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Physics 2010 Exam 2 Name: You may use any calculator on this exam as long as it does not connect to the internet (no phones, tablets, etc.) You are allowed a 3"x5" note card with whatever you want written on it, front and back. Please show all work where applicable. A correct answer with no work to back it up will be worth half the points. A wrong answer with mostly correct work can be worth more than a correct answer with no work. Be careful with significant figures! 1. (2 pts) You are driving down a straight, level road at 50 mph. You notice that you have to keep the gas pedal pressed partway down to do this (If you take your foot off the gas pedal the car immediately starts to slow). As you continue on your way in your steady motion, which of the following is true of the system of you and the car? a. There is no drag force exerted on the car b. The net external force is not zero c. There are no external forces in the horizontal d. The net external force is zero 2. (2 pts) Suppose we go from Earth to a planet with gravity of a different strength. Which of the following is true? a. Our mass will stay the same but our weight will be different b. Our mass and weight will both be unchanged c. Our mass will change but our weight will be the same d. Both our mass and weight will change 3. (2 pts) You are on a merry go round spinning at 4Tt radians/second. You take a step closer to the center of the merry go round. Which of the following is true? a. Your tangential velocity and angular velocity will both change b. Your tangential velocity and angular velocity will both stay the same c. Your tangential velocity will change but your angular velocity will not d. Your tangential velocity will not change but your angular velocity will