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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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- Two planets at mean distances d₁ and d₂ from the sun have their frequencies n₁ and n₂
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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
- If t₁ ̷ ₂ is the half-life of a substance, then t₃ ̷ ₄ is the time in which
- Two planets at mean distances d₁ and d₂ from the sun have their frequencies n₁ and n₂
- Three capacitors 3μF,6μF and 6μF are connected in series to a source of 120V.
- A series L-C-R circuit contains inductance 5 mH, capacitance 2 μF and resistance
- For photoelectric emission to take place
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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