13. A boy of mass 50 kg is at rest on a uniform plank of mass 40 kg. If AB = 1 m, BC = 3 m and CD=2m. 7 (a) Find the forces on the plank by the supports at A and C. (b) The boy started to walk to the right from B. What is the maximum distance he can walk along the plank? B

13. A boy of mass 50 kg is at rest on a uniform plank of mass 40 kg. If AB = 1 m, BC = 3 m and CD=2m. 7 (a) Find the forces on the plank by the supports at A and C. (b) The boy started to walk to the right from B. What is the maximum distance he can walk along the plank? B

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Concept explainers

Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.

Question

I want the answer for the 13th question

60cm
20cm
(a) Will the plank balance? If not, which way will it tip?
(b) What extra mass is needed at the point P to balance the plank?
40cm
13. A boy of mass 50 kg is at rest on a uniform plank of mass 40 kg. If AB = 1 m, BC = 3 m and
CD=2m.
B
Sudheera Jayamanna
(a) Find the forces on the plank by the supports at A and C.
(b) The boy started to walk to the right from B. What is the maximum distance he can walk
along the plank?
C
A
14. A uniform rod AB of length 4 m and mass 2 kg is suspended in a horizontal position by two
vertical strings attached at points P and Q where AP = 1 m and AQ=3 m. When a particle of
mass 5 kg is attached at point R of the rod, the rod is on the point of turning about P.
Calculate the distance AR.
Equilibrium
4

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