Q 41

The coefficient of static friction for the tires of a race car is 0.950 and the coefficient of kinetic friction is 0.800.The car is on a level circular track of 50.0 m radius on a planet where compared to Earth's .The maximum safe speed on the track on the planet is ____ times as large as the maximum safe speed on Earth.
A)0.250
B)0.500
C)1.00
D)2.00
E)4.00

Q 42

The coefficient of static friction for the tires of a race car is 0.950 and the coefficient of kinetic friction is 0.800.The car is on a level circular track of 50.0 m radius on a planet where compared to Earth's .If the car is to be able to travel at the same speed on the planet as on Earth,the radius of the track on the planet must be ____ times as large as the radius of the track on Earth.
A)0.250
B)0.500
C)1.00
D)2.00
E)4.00

Q 43

The following equation was obtained by solving a physics problem: The best physical representation of the situation is
A)A car traveling at 16.0 m/s is 19.2 into a turn of a quarter circle on a level road.
B)A mass on a string that is originally horizontal has fallen to where the angle between the string and the vertical direction is 19.2.
C)A mass on a string originally horizontal has fallen 19.2 from the horizontal direction.
D)A car traveling at 16.0 m/s is on a circular curve banked at 19.2.
E)A car traveling at 16.0 m/s and going over a semicircular mountain-top road is 19.2 down from the top.