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Work Energy Power Review

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Work is done when 1.the displacement is not zero and a force is parallel to the displacement 2.the displacement is zero. 3.the force is zero. 4.the force and displacement are perpendicular.

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A 75kg man and a 55kg woman perform dives on adjacent diving boards of the same height. Which of them will have a greater kinetic energy entering the water? 1.The man 2.The woman 3.Both will be the same 4.Unable to be determined

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A 75kg man and a 55kg woman perform dives on adjacent diving boards of the same height. Which of them will have a greater speed entering the water? 1.The man 2.The woman 3.Both will be the same 4.Unable to be determined

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Two rescue packages of equal mass are dropped from planes of different altitude - red plane at 1500m and a blue plane at 2500m. Which of them will have a greater speed hitting land? 1.Red planes package 2.Blue planes package 3.Both will be the same 4.Unable to be determined

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If both the mass and the height of a ball are doubled, the potential energy of the ball is increased by a factor of 1.2 2.½ 3.4 4.8 5.16

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If both the mass and the velocity of a ball are tripled, the kinetic energy of the ball is increased by a factor of 1.3. 2.6. 3.9. 4.27.

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Of the following examples, the one that represents work as defined by a scientist is: 1.lifting a book from your desk. 2.leaning on a shovel while others labor. 3.pushing hard against a wall for an hour. 4.carrying a heavy box on your head.

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A machine that does more work than another must have moved the object is a shorter amount of time? 1.True 2.False Answer Now

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In a closed system, what is constant? 1.Potential energy 2.Kinetic energy 3.Mechanical energy 4.All are constant Answer Now

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Which of the following represents the rate that work is being done? 1.Power 2.Kinetic Energy 3.Potential Energy 4.Total Energy

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A rolling wagon has 50 joules of kinetic energy. If the wagons velocity is doubled, the kinetic energy of the wagon: 1.is reduced to 25 joules. 2.is increased to 100 joules. 3.is increased to 200 joules. 4.remains the same.

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A mouse and a raccoon race to the top of a tree for the last morsel of food left before winter. Both arrive at the top at the same time. Which had more power? 1.Mouse 2.Raccoon 3.Same 4.Unable to be determined

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A linebacker pushes against the blocker but the blocker does not move. The work is: 1.Positive 2.Negative 3.Zero 4.Not enough info Answer Now

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When doing a bench press, you gradually lower the bar down to your chest. The work done by gravity is: 1.Positive 2.Negative 3.Zero 4.Not enough info Answer Now

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When doing a bench press, you gradually lower the bar down to your chest. The work done by your arms is: 1.Positive 2.Negative 3.Zero 4.Not enough info Answer Now

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Because your two-year old cousin refuses to move, you pull him along the ground. The work done is: 1.Positive 2.Negative 3.Zero 4.Not enough info Answer Now

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