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A UFO streaks across the sky at a speed of 0.95c relative to the earth. A person on earth determines the length of the UFO to be 220 m along the direction of its motion. What length does the person measure for the UFO when it lands?
An eastbound subway train accelerates from rest at 1.22 m/s2 along a straight track. How far apart are the trains when the eastbound subway train is traveling at the same speed as the westbound train
A well-thrown ball is caught in a well-padded mitt. If the deceleration of the ball is 2.10×104 m/s2, what was the initial velocity of the ball
A beam contains 4.0 108 doubly charged positive ions per cubic centimeter, all of which are moving north with a speed of 1.3 105 m/s
a metal plate of mass (m=20kg) slides down a slope of height (h=10 meters) and angle (theta=30Â °). what is the magnitude of the work done by friction
An object with a mass of 5.10 kg is attached to the free end of the lightstring wrapped around a reel radius R=0.25 m and mass 3kg the reel is a solid disk, free to rotate in a vertical plane about the horizontal axis paasing through its center th..
A ball is launched from the top edge of a building 32.8 m high at a speed of 23.7 m/s at an angle of 15.0 degrees above the horizontal. Find the horizontal distance from the building at which the ball lands
The rocket fires for 10 mins , after that the asteroid is moving at 30 degrees to its original path at the speed of 18 km/h/ Find its average acceleration.
A rifle with a barrel length of 58 fires an 11 bullet with a horizontal speed of 370. The bullet strikes a block of wood and penetrates to a depth of 15.
Calculate momenta before collision of the objects with masses m1=10g and m2=20g, moving with speeds v1=2m/s and v2=7m/s
The angular momentum of a flywheel having a rotational inertia of 0.250 kg·m2 about its central axis decreases from 2.80 to 1.800 kg·m2/s in 1.00 s. What is the average power of the flywheel
An automobile of mass m = 1100 kg is being towed by a truck whose driver observes that the tension in the rope is T = 3700 N, What is the work done to overcome friction in the car
A certain superconducting magnet in the form of a solenoid of length 0.520 m can generate a magnetic field of 9.10 T in its core when its coils carry a current of 80 A
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