Notes 2-27-10

Notes 2-27-10 - 1. A beastly horse is capable of lifting a...

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Unformatted text preview: 1. A beastly horse is capable of lifting a 80 kg object from the ground to a vertical height of 15 meters in 5.0 seconds. How much power (in Watts and hp) does the horse produce for this scenario? (1 hp = 746 Watts) 1 A 55­kg box is being pushed a distance of 7.0 m across the classroom floor by a force F whose magnitude is 150 N. The force F parallel to the displacement of the box. The coefficient of kinetic friction (µ) is 0.25. a) Draw a free body diagram for the box. b) Determine the work done on the box by each of the four forces that act on the box. Be sure to use the proper sign (+ or ­) for the work done by each force. 2 A bullet is fired at a ballistic pendulum. The mass of the bullet is 0.05 kg. The mass of the block (pendulum) is 1.2 kg. Determine the initial velocity of the bullet (i.e. the velocity it has before it strikes the block) if the pendulum swings to a vertical height of 25 cm. Assume that the bullet becomes embedded in the block after the collision. 3 In the figure below, block 1 of mass = 1.0 kg slides from rest down a frictionless ramp from a height h = 2.50 meters and then collides with stationary block 2, which has a mass of 2.0 kg. After the collision, blocks 1 and 2 slide together (this is a totally inelastic collision) into a region where the coefficient of kinetic friction (µk) is 0.5 and come to a stop in a distance d within that region. What is the value of d? 4 ...
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This document was uploaded on 01/30/2011.

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