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154-wk-07a

# 154-wk-07a - HPHY 154 Workout 07a Applications of Newton's...

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HPHY 154 Workout 07a Applications of Newton’s Laws of Motion Prof. A. E. Bak Name 1. A sphere of mass 3.00 ! 10 ! 4 kg is suspended from a cord. A steady horizontal breeze pushes the sphere so that the cord makes an angle of 37 " with the vertical, the sphere being at rest. a. Determine the tension in the cord. b. How hard does the breeze push on the sphere? 2. A worker drags a 310- kg crate across a factory floor by pulling on a rope tied to the crate. The worker exerts a force of magnitude 450 N on the rope, which is inclined at 38 " above the horizontal. The floor exerts a frictional force of magnitude 125 N. Calculate the crate’s acceleration. 3. A 100- kg crate is pushed at constant speed up a frictionless ramp inclined at 30.0 " . The pushing force acts parallel to the ramp. a. Find the magnitude of the pushing force. b. Determine the force exerted by the ramp on the crate. 4. S&J Problem 5-22 (formerly S&B Problem 5-32). Draw a simplified free-body diagram for a block that slides down a frictionless plane inclined at ! " 15.0 " . See Figure P 5.22 on page 142. If the block starts from rest at the top and the incline’s length is 2.00 m , then find: a. the block’s acceleration. b. the block’s speed when it reaches the bottom of the incline. 5. A 3.70- kg block, on a frictionless inclined plane of angle 30.0 " , is connected by a light cord over a massless, frictionless pulley to a 2.30- kg block hanging vertically. a. Find the acceleration of each block.

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154-wk-07a - HPHY 154 Workout 07a Applications of Newton's...

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