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An object of 30 kg mass is pulled with a force 1.2 * 10^2 N at angle ?=30 degree over the distance 5 meter.If the coefficient of friction is 0.2, what is workdone by the force of friction?
Suppose that an ion source in a mass spectrometer produces doubly ionized gold ions (Au^2+), each with a mass of 3.27 x 10^-25 kg. Determine the radius of the path
Transverse waves with a speed of 53.5 m/s are to be produced on a stretched string. A 4.35-m length of string with a total mass of 0.0600 kg is used. What is the required tension in the string
3 an observer in spaceship B obverses another spaceship A travelling with a velocity of 0.40 c relative to him. Both are moving in the +x-direction, how much time it takes the missile to reach you
A 0.5 kg brick is dropped from a height of 9.0 m. It hits the ground and comes to rest. What is the magnitude of the impulse exerted by the ground on the brick
As part of a carnival game, a 0.503-kg ball is thrown at a stack of 19.3-cm tall, 0.423-kg objects and hits with a perfectly horizontal velocity of 10.6 m/s, what is the moment of inertia of the object
A ball is thrown upward from the ground with an initial speed of 23.90 m/s; at = same instant, a ball is dropped from a building 16 m high. After how long will the balls be at the same height.
Two people are carrying a uniform wooden board that is 3.00 m long and weights 160 N. at what point does the other person lift
a charge q= 8 uC is moving along the x axis with a velocity of v=4 x 10^4 m/s. a magnetic field of magnitude B=3T is along the y-axis. a) find the magnitude and direction of the net force acting on the charged particle.
A curve in a highway has radius of curvature 130 m and is banked at 3.5°. On a day when the road is icy, what is the safest speed to go around the curve
A 1.0- kg mass is attached to a string wrapped around a shaft of negligible mass and having a 7.0- cm radius. How far apart are the masses of the dumbbell
A 13 g bullet traveling 215m/s penetrates a 2 kg block of wood and emerges cleanly at 157m/s. If the block is stationary on a frictionless surface when hit, how fast does it move after bullet emerges.
Football players measure their acceleration by seeing how fast they can sprint 40 yards (37m). For an 76kg player, what is the average power output for this sprint
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