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In a skating stunt known as crack-the-whip, a number of skaters hold hands and form a straight line. They try to skate so that the line rotates about the skater at one end, who acts as the pivot. The skater farthest out has a mass of 80.0 kg and is 6.20 m from the pivot. He is skating at a speed of 7.20 m/s. Determine the magnitude of the centripetal force that acts on him.
A world class sprinter accelerates to his maximum speed in 3.80 s. He then maintains this speed for the remainder of a 100 m race, finishing with a total time of 10.30 s. What is the runner's average acceleration throughout the first 3.80 s.
The rms current in an ac circuit with a resistance of 140 is 0.88 A. What is the average power consumed by this circuit
A skier is gliding along at 3.6 m/s on horizontal, frictionless snow. He suddenly starts down a 10 degree incline. His speed at the bottom is 17 m/s .
blocks are lined up in a row on a frictionless table. How much force does the 8.0 block exert on the 7 block.
An airplane needs to reach a velocity of 407 km/h to take off. On a 2000m runway, what is the least acceleration necessary for the plane to take flight.
In a primary coil the current is initially 3.4 A. After a time of 0.14s, the current will change to 1.6A. What is the mutual inductance of the coils
You are designing a machine for a space exploration vehicle. It contains an enclosed column of oil that is 1.05m tall, What must be the density of the oil
Consider a planet that, given its albedo and distance from the sun, should have a surface temperature of 110 K, but instead has a surface temperature of 130 K because it has an internal source of heat. How much more energy is the planet emitting than..
A charge of 6.22 mC is placed at each corner of a square 0.170 m on a side. Determine the magnitude of the force on each side
A 0.218 kg ball is released from rest at the top of a 56.9 m tall building. Calculate the de Broglie wavelength of the ball
A 52-kg mountain climber, starting from rest climbs a vertical distance of 730m. At the top, she is again at rest. Find her efficiency as a heat engine
A 5.78 cm long rod in the shape of a rectangular solid has cross section dimensions 28.7 mm x 42.6 mm. What is the current in the block
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