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A machine gun fires 10 bullets/s, each of mass 10g, the speed of each bullet is 20 cms⁻¹, then force of recoil is
Options
(a) 200 dyne
(b) 2000 dyne
(c) 20 dyne
(d) None of these
Correct Answer:
2000 dyne
Explanation:
Time taken for 1 bullet = 1/n
Force = the rate of change of momentum = mvn
= 10 x 20 x 10 = 2000 dyne
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Question Type: Memory
(964)
Difficulty Level: Easy
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Topics: Laws of Motion
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Subject: Physics
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two coils of self inductance 2 mH and 8 mH are placed so close together
- A DC ammeter has resistance 0.1Ω and its current ranges 0-100A. If the range
- A light emitting diode(LED) has a voltage drop of 2 volt across it
- An inductor 20 mH, a capacitor 50 μF and a resistor 40Ω are connected in series
- Small drops of the same size are charges to V volt each. If n such drops coalesce
Question Type: Memory (964)
Difficulty Level: Easy (1008)
Topics: Laws of Motion (103)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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