7th Edition

ISBN: 9780077492168

Author: Chapra

Publisher: MCG

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Chapter 12, Problem 16P

Civil/Environmental Engineering

Calculate the forces and reactions for the truss in Fig. 12.4 if a downward force of 2500 kg and a horizontal force to the right of 2000 kg are applied at node 1.

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Chapter 12, Problem 15P

Chapter 12, Problem 17P

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Two blocks of masses m1 and m2 (m1 > m2) are placed on a frictionless table in contact with each other. A horizontal force of magnitude f is applied to the block of mass m1 in Figure P4.32. (a) If P is the magnitude of the contact force between the blocks, draw the free-body diagrams for each block. (b) What is the net force on the system consisting of both blocks? (c) What is the net force acting on m1? (d) What is the net force acting on m2? (e) Write the x -component of Newton’s second law for each block. (f) Solve the resulting system of two equations and two unknowns, expressing the acceleration a and contact force P in terms of the masses and force. (g) How would the answers change if the force had been applied to m2 instead? (Hint: use symmetry; don’t calculate!) Is the contact force larger, smaller, or the same in this case? Why?

Calculate the forces in member AC for the loaded truss in Figure Q8.a) -2.82 kNb) +3.2 kNc) +2.82kNd) None of above

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Chapter 12 Solutions

Numerical Methods for Engineers

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At one point in time when a sprinter is leaving his starting blocks shortly after the starting gun has been fired, he is pushing back on one foot on the block. His other foot has left the block. The force he exerts on the block in the anterior posterior axis is 940 N and in the vertical axis he exerts a force of 910 N on the ground. What would be the magnitude and direction (relative to horizontal) of the resultant of these two forces?

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