A very light cart holding a 100-N box is moved at constant velocity across a 10-m level surface. What is the net work done in the process?
a. zero
b. 1/10 J
c. 10 J
d. 100 J
e. 1 000 J
a
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Which of the following is not true?
1.If the average velocity of a particle over some interval is equal to zero, the instantaneous velocity of the particle over that interval may not be equal to zero at any time during the interval. 2.The instantaneous velocity of a particle can be less than its average velocity. 3.The instantaneous velocity of a particle can be greater than its average velocity. 4.If the average velocity of a particle over some interval is equal to zero, the instantaneous velocity of the particle over that interval must be equal to zero at some time during the interval.
Successive bright fringes in an interference pattern result from
A) equal-length distances from the slits. B) distance from the slits successively increasing one wavelength at a time. C) destructive interference. D) none of the above
The distinguishing feature of a starburst galaxy is ________
A) strong radio emission from "lobes" of material well outside the visible boundaries of the galaxy B) a very large luminosity compared to the total luminosity of the Milky Way C) a rate of star formation that may be 100 or more times greater than that in the Milky Way D) the presence of an unusually large number of binary star systems containing X-ray bursters
Three resistors, 10 ?, 20 ?, and 30 ?, are wired in parallel and connected to a 12-V battery. How much current flows in the circuit?