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Question

What is rise in temperature of a collective drop when initially 1 gm and 2 gm drops travel with velocities 10 cm/sec and 15 cm/sec.

A
6.6×103 C
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B
66×103 C
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C
660×103 C
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D
66C
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Solution

The correct option is B 66×103 C
momentum is conserved.

1×10+2×15=3×v

v=403

Change in Kinetic Energy

Δk=12×1×(10)2+12×2×(15)212×3(403)2

Δk=2758003 erg.

=253erg

=253×107 J

this energy forms to increase temp.

253×107=3×103×4.2×Δ T

ΔT=66×1030C

Answer: (B)

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