7) The angle of elevation of the sum, when the length of the shadow of a tree 3 times the height of the tree, is
Answer is:
Invalid
Related OFB Chargeman Mechanical Question Paper - 2014 with Answer Key
Answer is:
All of these
Explanation:
Nobel Prize awarded for
* Physics and Chemistry
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Answer is:
25200
Answer is:
18 cm
Answer is:
Joule
Explanation:
Whenever a force (F) acts on a body and the body undergoes a displacement (x) in the direction of the force, then the work is said to be done.
Mathematically, Workdone = F.x = Force x Displacement.
The unit of work depends upon the unit of force and the displacement. In S.I. system of units, the practical unit of work is N-m. It is the work done by a force of 1 newton when it displaces a body through 1 metre. The work of 1 N-m is known as joule (briefly written as J), such that 1 N-m = 1 J.