2) A car is rounding an unbanked circular turn with a speed of v = 25 m/s. The r

Question

2) A car is rounding an unbanked circular turn with a speed of v = 25 m/s. The radius of the turn is r = 250 m.

What is the magnitude ac of the car's centripetal acceleration?

a. 0.10 m/s2
b. 2.5 m/s2
c. 0.50 m/s2
d. 0.25 m/s2
e. 0.82 m/s2

3) A force does +200 J of work when it acts on a moving object and its direction is in

the same direction as the object's displacement. How much work does this force

do when the angle between it and the object's displacement is 60°?

a. 200 J
b. 78.3 J
c. 100 J
d. 150 J
e. 87.8 J

Explanation / Answer

A) A_c = v^2/r A_c = 25^2 / 250 = 625 / 250 = 125 / 50 = 45 / 10 = 9/2 = 4.5 m/s^2

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