PROBLEM 1 A block of 200 kg mass rests on a rough horizontal plane. Find the force required in each of the following cases: (a) to just pull the block by a horizontal force P, (b) to just pull the block by an inclined force P inclined at 30° to the horizontal, and (c) to just push the block by a horizontal force P. The coefficient of static friction between the contact surfaces is 0.3. Fig. 6.11(a) 30⁰ Fig. 6.11(b) Fig. 6.11(c)

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A:

Q: For the following composite beam which is built up out of two wooden beams and three steel plates,…

A: The given data is: For wood : E = 15 GPa, σmax = 7.5 MPa For steel : E = 200 GPa, σmax = 150 MPa

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Q: Situation 9: A beam is loaded as shown in the figure. Its cross-sectional properties are also given.…

A:

Q: A uniform structural tubing column AB with a height of 4 m has a cross section as shown in Figure…

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A:

Q: 4. Determine the smallest horizontal force P required to lift the 200-kg crate. The coefficient of…

A:

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A: Size of bar 50mm x 50mm x 150mm P = 250 kN or 250,000 N

System of Forces

A force is an external influence or agent that changes the state of a system. According to Newton's second law, the force applied to a body is proportional to the change in momentum of a body. Hence, whenever a force is applied to a body, its momentum changes. If the body is at rest, under the action of force, its state of rest changes to motion. In other words, the magnitude of the momentum of the body changes from zero to a measurable value. Similarly, if the body possesses some initial velocity, it has some associated momentum, the effect of force can cause the body to halt or come to rest, that is, the momentum reduces to zero.