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mec104 exam1

# mec104 exam1 - A car passes by heading to your left with a...

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1. A car passes by, heading to your left, with a speed of 2 m/s. You reach out and push it toward the left with a force of 50 N. The moving car pushes on you with a force of A) 0N B) 48N C) 50N D) 52N 2. A sprinter can go from zero to 10 m/s in one second. If his acceleration is constant during that time his/her acceleration is A) 10 B) 0 C) 9.8 m/s D) 10 m/s^2 3. When out climb out on a thin tree limb, there’s a chance that the limb will break off near the trunk. This disaster is most likely to occur when you’re as far out as the limb as possible because 4. While a gymnast is in the air during a leap which of the following quantities must remain constant for her. Angular momentum – there are no torques. 5. Who came first? A) Galileo (1546-1642) B) Newton (1642-1727) C) Einstein (1879-1955) 6. The earth exerts a downward force of 850N on a veteran astronaut as he works outside the space shuttle. What force does the astronaut exert on the earth? 7. When the brakes on her truck fail, the Driver steers it up a runaway truck ramp. As the truck rolls up the ramp, it slows to a Stop, most of the truck’s kinetic energy is converted to A) Momentum B) Gravitational potential energy C) Angular momentum D) Force 8. If you pull down on the basket of a hanging gravity store scale so that it reads 20N, how much downward force are you exerting on the basket?

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9. Federal standards for weights and measures are set by the
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