Estimation: Estimate how many pennies would you have to stack to reach from the floor to an average 8-ft ceiling.

A. 2 × 103
B. 2 × 102
C. 2 × 104
D. 2 × 105
E. 2 × 106


Answer: A

Physics & Space Science

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What is the escape speed from a planet of mass m and radius r if m = 3.2 × 1023 kg and r = 2.4 × 106 m?

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Indicate whether the statement is true or false

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Car A rear ends Car B, which has twice the mass of A, on an icy road at a speed low enough so that the collision is essentially elastic. Car B is stopped at a light when it is struck. Car A has mass m and speed v before the collision. After the collision

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