According to lami's theorem the three forces must be equal the three forces must

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Question
According to lami's theorem
Options
A. the three forces must be equal
B. the three forces must be at 120� to each other
C. the three forces must be in equilibrium
D. if the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two

Correct Answer

if the three forces acting at a point are in equilibrium, then each force is proportional to the sine of the angle between the other two

Engineering Mechanics problems

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1. A lead ball with a certain velocity is made to strike a wall, it falls down, but rubber ball of same mass and with same velocity strikes the same wall, it rebounds. Select the correct reason from the following:
Options
A. both the balls undergo an equal change in momentum
B. the change in momentum suffered by rubber ball is more than the lead ball
C. the change in momentum suffered by rubber ball is less than the lead ball
D. none of the above

4. The forces, which meet at one point and their lines of action also lie on the same plane, are known as
Options
A. coplaner concurrent forces
B. coplaner non-concurrent forces
C. non-coplaner concurrent forces
D. non-coplaner non-concurrent forces

9. In a single threaded worm and worm wheel, the number of teeth on the worm is 50. The diameter of the effort wheel is 100 mm and that of load drum is 50 mm. The velocity ratio is
Options
A. 50
B. 100
C. 150
D. 200

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