Question

A sphere of mass m is held between two smooth inclined walls. For sin 37ŗ = 3/5, the normal reaction of the wall (2) is equal to –

• A. mg
• B. mg sin 74⁰
• C. mg cos 74⁰
• D. None

Answer 1

Answer: (A)

mg

Answer 2

Using lami's theorem

$\frac { \mathrm { mg } } { \sin \left( 180 ^ { \circ } - 37 ^ { \circ } \right) }$ = $\frac { \mathrm { N } _ { 2 } } { \sin \left( 180 ^ { \circ } - 37 ^ { \circ } \right) }$

\ N₂ = m