Activity13ConservationofEnergyMar4

Activity13ConservationofEnergyMar4 - What is the tension in...

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Activity 13: Conservation of Energy and Work by non-conservative Forces March 4, 2008 A small toy skydiver, weighing 50N, sinks 1.5 m into the snow when its parachute does not open. The magnitude of the average force of the snow on the person while it is sinking into the snow is 300N. Draw a motion diagram of her motion from when she hits the snow until she stops. What is the direction of the acceleration? Force? Determine the work done by the snow in stopping the person. Determine the work done by gravity. What is the net work? What was the skydiver's speed just before hitting the snow? Determine the work done by the rope on the 1.0kg pendulum bob (which weighs 10N) as the pendulum bob swings down from its starting position to directly below the rope support. Go to: Active Physics to check your work 5.1 A 60 kg elevator is moving up at a speed of 3 m/s and slows to a stop in a distance of 4.0 meters. Draw a FBD on the elevator. Which forces are conservative? Which are non-conservative?
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Unformatted text preview: What is the tension in the cable connected to the elevator? K initial Ug initital W nc done (is it + or -)? K final Ug final K initial Ug initital Us initial W nc done (is it + or -)? K final Ug final Us final K initial Ug initital Us initial W done (is it + or -)? K final Ug final Us final A 200-kg ski cart starts against a compressed spring. When the spring is released, it launches the cart up the 30 hill so that the cart stops about 50 m from its starting position. The spring is initially compressed 10 m. Determine the force constant of the spring needed to achieve this goal. (use g = 10 m/s 2 ). Hill is frictionless. a. Fill in the Work-Energy table b. Use the table above to solve for the force constant of the spring. c. Do the same problem with the same spring, but on a surface with friction ( = 0.2). How far up the slope does the ski sled go?...
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Activity13ConservationofEnergyMar4 - What is the tension in...

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