SolutionsPracticeExamQuestions - Solutions to Physics 100...

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Solutions to Physics 100 Practice Exam Questions Answer is c. Using kinematics (v f 2 - v i 2 =2ah), one finds the height proportional to the square of the (initial) speed. Thus, doubling the speed quadruples the height.
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Answers: (a), (b), (d)
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Answer: Acceleration is down, and its magnitude is 0.5 m/s 2 . Use F net = n W = ma, where the convention is positive up. Since n = 570 and W = 600 N, a is negative, indicating down. Use total charge = (Number of ions)*(charge of one ion) = current * time. When open: A > D = E > B = C When closed: E > A > B = C > D
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Since all the light bulbs have the same current, to compare the power it is enough to compare the current running through each. When switch is open, no current runs through it. When closed, no current runs through C. Answer: 15 W Use P=I 2 R for each resistor; add their contributions. Same current runs through them. The latter is determined by using the voltage across resistor one, and its resistance. Total current is 3 A. From R 1 and I 1 you can find V 1 . The latter is the same as V 2 . Use V 2 to find I 2 . The total current is the sum of I 1 and I 2 .
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(a) When sled + brother are accelerating, you is still pushing. Thus, as indicated on the right.
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