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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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(103)
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The electric potential at the surface of an atomic nucleus (z=50) of radius
- A parallel plate air capacitor has capacity C, distance of seperation between plate
- Two bodies of mass 0.25 kg each moving towards each other with velocity
- The parallel beams of monochromatic light of wavelength 4.5 x10⁻⁷ m passes through
- If μᵥ=1.5230 and μʀ=15.145, then dispersive power of crown glass is
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)