Download Problems in Fc Set equal to Force Providing

Hwk: Problems in Fc Set equal to providing Force.
1. A truck with rubber tires on dry asphalt rounds a turn. If the radius of the turn is 10.0 m,
with what maximum speed can it turn?:st = 0.85
2. The maximum velocity a bumper car can make a turn is 2.3 m/s. If the radius is 4.0 m,
what it  the coefficient of friction?
3. A car with rubber tires (st = 0.9) is turning on dry concrete at 5.0 m/s. What is the radius
above which the car can safely turn?
4. A washer is spinning clockwise so that the socks in it are stuck to the wall. Sketch a 0.02kg sock in the dryer and show the direction of the sock’s velocity, acceleration, and all
the forces acting on the sock.
5. What is providing the centripetal force on the sock in the example above?
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6. The washer from above has a radius of 0.74-m and spins at a constant speed of 3.6 m/s.
What is the centripetal force on the sock?
7. What is , the coefficient of friction between the sock and the wall?
8. The Earth rotates on its axis once every 24 hours.
a. Use the radius of the Earth to calculate the Earth’s circular speed in m/s.
b. Calculate the centripetal force required to hold a 100-kg football player moving
in a circle at the rotational speed of the Earth.
c. What force provides the Fc that holds the player to the Earth?
d. Early skeptics thought that if the Earth were a rotating a sphere that people would
fly off its surface. Use a calculation and explain how they are wrong.
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