A) I-70 is building a new curved exit. It will be banked so that cars can exit the highway at 45 mph (20.1 m/s). The radius allotted for this curve is 65 m. At what angle should the curve be banked if there is no friction? b) If the coefficient of friction between the tires and the road is 1.2, how fast can a car take the curve?

An explanation would be helpful:)

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.

The number of passengers who arrive at the platform of a subway station for the 10 am train is a random variable with a mean of 120 and a variance of 16. find the lower bound of the probability that there will be between 100 and 140 passengers (round off to second decimal place).

Anika asks eva to roll a basketball and then a bowling ball to her. which requires more force to roll, and why?