Question

A vessel filled with water is kept on a weighing pan and the scale adjusted to zero. A block of mass 10 kg is suspended by a massless spring of spring constant `k=100N//m`. This block is submerged inside into the water in the vessel such that elongation i spring is `x=10cm`. What is the reading of the scale?
A. 100 N
B. 10 N
C. 110 N
D. 90 N

Answer 1

Correct Answer - D
`mg=kx+F_(B)`, Bouyancy force force on the block is equal to force on vessel i.e., `=` reading of scale.