose that the protocol is modified so that each time a frame is found in error at either the sender or receiver, the last transmitted frame is immediate ...
A 5.4-µC point charge is located at x = 0.9 m, y = 3.2 m, and a -3.9-µC point charge is located at x = 1.9 m, y = -2.3 m. (a) Find the magnitude and direction of the electric field at x = -3.2 m, y = 1.1 m. magnitude: __ ...
You find a 30 N box on the middle of a set of stairs and carry the box up a flight of stairs to a deck, raising its elevation by 5 m. Then you drop the box off of the deck. As the box reaches its original level (the box ...
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