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

Physics & Space Science

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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

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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

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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.

Physics & Space Science

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.

Physics & Space Science