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A 42.0-kg boy, riding a 1.50-kg skateboard at a velocity of 5.50m/s across a level sidewalk, jumps forward to leap over a wall.Just after leaving contact with the board, the boy's velocityrelative to the sidewalk is 6.00 m/s, 8.30° above thehorizontal. Ignore any friction between the skateboard and the sidewalk. What is the skateboard's velocity relative to theside walk at this instant? Be sure to include the correct algebraicsign with your answer.
A sound wave with intensity 23 mW/m2 interferes constructively with a sound wave that has an intensity of 16 mW/m2. What is the intensity of the superposition of the two
For each part of the following, state any assumptions used and show mathmatical dereviation before using values. determine the rotential inertia of a yo-yo about it's center
A 6 kg box is being pulled by a force F = 95 N at an angle of 54° from the horizontal. calculate the Work done by the external force
A 1.9x10^14 Hz electromagnetic wave propagates in carbon tetrachloride with a speed of 2.05x10^8 m/s
A coin is tossed upward with an initial speed of 7.5 m/s2, What is the total time it is in the air before returning yo it's releasing point
A 72.0-kg log falls from a height of 20.0 m into a lake. find the change in entropy of the air during this process
The gravitational potential energy of all the water stored behind avery large dam is 1.2×1016 J, using the base of the damas the reference point for zero PE. Imagine you could store the same amount of potential energy in a system consisting oftwo ..
A jet transport has a weight of 2.43 x 106 N and is at rest on the runway. The two rear wheels are 16.0 m behind the front wheel, and the plane's center of gravity is 12.4 m behind the front wheel. Determine the normal force exerted by the ground on ..
A ball is thrown up with a velocity of 8 m/s and allowed to fall back down. how long will the ball take to return to its initial position
Calculate charges, current, potential difference.
q1. a 22 kg girl slides down a playground slide that is 8.50 m high. when she reaches the bottom of the slide her speed
An electric field in some region goes as E=15x^2 i N/C. Determine the charge in potential as you move from the orgin to point (2,2,9) m
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