MY CART (5)

Use Coupon: CART20 and get 20% off on all online Study Material

ITEM
DETAILS
MRP
DISCOUNT
FINAL PRICE
Total Price: Rs.

There are no items in this cart.
Continue Shopping
Menu
Grade: 12
        

1307_24875_IMG_0291.JPG


i want the answer of question 1.247


i am confused on how to find acceleration of the block m2...?


thanks

7 years ago

Answers : (2)

vikas askiitian expert
509 Points
							

let the accletation of thread is a...

accleration of m1 , m2 & the point where thread touches the disk is same a...

accleration of center of mass of disc is zero....

now let tension bw m & m2 be T2  &  bw m & m1 be T1 then

at m2

 m2g - T2 = m2a                       ..........1

at m1

T1 - f = m1a                           ............2                             (f is friction force)

at pulley

        (T2 + m2g - T1)R = I(alfa)                               (net torque = I(alfa))

        T2 - T1 + m2g = ma/2              ..................3                      {I (disc) = mR2/2 , R is radius of disc}

adding 1 & 2 then substituting T2-T1 in eq 3 we get

a = 2(2m2g - f)/{2(m1+m2)+m}                                       {f is friction force  = km1g }

a = 2g(2m2 - km1)/{2(m1+m2)+m}

 

 

 

7 years ago
Fawz Naim
37 Points
							

Let the tension in the string be T. The force of friction opposes motion of the mass m1. Therefore the work done by the frictional force will be negative. Let the acceleration of the system be 'a'. Now applying newton's second law of motion. 'f' is the force of friction acting between the mass m1 and the horizontal plane

m2g-T=m2a ....1

T-f=m1a ....2  where f=kN  (N is the normal reaction which is equal to th e weight of m1,  N=m1g)

solve the two equations and calculate the value of 'a' in terms of m1,m2,g and k

now we have the value of acc. a

the work done by the frictional force on the mass m1=Force of friction * displacement(S)

after time t, the displacement of the mass m1 is

S=1/2*a*t^2     (second equation of motion)

put the value of 'a' and calculate the value of S

now calculate the work done by the frictional force and put a negative sign.

7 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies

Get Extra Rs. 551 off

COUPON CODE: SELF20


Course Features

  • 101 Video Lectures
  • Revision Notes
  • Previous Year Papers
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Test paper with Video Solution


Course Features

  • 110 Video Lectures
  • Revision Notes
  • Test paper with Video Solution
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions


Get Extra Rs. 594 off

COUPON CODE: SELF20

Ask Experts

Have any Question? Ask Experts

Post Question

 
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!! Click Here for details