1800-150-456-789
FlagBACK
Flag Mechanics> problem...
question mark

a small block b is placed on a block a of mass 5kg and lenght 20cm.initially block b is near the right end of block a.a constant horizontal force of 10newton is applied on block aall the surfaces are assumed frictionlessfind the time elapsed before the block b seperates from block aplz help me

omkar deepak borkar , 14 Years ago
Grade 10
anser 2 Answers
vikas askiitian expert

Last Activity: 14 Years ago

let the mass of block b is mb....

force on lower block is F=10N....

accleration of system is a...

    (mb+5)a = 10

         a= 10/(mb+5) m/s2

now a seudo force acts on the upper block in opposite direction and its magnitude is f=(mb)a...

 due to this force block moves in opposite direction with accleration a1....

   mba1=mba

      a1=a=10/(5+mb)

when the block covers a distance of 20cm then it separates out...

   0.2 = a1t2/2

   t2  =  (0.4/a1)=[0.04(5+mb)]

   t=  0.2(5+mb)1/2

Sayan

Last Activity: 7 Years ago

The block A will accelerate under the force 10 N applied on it. But the surfaces being frictionless, block B will remain stationary. Soblock B will separate from block A when block A has travelled a distance s equal to its length i.e. 20cm.For block A:u=0 m/s; a=Force/Mass=10/5=2NSo, v²=√(u²+2as)v=√2as=√(2*2*0.2)=0.894 m/sTherefore, v=u+at0.894=0+2t=>t=0.447 sec=0.45 sec

Provide a better Answer & Earn Cool Goodies

Enter text here...
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


Ask a Doubt

Get your questions answered by the expert for free

Enter text here...

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 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 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 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 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^2Find the acceleration of block B
mechanics
1 Answer Available

Last Activity: 2 Years ago