A beam of length L and mass M is supported by, but not attached to, two posts as in the figure below. One post is at the left edge of the beam, while the other is at a distance d from the left edge. A boy of mass m starts to walk along the beam a distance of x from the right end. a. Draw a free-body diagram for the beam. b. Write an expression for the net torque about the second support. c. For L = 5.0 m, M = 40 kg, d = 3.0 m, and m = 20 kg, how close can the boy get to the right end of the beam without it falling over? (Note that the normal force from the left-end support will be zero at this moment)
A beam of length L and mass M is supported by, but not attached to, two posts as in the figure below. One post is at the left edge of the beam, while the other is at a distance d from the left edge. A boy of mass m starts to walk along the beam a distance of x from the right end. a. Draw a free-body diagram for the beam. b. Write an expression for the net torque about the second support. c. For L = 5.0 m, M = 40 kg, d = 3.0 m, and m = 20 kg, how close can the boy get to the right end of the beam without it falling over? (Note that the normal force from the left-end support will be zero at this moment)
College Physics
10th Edition
ISBN:9781285737027
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter8: Rotational Equilibrium And Rotational Dynamics
Section: Chapter Questions
Problem 26P
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A beam of length L and mass M is supported by, but not attached to, two posts as in the figure below. One post is at the left edge of the beam, while the other is at a distance d from the left edge. A boy of mass m starts to walk along the beam a distance of x from the right end.
a. Draw a free-body diagram for the beam.
b. Write an expression for the net torque about the second support.
c. For L = 5.0 m, M = 40 kg, d = 3.0 m, and m = 20 kg, how close can the boy get to the right end of the beam without it falling over? (Note that the normal force from the left-end support will be zero at this moment)
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