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The movable jaw of a vice moves through ...

The movable jaw of a vice moves through a distance of 7mm for one complete rotation of the handle. Through how many rotation shold the handle be rotated so that it holds a metal plate of thickness 3.5 cm firmly.

A

` 3`

B

` 5`

C

` 3 (1)/(2)`

D

` 2 (1)/(2)`

Text Solution

Verified by Experts

The correct Answer is:
A
Number of rotations through which a handle is rotated, (n) = ?
Thickness of the metal plate, (t) = 3.5 cm.
` therefore ` Distance moved by the jaw = thickness of plate which is held.
` therefore 3.5 cm = n xx` Distance moved by jaw per one rotation.
` 3.5 cm = n xx 7 mm `
`3.5 xx 10 mm = n xx 7 mm`
` n = (35)/(7) `
` therefore ` Number of rotations made by handle, (n) = 5.
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