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January 29, 2015

January 29, 2015

Posted by **basha** on Saturday, August 4, 2012 at 11:00pm.

- SOLID MECHANICS -
**basha**, Saturday, August 4, 2012 at 11:38pmA body is said to be perfectly elastic, if it returns back___________

- Dynamics -
**Ajayb**, Sunday, August 5, 2012 at 3:25amThe kinetic energy of the car will be dissipated as heat due to the frictional forces.

KE=(1/2)mV^2=1500*36/2=27000 J

The work done by frictional forces=F*d

Now, F*d=KE

F=KE/d=27000/5=5400 N

- Dynamics -
**Elena**, Sunday, August 5, 2012 at 4:24amm=1500 kg; α =20º; s=5 m

KE=W(fr)+PE.

KE=m晇²/2;

W(fr) =F(fr) 晄

PE=m昰昲=m昰晄晄inα.

m晇²/2 = F(fr) 晄+ m昰晄晄inα;

F(fr)= m{ v²/2 - g晄晄inα}/s =

= 1500{36/2 -9.8𠽼.342}/5 =372.6 N

---------------

The body is perfectly elastic if after being deformed under the action of an external applied force the body completely returns to its initial condition on the removal of the force.

- Dynamics -
**sanjeev kumar**, Monday, August 6, 2012 at 8:37amtrue or false

a)a rigid body is an idealization of the behaviour of a body.

b)A GEO stationary satelite follows a circular orbit at a unique and has a time period of 24th.

c)constancy of areal velocity for a central force motion of a particle does not imply that the angular momentum is conserved

d)every planet moves in an orbit which is an ellipse with the sun at one focus

e)for perfectly elastic central impact the two bodies must move stuck together onlu if the impact is direct

- Dynamics -
**sanjeev kumar**, Monday, August 6, 2012 at 8:51amfill in the blanks----

a)the power developed by a force is ______ and that of couple is _______.

b)the velocity of cylinder which is released from rest on 0 degree incline after it has rolled through a distance l is given.

c)the conditions for non slipping is_______.

c)the direction of coriolis acceleration is obtaind by ______.

d)the action of a spring on a movable body to which it is attached is a common example of ________.

- Dynamics -
**Kiran**, Monday, July 22, 2013 at 10:49pmtrue or false

a)a rigid body is an idealization of the behaviour of a body.

b)A GEO stationary satelite follows a circular orbit at a unique and has a time period of 24th.

c)constancy of areal velocity for a central force motion of a particle does not imply that the angular momentum is conserved

d)every planet moves in an orbit which is an ellipse with the sun at one focus

e)for perfectly elastic central impact the two bodies must move stuck together onlu if the impact is direct

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