1) A box full of books rests on a wooden floor. The normal force the floor exert
ID: 2134054 • Letter: 1
Question
1) A box full of books rests on a wooden floor. The normal force the floor exerts on the box is 234 N.
2) When on the ground, Ian's weight is measured to be 618 N. When Ian is on an elevator, his apparent weight is 711 N. What is the net force on the system (Ian and the elevator) if their combined mass is 1050 kg?
3) You want to push a 52-kg box up a 16
A box full of books rests on a wooden floor. The normal force the floor exerts on the box is 234 N. You push horizontally on the box with a force of 128 N, but it refuses to budge. What can you say about the coefficient of static friction between the box and the floor? If you must push horizontally on the box with a force of at least 136 N to start it sliding, what is the coefficient of static friction? Once the box is sliding, you only have to push with a force of 115 N to keep it sliding. What is the coefficient of kinetic friction? When on the ground, Ian's weight is measured to be 618 N. When Ian is on an elevator, his apparent weight is 711 N. What is the net force on the system (Ian and the elevator) if their combined mass is 1050 kg? You want to push a 52-kg box up a 16degree ramp. The coefficient of kinetic friction between the ramp and the box is 0.17. With what magnitude force parallel to the ramp should you push on the box so that it moves up the ramp at a constant speed? A model rocket is fired vertically from rest. It has a net acceleration of 19.0 m/s2. After 1.6 s, its fuel is exhausted and its only acceleration is that due to gravity. Ignoring air resistance, how high does the rocket travel? How long after liftoff does the rocket return to the ground? s An elevator cable winds on a drum of radius 70.0 cm that is connected to a motor. If the elevator is moving down at 0.40 m/s, what is the angular speed of the drum? Grace is playing with her dolls and decides to give them a ride on a merry-go-round. She places one of them on an old record player turntable and sets the angular speed at 33.3 rpm. What is their angular speed in rad/s?Explanation / Answer
a_) u_s = 128/234 > 0.547
b) u_s = 136/234 = 0.581
c) u_k = 115/234 = 0.491
2) N =mg + ma
711 = 618 + (618/9.8)a
a =1.48 m.s2
N = 1050 (9 + 1.48) =11838.50 N
3) F = 52gsin16 + 0.17x 52gcos16 = 223.75 N
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