Matter and Interactions
4th Edition
ISBN: 9781118875865
Author: Ruth W. Chabay, Bruce A. Sherwood
Publisher: WILEY
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Chapter 5, Problem 47P
To determine
The period of the planet of orbital radius
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solve 27 B
Calf muscle
Lower leg bones
B
A
C
d
AB
A-
dBC
Ꮎ
B
The top left figure shows an anatomical structure in the lower leg and foot that are involved in standing on
tiptoe, with the heel raised slightly off the floor so that the foot effectively contacts the floor only at point C.
The calf muscle pulls on the foot at point A, which is rotating around point B where the foot contacts the
lower leg bones.
We want to compute the pulling force FA of the calf muscle necessary for the person to stand on tiptoe as
well as the force FB on the lower leg bones from the foot. For simplicity we will assume that the points A, B
and C lie on a single line as shown on the simplified diagram on the right. Assume distance dAB = 5.00 cm,
distance dBC = 15.0 cm, the angle between the floor and the foot is 0 = 10.0°, and the person's mass m =
80.0 kg. We will neglect the weight of the foot.
a) Draw a diagram showing the forces acting on the foot. (1 point)
b) Assuming rotational equilibrium compute the calf…
3. You are in a tall building located near the equator. As you ride an elevator from the ground floor to
the top floor, your tangential speed due to the earth's rotation
a. increases
b. decreases
increases when the speed of the elevator increases and decreases when the speed of the
elevator decreases
d. does not change
Chapter 5 Solutions
Matter and Interactions
Ch. 5.4 - An object is moving with constant momentum ⟨10,...Ch. 5 - Prob. 1QCh. 5 - A student said, “When the Moon goes around the...Ch. 5 - A space shuttle is in a circular orbit near the...Ch. 5 - Tarzan swings back and forth on a vine. At the...Ch. 5 - Tarzan swings from a vine. When he is at the...Ch. 5 - A rope is attached to a block, as shown in Figure...Ch. 5 - A box of mass 40 kg hangs motionless from two...Ch. 5 - A helicopter flies to the right (in the +x...Ch. 5 - You pull with a force of 255 N on a rope that is...
Ch. 5 - A ball of mass 450 g hangs from a spring whose...Ch. 5 - An 800 kg load is suspended as shown in Figure...Ch. 5 - An elevator is accelerating upward at a rate of...Ch. 5 - Prob. 16PCh. 5 - Prob. 17PCh. 5 - Prob. 18PCh. 5 - The angle between the gravitational force on a...Ch. 5 - Prob. 20PCh. 5 - Prob. 21PCh. 5 - An object moving at a constant speed of 23 m/s is...Ch. 5 - The radius of a merry-go-round is 7 m, and it...Ch. 5 - A proton moving in a magnetic field follows the...Ch. 5 - A proton moving in a magnetic field follows the...Ch. 5 - Prob. 26PCh. 5 - A child of mass 40 kg sits on a wooden horse on a...Ch. 5 - Prob. 28PCh. 5 - Prob. 29PCh. 5 - Prob. 30PCh. 5 - Prob. 31PCh. 5 - Prob. 32PCh. 5 - Prob. 33PCh. 5 - Prob. 34PCh. 5 - Prob. 35PCh. 5 - Prob. 36PCh. 5 - Prob. 37PCh. 5 - Prob. 38PCh. 5 - Prob. 39PCh. 5 - Prob. 40PCh. 5 - Prob. 41PCh. 5 - Prob. 42PCh. 5 - Prob. 43PCh. 5 - Prob. 44PCh. 5 - Prob. 45PCh. 5 - Prob. 46PCh. 5 - Prob. 47PCh. 5 - In the 1970s the astronomer Vera Rubin made...Ch. 5 - Prob. 49PCh. 5 - Prob. 50PCh. 5 - Prob. 51PCh. 5 - Prob. 53PCh. 5 - Prob. 54PCh. 5 - Remarkable data indicate the presence of a massive...Ch. 5 - Prob. 56P
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