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Grade 11IIT JEE Entrance Exam

a hammer of mass 1 kg strikes on the head of a nail with velocity of 2ms^-1. it drives the nail 0.01 m into a wooden block. find the force applied by the hammer and the time of impact.

sharmi jakkala

12 Years agoGrade 11

3 Answers

Aziz Alam

Approved Tutor Answer12 Years ago

v=0 m/s , u=2 m/s => v²-u² =2as => a=200 m/s2

Force applied by hammer= 200x1=200 N

time of impact= 2/200=0.01 seconds=10 milli seconds

Thanks & Regards
Aziz Alam
IIT Roorkee
askIITians

saket

9 Years ago

A uniform rope of length L,resting on a frictionless horizontal table is pulled at one end by a force F.What is the tension in the rope at a distance x from the end where the force is applied?

SAHIL

9 Years ago

Let n be the mass per unit length of rope. Therefore, mass of rope = nL

. Acceleration in the rope due to force F will be a = F/nL.

Mass of rope of length (L - l ) will be n (L - l ).

Therefore, tension in the rope of length (L - l ), is equal to pulling force on it = n (L - l ) a = n (L - l ) × F/nL = F (1 - el /L)

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