Question

Quiz08

1. A car rounds a horizontal curve with r = 50.m, and coefficient of friction is μs = 0.36. What is the largest speed of the car without skidding?

2. If a person drives a car through the top of a hill with R = 99.0m, and the speed of car at 54.0mph, and the weight of the driver is 735N, what is the weight he feels at the top?

3. M =1.28 kg ,m = 842 g ,r = 50.2 cm. What is the speed of m to keep M at rest?(the surface of the table is frictionless)

Answer #1

1) while car rounds the horizontal curve the centipetal force will be provided by the friction force

friction force

The centripetal force =

both needs to be balanced in orer for the car to not skid

2)

Weight = 735N

Mass of the driver = 735/9.8 = 75kg

Effective weight felt by the driver =

3)

Centrifugal force provided by m will be balancing the weiight of M

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