Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 5, Problem 19P
To determine
To Compare: The magnitude of the resulting acceleration of the centre of mass of the two-puck system and the magnitude of acceleration of
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A person is pushing a fully loaded 28.90 kg wheelbarrow at
constant velocity along a plank that makes an angle
32.0° with the horizontal. The load is distributed such
that the center of mass of the wheelbarrow is exactly
halfway along its length L.
What is the magnitude of the total force F, the person must
apply so that the wheelbarrow is parallel to that plank? You
may neglect the radius of the wheel in your a
nalysis. The
gravitational acceleration is g = 9.81 m/s.
N.
Consider the woman doing push-ups in the figure. She has a mass of 51.3 kg,
CG
land the distance from her feet to her center of mass is 0.85 m, while the distance from her feet to her
hands is 1.7 m.
a
Freaction
b
Part (a) What force in newtons should the woman in the figure exert on the floor with each hand to do a push-up? Assume that she moves up at a
constant speed.
Part (b) The triceps muscle at the back of her upper arm has an effective lever arm of 1.25 cm, and she exerts force on the floor at a horizontal
distance of 16 cm from the elbow joint. Calculate the magnitude of the force in newtons for each triceps muscle.
Part (c) How much work in joules does she do if her center of mass rises 0.21 m?
Part (d) What is her useful power output, in watts, if she does 25 pushups in one minute? For the sake of simplicity, ignore any power used by her
muscles lowering her body during each pushup.
Two blocks, with masses m and 3m, are attached to the ends of a string with negligible mass that passes over a pulley, as shown above. The pulley has negligible mass and friction and is attached to the ceiling by a bracket.The blocks are simultaneously released from rest.
The acceleration of the center of mass of the blocks-string-pulley system has magnitude aCOM . Briefly explain, in terms of any external forces acting on the system, why aCOM is less than g.
Chapter 5 Solutions
Physics for Scientists and Engineers
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