Matter and Interactions
Matter and Interactions
4th Edition
ISBN: 9781118875865
Author: Ruth W. Chabay, Bruce A. Sherwood
Publisher: WILEY
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Chapter 5, Problem 50P

(a)

To determine

The speed with the roller coaster must go over the top of the circular arc for the person to feel weightless.

(b)

To determine

The speed with the roller coaster must go through a circular loop for the person to feel three times heavy as usual.

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please help with 27 part A.
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…

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