How do we calculate centripetal acceleration?
a. By calculating the acceleration at several points around the circle and averaging.
b. By subtracting two velocity vectors separated by a short time interval.
c. By adding two velocity vectors separated by a short time interval.
d. By calculating the change in speed.
e. By calculating the acceleration at several points around the circle and finding the sum.
b
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Olber's Paradox is solved in part by the fact that the universe is neither infinitely large nor infinitely old
Indicate whether the statement is true or false
According to the principle of equivalence, acceleration is equivalent to
A) velocity. B) net force. C) gravity. D) the state of free-fall. E) energy.
Andrea and Chuck are riding on a merry-go-round. Andrea rides on a horse at the outer rim of the circular platform, twice as far from the center of the circular platform as Chuck, who rides on an inner horse. When the merry-go-round is rotating at a constant angular speed, Andrea's tangential speed is
1.twice Chuck's. 2.the same as Chuck's. 3.half of Chuck's. 4.impossible to determine.
Which of the following is not a method astronomers use to determine the physical conditions inside the Sun?
A) detecting solar neutrinos generated in the Sun's core B) measuring Doppler shifts to observe solar vibrations C) observing X-ray images of the solar interior using satellites D) building mathematical models that use the laws of physics E) both C and D