Physics for Scientists and Engineers, Vol. 1
6th Edition
ISBN: 9781429201322
Author: Paul A. Tipler, Gene Mosca
Publisher: Macmillan Higher Education
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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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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
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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.
the driver of a car on a horizontal road makesan emergency stop by applying the brakes so that all four wheelslock and skid along the road.The coefficient of kinetic friction betweentires and road is 0.40.The separation between the front andrear axles is L = 4.2 m, and the center of mass of the car is locatedat distance d =1.8 m behind the front axle and distance h = 0.75 mabove the road. The car weighs 11 kN. Find the magnitude of (a)the braking acceleration of the car, (b) the normal force on eachrear wheel, (c) the normal force on each front wheel, (d) the brakingforce on each rear wheel, and (e) the braking force on eachfront wheel. (Hint: Although the car is not in translational equilibrium,it is in rotational equilibrium.)
A meter stick has a mass of 0.5 kg and a center of mass at the 50 cm mark. Using two fingers, one at the 10 cm mark and the other at the 40 cm mark, you hold the meter stick in a stationary horizontal position. Find the forces that your fingers put on the meter stick.
Chapter 5 Solutions
Physics for Scientists and Engineers, Vol. 1
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