CHAPTER 8 PHYS195 NOTES (part one)

CHAPTER 8 PHYS195 NOTES (part one) - CHAPTER EIGHT NOTES...

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CHAPTER EIGHT NOTES Physics 195 Lecture (part two)
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Power v F dt r d F r d F dt d dt dW P = = = = ) ( P = E t = dE dt Units of power: J/sec = Nm/sec = Watts 1 hp = 746 W Or…the speed in which energy is transformed is also power. P = d W d t Power is the “rate of doing work”: If the force does not depend on time:
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Elevator An elevator (A) lifts a maximum of 1000 kg to the 5th floor (20m) in 20 sec. A similar elevator (B) lifts a maximum of 2000 kg the same distance in 30 sec. Which elevator has the greater power? A. A A. B A. Both the same A. Insufficient information
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Ball Two cannonballs are dropped from a second floor physics lab at height h above the ground. Ball B has four times the mass of ball A. When the balls pass the bottom of a first floor window at height above the ground, the relation between their kinetic energies, and is a. K A =4K B b. K A =2K B c. K A =K B d. K B =2K A e. K B =4K A
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Skier A skier weighing 800 N comes down a
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CHAPTER 8 PHYS195 NOTES (part one) - CHAPTER EIGHT NOTES...

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