# C8 - From last time How hard do you have to throw a rock to...

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How hard do you have to throw a rock to hit the moon? Neglect air resistance. From last time. ..

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C8: Force and Energy
A pendulum with string length 0.25 m and a bob of mass 0.1 kg is released from rest an angle of 30 degrees from vertical. How fast is the bob moving at the bottom of the swing? Neglect the mass of the string. Neglect air resistance.

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A block of mass 0.5 kg starts from rest, and then is pushed up a 25° incline by a constant horizontal force of 5.5 N. In addition, there is a constant frictional force of 1.2 N acting on the block. How fast is the block moving after it has travelled a distance of 0.75 m? 25° 5.5 N 0.5 kg

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## This note was uploaded on 03/01/2012 for the course PHY 9HA taught by Professor Markusluty during the Fall '10 term at UC Davis.

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C8 - From last time How hard do you have to throw a rock to...

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