CHAPTER 7 PHYS195 NOTES (part two)

CHAPTER 7 PHYS195 NOTES (part two) - W or k/K inet ic Ener...

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Work/Kinetic Energy Theorem: { Net Work done on object} = { change in kinetic energy of object} W F = K = 1 / 2 mv 2 2 - 1 / 2 1 2 1 x F v 1 v 2 m W F = F x
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Air Track 2 A cart on an air track is moving at 0.5 m/s when the air is suddenly turned off. The cart comes to rest after traveling 1 m. The experiment is repeated, but now the cart is moving at 1 m/s when the air is turned off. How far does the cart travel before coming to rest?
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Ball 3 When you throw a 0.2 kg ball upwards at 45 degrees, it rises to 6m maximum height above you. Which statements are correct concerning the kinetic energy at the maximum height? A. The kinetic energy is zero A. The kinetic energy is unchanged A. The kinetic energy decreases by half A. The kinetic energy decreases a small amount
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A Falling Object What is the speed of an object after falling a distance H , assuming it starts at rest? W = F . r = mg r cos ( 0 ) = mg H W = H Work/Kinetic Energy Theorem: W = mgH = 1 / 2 mv f 2 - 1/ 2mv i 2 =1/ 2mv f 2 gH v f 2 = 4 r m g g H j j v i = 0 v f
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Ball A ball, initially at rest, is dropped from a place 1.5 m above the floor and is observed to have a velocity v. If instead, the ball is dropped over a table that is 1 m above the floor, the velocity is:. a) 33% of V. b) 50% of V. c) 57% of V. d) 66% of V. e) 71% of V. 5
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Work done by gravity when dropping mass m: W g = F F F r = mg r cos θ = mg y W g = y Depends only on y ! Gravity is a conservative force: work done does not 6 j j m r m g g y θ m
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CHAPTER 7 PHYS195 NOTES (part two) - W or k/K inet ic Ener...

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