Midterm Review

# Midterm Review - before the block comes to rest(b How long...

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1) A hollow plastic sphere is held below the surface of a freshwater lake by a cord anchored to the bottom of the lake. The sphere has a volume of 0.650m^3 and the tension in the cord is 900N. (a) Calculate the buoyant force exerted by the water on the sphere (b) What is the mass of the sphere? (c) The cord break and the sphere rises to the surface. When the sphere comes to rest, what fraction of its volume will be submerged? 2) A 0.980-kg block slides on a frictionless, horizontal surface with a speed of 1.32 m/s. the block encounters an unstretched spring with a force constant of 245 N/m, as shown in the stretch. (a) how far is the spring compressed

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Unformatted text preview: before the block comes to rest? (b) How long is the block in contact with the spring before it comes to rest? 3) A sting is displaced from its equilibrium position and oscillates as shown below. If the frequency is 440Hz and the string has a length of 2 meters and a mass of 0.4kg, find the tension in the string? 4) Two charges, each equal to 2.90 uC, are placed at two corners of a square 0.500m on a side, as shown in the following sketch. Find the magnitude and direction of the net electric field at the third corner of the square, the point labeled 3 in the sketch....
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Midterm Review - before the block comes to rest(b How long...

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