help@askiitians.com

1800-150-456-789

Mechanics> chapter 9 q. no.59 in second equation the...

question mark

chapter 9 q. no.59 in second equation there is an external friction force but we apply conservation of momentum how it is possible PLESE HELP

ritesh , 9 Years ago

Grade 12th pass

13 Answers

Neeti

Last Activity: 9 Years ago

which book? Could you attach a photo of your doubt?

ritesh

Last Activity: 9 Years ago

h c verma..........

ritesh

Last Activity: 9 Years ago

h c verma..........

ritesh

Last Activity: 9 Years ago

h c verma..........

Neeti

Last Activity: 9 Years ago

i’m still unable to find it :( could you be a little more specific?

ritesh

Last Activity: 9 Years ago

two blocks 1st is 2kg and 2^nd is 4kg separation b/w these 16cm. friction coeff. 0.2.the collision b/w the blocks is perfectly elastic .find separation b/w the two blocks when they come to rest

Neeti

Last Activity: 9 Years ago

Yeah it says that the collision is perfectly elastic so we’re supposed to conserve momentum but frictional force is there. have you tried the question by applying conservation of momentum? are you getting the correct answer?

ritesh

Last Activity: 9 Years ago

but mam as we study if there is external force(in these q friction) on the system then there is no conservation of momntum.

ritesh

Last Activity: 9 Years ago

please explain a little bit to get clear concept of conservation of momntum eq.

Neeti

Last Activity: 9 Years ago

Yes Yes i know that. i read a few articles and they state that DURING the collision, (while the collision is happening) , the time interval is very short. the collision happens very quickly so we can assume that $\Delta$ t is very small.

Now we know that F $\Delta$ t = $\Delta$ p.

since $\Delta$ t is very small, the $\Delta$ p transferred to the earth (due to friction) is negligible and can be ignored.

Neeti

Last Activity: 9 Years ago

i hope you got it :) feel free to ask any follow-up question :)

ritesh

Last Activity: 9 Years ago

thank you very very much. i got dT is very small.......thanku....

Neeti

Last Activity: 9 Years ago

You are most welcome :) if you have any other doubt, you can always ask. I’d be more than happy to help :)

Provide a better Answer & Earn Cool Goodies

Enter text here...

LIVE ONLINE CLASSES

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

Full Live Access

Study Material

Live Doubts Solving

Daily Class Assignments

Ask a Doubt

Get your questions answered by the expert for free

Enter text here...

question mark

A metal strip clamped at one end vibrates with a frequency of 20 Hz and amplitude of 5 mmat 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 Answer Available

Last Activity: 2 Year ago(s)

question mark

An object of mass m = 0.25 kg oscillates in a fluid at the end of a vertical spring of springconstant kH = 85 N/m, see Fig.1. The effect of the fluid resistance is governed by thedamping 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 Year ago(s)

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 Year ago(s)

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 Year ago(s)

question mark

If the acceleration of block A is 5 m/s^2Find the acceleration of block B

Mechanics

1 Answer Available

Last Activity: 2 Year ago(s)

View all Questions