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An electron moving perpendicular to a uniform magnetic field of 0.22 T moves in a circle with a speed of 1.5x107 m/s. What is the radius of the circle? (e=1.6x10-19 C, melectron= 9.11x10-31 kg)
A constant force changes the speed of a 76 kilogram sprinter from 3.0 m/s to 4.0 m/s in 0.45 second. Find the magnitude of the acceleration of the sprinter
What is the resistance of the wire in the blanket? Express your answer to two significant figures and include the appropriate units. How much current does the wire carry
After sliding down a snow-covered hill on an inner tube, Ashley is coasting across a level snowfield at a constant velocity of +2.9 m/s. How fast do the two of them slide across the snow
The Fermi energy of copper at 300 K is 7.05 eV. What is the average energy of a conduction electron
Two cars start from rest at a red stop light. When the light turns green, both cars accelerate forward. What is the total time the blue car is moving
find the mass of Earth from the period T and the radius r of the Moon's orbit about the Earth. T=27.3 days and r=3.82E5 km. suppose the Moon orbits the center of Earth rather than the center of mass of the Earth-Moon system.
A 1.6-rm MHz sound wave travels through a pregnant woman's abdomen and is reflected from the fetal heart wall of her unborn baby. The heart wall is moving toward sound receiver as the heart beats.
A hockey puck has a mass of 0.113 kg and is at rest. A hockey player makes a shot, exerting a constant force of 28.0 N on the puck for 0.16 s. With what speed does it head toward the goal
In alpha particle with a kinetic energy of 0.51 MeV approaches a stationary gold nucleus. What is the speed of the alpha particle?
Suppose that a disk rotates through five revolutions in 4 seconds. What is the angular rotational velocity
A 45.5-g golf ball is driven from the tee with an initial speed of 40.3 m/s, determine the kinetic energy of the ball at its highest point
Calculate the firm's earnings per share (EPS). Explain how large a per-share cash dividend did the firm pay on common stock during 2011?
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