A wind blowing parallel to the ground gives the pingpong

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Reference no: EM1358675

Q. A student sits atop a platform a distance above the ground. He throws a pingpong ball horizontally with a speed . However, a wind blowing parallel to the ground gives the pingpong ball a constant horizontal acceleration with magnitude . This results in the pingpong ball reaching the ground directly under the student.

Q. A sled weighing 189 N rests on a 15° incline, held in place by static friction. The coefficient of static friction is 0.50.

(a) What is the magnitude of the normal force on the sled?

(b) What is the magnitude of the static friction on the sled?

(c) The sled is now pulled up the incline at constant speed by a child. The child weighs 431 N and pulls on the rope with a constant force of 100 N. The rope makes an angle of 30° with the incline and has negligible weight. What is the magnitude of the kinetic friction force on the sled? (Enter 0 if sled does not move.)

(d) What is the coefficient of kinetic friction between the sled and the incline? (Enter 0 if sled does not move.)

(e) What is the magnitude of the force exerted on the child by the incline?

Reference no: EM1358675

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