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

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