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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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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The momentum of a photon of energy 1 MeV in kg m/s will be
- A particle starting from the origin (0, 0) moves in a straight line in the (x, y) plane
- If |A x B|= √3 A.B , then the value of |A + B| is
- A polarised light of intensity I₀ is passed through another polariser whose pass axis
- Charge passing through a conductor of cross-section area A=0.3 m² is given
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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)