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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.
Related Questions: - The magnetic flux linked with a coil at any instant t is given by ?, find emf
- Current in a coil changes from 4 A to zero in 0.1 second and the emf induced is 100V
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Topics: Laws of Motion
(103)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The magnetic flux linked with a coil at any instant t is given by ?, find emf
- Current in a coil changes from 4 A to zero in 0.1 second and the emf induced is 100V
- A common emitter amplifier gives an output of 3 V for an input of 0.01 V.
- Two tuning forks are sounded together and produce 2 beats per second.
- An alternating emf given by equation e=300 sin[(100 π)t] V
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)