Home
Class 11
PHYSICS
A metre scale is balanced on a knife edg...

A metre scale is balanced on a knife edge at its centre. When a mass of 10 kg is kept at the 12 cm mark, the scale is balanced at 45 cm. What is the mass of the metre scale?

A

56 g

B

76 g

C

86 g

D

66 g

Text Solution

Verified by Experts

The correct Answer is:
D

The mass (m) of the metre scale is concentrated at the centre C. When 10 kg mass is kept at 12 mark, it is balanced at C'. Taking moments about C, we get
`10g(45-12)=mg(50-45)`
`therefore 330 = 5 m " " therefore m = 66 g`
Promotional Banner

Topper's Solved these Questions

  • FORCE, WORK AND TORQUE

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP|10 Videos

  • FRICTIONAL IN SOLIDS AND LIQUIDS

    MARVEL PUBLICATION|Exercise TEST YOUR GRASP|10 Videos

Similar Questions

Explore conceptually related problems

A metre scale is balanced on a knife edge at its centre. When a coin of mass 15 g is kept at the 12 cm mark, the scale is found to be balanced at 45 cm. What is the mass of the metre scale?

A metre stick is balanced on a knife edge at its centre. When two coins, each of mass 6 g put one on top of the other at the 12.0 cm mark, the stick is found to be balanced at 45.0 cm. What is the mass of the metre stick?

A metre stick is balanced on a knife edge at its centre. When two coins, each of mass 5 g are put one on one of the other at the 12 cm mark, the stick is found to balanced at 45 cm . The mass of the metre stick is.

A metre stick is balanced on a knife edge at its centre. When two coins, each of mass 5 g are put one on top of the other at the 12 cm mark, the stick is found to be balanced at 45 cm. The mass of metre stick is