Answers Physics I PretestQuestion 4

4

lesson pretestMultiple Choice

Pretest

Question 4 • Physics I

Which formula can be used to find the tangential speed of an orbiting object?

Answer

A

v is equal to cap g the fraction with numerator m sub c e n t r A l and denominator r

B

v is equal to r the fraction with numerator open paren m sub c e n t r A l close paren and denominator cap g

C

v is equal to the fraction with numerator 2 pi r and denominator cap t

D

v is equal to the fraction with numerator square root of 2 pi r end root and denominator cap t

Explanation

Tangential speed is the distance traveled along one circular orbit divided by the time taken. One orbit covers a circumference of 2πr, and if the orbital period is T, then v = 2πr/T. Choice C gives this formula.

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