Momentum and CollisionHard
Question
A wooden cube first floats inside water when a 200 g mass is placed on it. When the mass is removed the cube is 2 cm above water level. The side of cube is : -
Options
A.5 cm
B.10 cm
C.15 cm
D.20 cm
Solution
Let mass of cube is m and side is a then
(m + 200)g = a3 ρwg ...... (i)
mg = a2(a - 2) ρwg ......(ii)
⇒ a2(a - 2) ρw + 200 = a3 ρw
⇒ a2 = 100 ⇒ a = 10 cm
(m + 200)g = a3 ρwg ...... (i)
mg = a2(a - 2) ρwg ......(ii)
⇒ a2(a - 2) ρw + 200 = a3 ρw
⇒ a2 = 100 ⇒ a = 10 cm
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