7. A 1800 kg car drives up an inclined of 8% from rest at uniform acceleration to a velocity of 60 kph after traveling 75 m. Its wheels are 3 m apart with its center of gravity midway of the wheels and 500 mm from the ground. If all frictional force is assumed to act at the rear wheels.

Question

A. Which of the following gives the acceleration of the car.
B. Which of the following gives the normal force on front wheels.
C. Which of the following gives the minimum coefficient of friction needed so that motion is possible.

8. An auto, equipped only front wheel brakes, has a wheelbase of 3 m with its c.g. located 1.50 m ahead of the rear wheels and 0.90 m above the pavement. If μK = 0.80 at the tires, compute the minimum distance in which the auto can be brought to rest from a speed of 90 kph, if the driver’s reaction time before applying the brakes is 3/4 second.

Answer 1

VERY GOOD

Answer 2

OKAY