Momentum and CollisionMedium
Question
A glass full of water is placed on a weighing scale, which reads 10 N. A coin with weight 1 N is gently released into the water. At first, the coin accelerates as it falls and about halfway down the glass, the coin reaches terminal velocity. Eventually, the coin rests on the bottom of the glass. Acceleration due to gravity is 10 m/s2. The scale reads
Options
A.10.5 N when the coin accelerates at 5 m/s2.
B.11.5 N, when the coin decelerates at 5 m/s2.
C.11 N, when the coin moves with terminal velocity.
D.11 N, when the coin rests on the bottom.
Solution
When coin moves with terminal velocity or rests on the bottom Reading = 10 + 1 = 11 N
When coin moves with acceleration of 5 m/s2 Reading = 10 + 1 (1/2) = 10.5 N
When coin moves with acceleration of 5 m/s2 Reading = 10 + 1 (1/2) = 10.5 N
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