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A 42.0-kg boy, riding a 2.29-kg skateboard at a velocity of +5.82 m/s across alevel sidewalk, jumps forward to leap over a wall. Just afterleaving contact with the board, the boy's velocity relative to thesidewalk is 5.40 m/s, 9.90° above the horizontal. Ignore any friction between the skateboard and the sidewalk. What is the skateboard's velocity relative to the sidewalk at this instant? Besure to include the correct algebraic sign with your answer.
A uniform disk turns at 3.9 around a frictionless spindle. A nonrotating rod, of the same mass as the disk and length equal to the disk's diameter, is dropped onto the freely spinning disk . They then both turn around the spindle with their centers s..
A particle is in the ground state of an infinite square well. Find the probability of finding the particle in the middle third of the well
Two automobiles, each of mass 900 kg, are moving at the same speed, 15 m/s, when they have an inelastic collision.(a) In what direction and at what velocity does the wreckage move if one car was driving north and one south? (b) In what direction a..
A battery with an emf of 12.0 V shows a terminal voltage of 11.5V when operating in a circuit with two lightbulbs rated at 3.0 W, What is the battery's internal resistance
An elevator is moving upward at a constant speed of 2.50 m/s. A bolt in the elevator ceiling 3.00 mabove the elevator floor works loose and falls. How long does it take for the bolt to fall to the elevator floor
An electric field of 7.90 x10^5 V/m is desired between two parallel plates, each of area 41 cm2 and separated by 2.45 mm of air. What charge should be on each plate.
Integrated circuits are manufactured in vacuum chambers in which the air pressure is 9.00×10?11mm of Hg. What is the mean free path of a molecule
Find the specific gravity of the wood
A ball is tossed from an upper-story window of a building. The ball is given an initial velocity of 8.90 m/s at an angle of 16.0° below the horizontal. Find the height from which the ball was thrown
cobalt-60 with a half-life of 5.27 years is made by exposing a 150 g of cobalt-59 density 8.9 gmcm3 capture
A 0.0400 kg golf ball initially at rest is given aspeed of 35.0 m/s when a club strikes.If the club and ball are in contact for 2.00 ms, what average force acts on the ball
At a tea party, a coffeepot and a teapot are placed upon the serving table. The coffeepot is a shiny silver-plated pot with emissivity of 0.30; the teapot is ceramic and has an emissivity of 0.55. what is the rate of radiative heat loss from the tw..
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