Multiple Choice Section 1) (3 points) A pendulum bob of mass m is attached to th

Question

Multiple Choice Section 1) (3 points) A pendulum bob of mass m is attached to the ceiling by a thin wixe of length L. The bob moves at constant speed in a horizontal circle of radius R, witt te wire making a constant angle o with the vertical Gust like in the lab). The tenakou i the wire a) is greater than mg b) is equal to mg. c) is less than mg. d) could be all three of the above, depending on the values of m, L, R, and a 2) (3 points) You are walking on a level loor. Yon are getting good traction, so the soles of your shoes don't slip on the floor. Which of the following forces sbould be included in a free-body diagram for your body? a) the force of kinetic friction that the floor exerts on your shoes b) the force of static friction that the floor exerts on your shoes c) the force of kinetic friction that your shoes exert on the floor d) the force of static friction that your shoes exert on the floor e) more than one of these 3) (4 points) A truck is rounding a corner at velocity v and requires a force F from the tires to keep it in constant circular motion. If the truck doubles it's speed, the new force F required by the tires is:

Explanation / Answer

Question 3) Let initial speed = v1 , initial force = F1

Using the formula,

F = mv^2/r

So ,

Force (F) is directly proportional to the v^2

In the first case , F1 = m*v1^2/r

When the speed is doubled , v2 = 2*v1

F1/F2 = v1^2/v2^2

F1/F2 = v1^2/(2*v1)^2

F1/F2 = 1/4

F2 = 4*F1

Thus , answer) option d)

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