1800-150-456-789
FlagBACK
Flag Mechanics> Please explain this question. I tried it ...
question mark

Please explain this question. I tried it many times but failed.I don't understand the meaning of normal reaction on hinge meaning here.I asked it previously also but got wrong answer .Plss.....help me out in this.
Q-A uniform rod of length L and mass M is held horizontally with the help of one light vertical string and a hinge as shown.If the string is cut suddenly,find out the initial normal reaction on the hinge
Correct answer is Mg/4(This anwer is correct.Please help me.)

Kaushki , 6 Years ago
Grade 12th pass
anser 2 Answers
Arun

Last Activity: 6 Years ago

 
take the center of mass as axis of rotation,
the net torque is zero in initial state.
Ta=Tb =>Fa×ra=Fb×rb
here Ta is torque by hinge and Tb is torque by the rope.
ra=rb because the axis of rotation is at the center of the rod.
from this we get our both the forces to be equal.
and the net forces are zero
the forces upward i.e.Fa and Fb are opposed by a force downwards
the only force downwards is mg
Fa +Fb=mg
2Fa=mg   …......from our calculation above.
Fa=mg/2
after cutting the rope the force on right is removed but force on ,left acts as normal reaction and this is equal to mg/2.

Kaushki

Last Activity: 6 Years ago

Thank you so much.Now ,I understand it properly.
…
.....
.........
............
...................................

star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments


Other Related Questions on mechanics

question mark
A metal strip clamped at one end vibrates with a frequency of 20 Hz and amplitude of 5 mm
at the free end, where a small mass of 2 g is positioned. determine
(i) The velocity of the end when passing through the zero position
(ii) The acceleration at maximum displacement
(iii) The maximum kinetic energy of the mass
mechanics
2 Answers Available

Last Activity: 2 Years ago

question mark
An object of mass m = 0.25 kg oscillates in a fluid at the end of a vertical spring of spring
constant kH = 85 N/m, see Fig.1. The effect of the fluid resistance is governed by the
damping constant b = 0.07kg/s.
(i) Find the period of the damped oscillation.
(ii) By what percentage does the amplitude of the oscillation decrease in each cycle? 
mechanics
1 Answer Available

Last Activity: 2 Years ago

question mark
If a=x² find the displacement at t =3sec if body velocity at t= 0 sec is 0
mechanics
1 Answer Available

Last Activity: 2 Years ago

question mark
A particle is traveling in a circle of radius R =2.5m and with an angular velocity of 10 rad/s. What is the centripetal acceleration of the particle? The particle begins to slow down with an angular acceleration of -1 rad/s2. After 5 seconds, what is the centripetal acceleration and the tangential acceleration fo the particle?
mechanics
1 Answer Available

Last Activity: 2 Years ago

question mark
If the acceleration of block A is 5 m/s^2
Find the acceleration of block B
mechanics
1 Answer Available

Last Activity: 2 Years ago