1
. Consider a conical pendulum with an 74.2 kg bob on a 12.5 m wire making an angle
of θ=3.40° with the vertical, as seen in the figure below.
Determine the horizontal and vertical components of the force exerted by the wire on the
pendulum. Enter the horizontal component first and then the vertical component.
Answer:
4.32E+01 N 7.28E+02 N
2
. Calculate the radial acceleration of the bob.
Answer:
5.83E01 m/s^2
3
. A 0.345 kg object is swung in a vertical circular path on a string 0.450 m long. If its
speed is 3.86 m/s at the top of the circle, what is the tension in the string there?
Answer:
8.04E+00 N
4
. An 1810 kg car passes over a bump in a road that follows the arc of a circle of radius
42.9 m as seen in the figure below.
What force does the road exert on the car as the car passes the highest point of the bump
if the car travels at 16.5 m/s?
Answer:
6.27E+03 N
5
. [1 point, 10 tries]
What is the maximum speed the car can have as it passes this highest point before losing
contact with the road?
Answer:
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 Spring '08
 N. MCKAY
 mechanics, Force, Friction, Tire, circumference travel

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