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An open knife edge of mass 200g is dropped from height 5m on a cardboard. If the knife edge penetrates distance 2m into the cardboard, the average resistance offered by the cardboard to the knife edge is
Options
(a) 7N
(b) 25N
(c) 35N
(d) None of these
Correct Answer:
7N
Explanation:
No explanation available. Be the first to write the explanation for this question by commenting below.
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- If ∆U and ∆W represent the increase in internal energy and work done by the system
- A sound absorber attenuates the sound level by 20 dB. The intensity decreases
- A particle starting from the origin (0, 0) moves in a straight line in the (x, y) plane
- Huygen’s wave theory could not explain
- In a n-p-n transistor about 10¹⁰ electrons enter the emitter in 2 μs,
Topics: Laws of Motion (103)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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We can use work energy theorem ,
Total kinetic energy lost is K=mg(h+d)
Work done by the resistance force F is W=Fd
By equating , we get Force =
mg(h+d)/d = [{(200/1000)×(5+2)}/2] N = [0.2×7÷2] N = 7N (ans)