On the planet Jupiter, a dropped object picks up a speed of 20 m/sec in one second. How fast will it be going at the end of 3 seconds of fall, neglecting "air" resistance on Jupiter?
A) 40 m/sec B) 80 m/sec C) 60 m/sec D) 180 m/sec E) 20 m/sec
C
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What might you find at the center of the Milky Way?
A. a region 10,000 light-years across containing no stars B. a black hole with the mass of a few million Suns C. the first stars that formed in the galaxy D. a 10,000 solar mass star whose luminosity is 100 million solar luminosities
Which has a greater luminosity, a star with absolute magnitude +4 or a star with absolute magnitude -6? By how much is it brighter?
What will be an ideal response?
A man in a gym is holding an 8.0-kg weight at arm's length, a distance of 0.55 m from his shoulder joint. What is the torque about his shoulder joint due to the weight if his arm is horizontal?
A) 0.24 N ? m B) 4.4 N ? m C) 43 N ? m D) 15 N ? m E) 0 N ? m
An object is placed 60 cm in front of a mirror and the image is upright and 1?4 the size of the object. What is the focal length of the mirror?
A. -12 cm B. -20 cm C. -45 cm D. -75 cm E. some positive value not given