A6900-pound vehicle is driven at a speed of 39 miles per hour on a circular interchange of radius 250 feet. to keep the vehicle from skidding off course, what frictional force must the road surface exert on the tires? (round your answer to one decimal place.)

Apulley system is used to lift a 2,000 newton engine up a distance of 3 meters. the operator must apply a force of 250 newtons to the chain of the pulley system to lift the motor. to lift the engine 3 meters, the operator must pull a total of 30 meters of chain through the pulley system. what is the value of di?