A ball vibrates back and forth from the free end of an ideal spring having a spring constant of 20 N/m. If the amplitude of this motion is 0.30 m, what is the kinetic energy of the ball when it is 0.30 m from its equilibrium position?
A) 0.00 J
B) 0.22 J
C) 0.45 J
D) 0.90 J
E) 1.4 J
A
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On a cosmic calendar, in which the history of the universe is compressed into 1 year, when did Kepler and Galileo first discover that we live on a planet in a solar system?
A) 1 second ago B) 1 day ago C) 1 week ago D) December 25 E) December 30
Car A is traveling at 22.0 m/s and car B at 29.0 m/s. Car A is 300 m behind car B when the driver of car A accelerates his car with an acceleration of 2.40 m/s2. How long does it take car A to overtake car B?
A) 5.50 s B) 12.6 s C) 19.0 s D) 316 s E) Car A never overtakes car B.
In what kind of path would the planets move if no force acted on them?
A) Parabolas, like a thrown rock. B) Straight line with an acceleration of 10 m/sec2. C) Straight line with no acceleration. D) Larger elliptical orbits. E) They would continue in their present orbits, since they already have no force on them.
Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that
a. Y has a negative charge. b. Z has a negative charge. c. Y has a positive charge. d. Z has a positive charge. e. Z is neutral (has no net charge.)