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Unformatted text preview: Physics 1A Winter 2009: Quiz 3 Version A 1 2.13.09 Closed book. No work needs to be shown for multiple-choice questions. 1 . A Joule is a: a. kg ! m/s 3 b. kg ! m 2 /s c. kg ! m 2 /s 3 d. kg ! m/s e. kg ! m 2 /s 2 <-- 2 . A car with mass M traveling at speed V has kinetic energy KE. What is the kinetic energy of a second car that has half the mass and twice the speed of the first car? a. 0.5 KE b. 2 KE <-- c. 4 KE d. 8 KE e. 0.25 KE 3 . An ideal spring is used to fire a 15.0 gram pellet horizontally. The pellet is initially at rest. The spring has a spring constant of 20 N/m and is initially compressed by 7.0 cm. The kinetic energy of the pellet as it leaves the spring is: a. zero b. .5 ! 10 " J c. 4.9 ! 10 " 2 J <-- d. 9.8 ! 10 " 2 J e. 1.4J 4. A Newton is a: a. kg m/s 3 b. kg/s 2 c. kg m/s d. kg m/s 2 <--- e. kg m 2 /s 2 5 . A 20-N crate starting at rest slides down a rough 5.0-m long ramp, inclined at 25 with the horizontal. 20 J of energy is lost to friction. What will be the speed of the crate at the bottom horizontal....
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- Spring '09