Physics for Scientists and Engineers
6th Edition
ISBN: 9781429281843
Author: Tipler
Publisher: MAC HIGHER
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Chapter 12, Problem 19P
To determine
To Find:The centre of gravity
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2) A student’s head is bent over her physics book. The head weighs P = 24.6 N and is supported by the muscle force F→mF→m exerted by the neck extensor muscles and by the contact force F→cF→c exerted at the atlantooccipital joint. Given that the magnitude of F→mF→m is 60.0 N and is directed 35.0° below the horizontal.
a.) Find the magnitude of the contact force F→cF→c .
b.)Find the direction of the contact force Fc−→Fc→ . If the direction is below the horizontal, enter a negative value.
determine the lengths a and b from center of gravity.
Needs Complete typed solution with 100 % accuracy.
In downhill speed skiing a skier is retarded by both the air drag force on the body and the kinetic frictional force on the skis. (a) Suppose the slope angle is u =40.0, the snow is dry snow with a coefficient of kinetic friction mk =0.0400, the mass of the skier and equipment is m =85.0 kg, the cross-sectional area of the (tucked) skier is A = 1.30 m2, the drag coefficient is C =0.150, and the air density is 1.20 kg/m3. (a) What is the terminal speed? (b) If a skier can vary C by a slight amount dC by adjusting, say, the hand positions, what is the corresponding variation in the terminal speed?
Chapter 12 Solutions
Physics for Scientists and Engineers
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