Homework Help: physics

Posted by bob on Wednesday, February 27, 2013 at 8:43am.

a 3000 pound car is parked on a hill at an angle of elevation of 16 degrees. how much force must the brakes exert to keep the car from rolling down the hill?

physics - Henry, Thursday, February 28, 2013 at 7:26pm
Wc=3000Lbs*0.454kg/Lb * 9.8N/kg=13,348N
= Wt. of car.

Fp = 13348*sin16 = 3679 N. = Force parallel to the hill.

Fe - Fp = m*a
Fe - 3679 = m*0 = 0.
Fe = 3679 N. = Force exerted by brakes.

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