Gluons
a. are carriers of the color force
b. posses color charge
c. can interact with each other via the color force
d. can form glueballs
e. all of the above
E
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A 100 W lightbulb has an energy efficiency of 5%. It is turned on for one minute. During this time, the visible radiant energy output of the lightbulb is
A) 300 J. B) 6000 J. C) 5700 J. D) impossible to determine because we don't know the voltage. E) impossible to determine because we don't know the power.
Two in-phase loudspeakers are placed along a wall and are separated by a distance of 4.00 m. They emit sound with a frequency of 514 Hz
A person is standing away from the wall, in front of one of the loudspeakers. What is the closest nonzero distance from the wall the person can stand and hear constructive interference? The speed of sound in air is 343 m/s. A) 0.34 m B) 0.73 m C) 1.2 m D) 1.6 m
The small circles in the diagram below represent the positions along the x axis of a body at equal time intervals. Assume the body moves in a straight line
This diagram is most likely to describe
a.
a swimmer swimming laps.
b.
an exercise on a rowing machine.
c.
a person on a treadmill.
d.
a tennis ball during a volley.
e.
a runner who tripped, fell, rose, and continued racing.
An object placed at a distance farther from a converging lens than the focal point always produces an image that is
A. The same size as the object B. Inverted C. Virtual D. Smaller than the object