A race car will make one lap around circular track of radius R. When the car has

Question

A race car will make one lap around circular track of radius R. When the car has traveled halfway around the track, what is the magnitude of the car's displacement from the starting point? A) 2 pi R B) 2 R C) pi R D) R The graph shows the velocities of two objects of equal mass as a function of time. Net forces F_A, F_B, and F_C acted on the objects during intervals A, B, and C, respectively. Which one of the following choices is the correct relationship between the magnitudes of the net forces? A) F_B = F_C > F_A B) F_A > F_B = F_C C) F_A = F_B = F_C D) F_C > F_B > F_A

Explanation / Answer

6)The magnitude of displacement will be the total distance from the origin. The displacement, when it is half a lap from the origin, is given as follows.

If we consider a circle, the distance to the exact opposite side of it is the diameter, D, which is equal to twice the radius, 2R. This means that the total distance away from me is half the circle, D or 2R.

Ans-option B

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7)

A)FB=FC>FA

it is false since Fa>Fc

B)Fa>Fb=Fc

It is False since Fa is greater than Fb but it is not equal to Fc

C)Fa=Fb=Fc

It is false since Fa is greater than Fb and Fc

D)Fc>Fb>Fa

It is True since Fa is greater than Fb and Fc

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