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A 45.0 kilogram boy, riding a 2.10 kilogram skateboard at a velocity of 5.60 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.00 m/s, 8.80 degree above the horizontal. Ignore any friction between the skateboard and the side walk. Find the skateboard's velocity relative to the sidewalk at this instant? Be sure to include the correct algebraic sign with your answer.
two crates, of mass m1 = 71kg and m2 = 133kg , are in contact and at rest on a horizontal surface. Force F = 610N is exerted on the 71-kg crate. Determine the acceleration of the system
a body of mass 3kg with an initial velocity of 2 ms makes an elastic collision with another body m2 2kg at rest.finda.
A block with mass M attached to a horizontal spring with force constant k is moving with simple harmonic motion having amplitude A1. What should be the value of the putty mass m so that the amplitude after the collision is one-half the original ampl..
A 4x 11 swimming pool slopes linearly from a 1.20 depth at one end to a 3.80 depth at the other. What is the mass of water in the pool.
two 13.0 cm -diameter electrodes 0.53 cm apart form a parallel-plate capacitor. the electrodes are attached by metal
An unknown resistor is connected between the terminals of a 7.50 V battery. Energy is dissipated in the resistor at the rate of 0.510 W. At what rate is energy now dissipated
A wheel has a constant angular acceleration (deceleration) of 5.0 rad/s^2. the wheel was initially moving at 15.0 rad/s, How many revolution will the wheel make in 4.0 s
Two identical 0.13 kg blocks (labeled 1 and 2) are initially at rest on a nearly frictionless surface, connected by an unstretched spring, How far did the center of mass of the real system move
A transformer has 400 turns in the primary, which is connected to 120V rms. How many turns are needed for each part of the secondary coil
A wave with a frequency of 1200 Hz propagates along a wire that is under a tension of 800 N. What will be the wavelength if the tension is decreased to 600 N and the frequency is kept constant
A flywheel rotates with an angular speed of 23rev/s. As it is brought to rest with a constant acceleration, it turns 45rev. How much time does it take to stop
On her way to school, a child discovered that her coin is missing and there is a hole in her pocket. She turned back and walked 24m east along the sidewalk. find her average velocity while searching for the coin
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