Engineering Mechanics
If a number of forces are acting at a point, their resultant is given by

(∑V)2 + (∑H)2
√[(∑V)2 +(∑H)2 +2(∑V)(∑H)]
(∑V)2 +(∑H)2 +2(∑V)(∑H)
√[(∑V)2 + (∑H)2]

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Engineering Mechanics
Non-coplanar concurrent forces are those forces which

Meet at one point and their lines of action also lie on the same plane
Do not meet at one point, but their lines of action lie on the same plane
Meet at one point, but their lines of action do not lie on the same plane
Do not meet at one point and their lines of action do not lie on the same plane

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Engineering Mechanics
One joule means that

Work is done by a force of 1 g when it displaces a body through 1 cm
Work is done by a force of 1 kg when it displaces a body through 1 m
Work is done by a force of 1 dyne when it displaces a body through 1 cm
Work is done by a force of 1 N when it displaces a body through 1 m

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