A boat having a length 7 m and breadth 2 m is floating on a lake. The boat sinks by 1cm when a man gets on it. The mass of the man is:
Pick.
A) 140 kg  B) 60 kg  C) 72 kg  D) 96 kg  E) None of these
Explanation:   Volume of water displaced = (7 x 2 x 0.01) m3   = 0.14 m3.   ∴ Mass of man = Volume of Water displaced x Density of water   = (0.14 x 1000)kg   = 140 kg.   140 kgnswer: 140 kg
<result>A</result>
A boat having a length 7 m and breadth 2 m is floating on a lake. The boat sinks by 1cm when a man gets on it. The mass of the man is: