The voltage and power ratings of a particular light bulb, which are its normal operating values, are 110 V and 60 W
Assume the resistance of the filament of the bulb is constant and is independent of operating conditions. If the light bulb is operated with a current that is 50% of the current rating of the bulb, what is the actual power drawn by the bulb?
A) 15 W B) 10 W C) 30 W D) 20 W E) 25 W
A
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Liquid metallic hydrogen is found in the interior(s) of
a. Jupiter. b. Saturn. c. Jupiter and Saturn. d. neither Jupiter nor Saturn.
Suppose you are playing hockey on a new-age ice surface for which there is no friction between the ice and the hockey puck. You wind up and hit the puck as hard as you can. After the puck loses contact with your stick, the puck will
A) start to slow down. B) speed up a little, and then move at a constant speed. C) not slow down or speed up. D) speed up a little, and then slow down.
A concave spherical mirror has a focal length of magnitude 20 cm. An object is placed 10 cm in front of the mirror on the mirror's axis. Where is the image located?
A) 20 cm behind the mirror B) 20 cm in front of the mirror C) 6.7 cm behind the mirror D) 6.7 cm in front of the mirror
Abby throws a ball straight up and times it. She sees that the ball goes by the top of a flagpole after 0.50 s and reaches the level of the top of the pole after a total elapsed time of 4.1 s
What was the speed of the ball at launch? Neglect air resistance. A) 11 m/s B) 23 m/s C) 34 m/s D) 45 m/s E) 48 m/s