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Unformatted text preview: Classical Mechanics From chapters 17 Work, power, energy • Work = force x distance • Power = work/time • Energy = capacity to do work • Kinetic energy = ½ m.v 2 • Potential Energy = energy due to interactions between bodies • (e.g., gravitational PE = m.g.h) • Workenergy theorem. Work = change in KE • Conservation of Energy Q1 • When the mass of a moving object is doubled, by what factor is its momentum changed ? Its kinetic energy ? Two, Two •When the velocity of a moving object is doubled, by what factor is its momentum changed ? Its kinetic energy ? Two, four Q2 • When an electric company can’t meet it’s customers’ demand for electricity on a hot summer day, should the problem be called an energy crisis or power crisis ? Explain. Power crisis . The demand on energy required per unit time is causing the crisis. Q3 • Why does the force of gravity do no work on (a) a bowling ball rolling along a bowling alley, and (b) a satellite in circular orbit around the earth ? Force ┴ distance Q4 • At what point in its motion is the KE of a pendulum bob maximum ? PE maximum ? • Does the spring that support the bob do any work ? • Does the force of gravity do any work ? • Explain. Illustrate your answer with a cartoon. •The lowest pt •The higest pt •No •Yes, except at the lowest point Q5 • Does the KE of a car change more when it goes from 10 to 20 km/h or when it goes from 20 to 30 km/h (no direction change)? No. Q6 • A car moving at 50 km/h skids 15 m with locked brakes. How far will the car skid with locked brakes at 150 km/h 15 x 9 = 135 m. Q7 • In the hydraulic machine shown, it is observed that when the small piston is pushed by 10 cm, the large piston is raised by 1 cm. If the small piston is pushed with a force of 100 N, what is the most force that the large piston could exert ?...
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This note was uploaded on 04/05/2008 for the course ENG 10 taught by Professor Atulparhak during the Spring '08 term at UC Davis.
 Spring '08
 Atulparhak

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