Home
Class 11
PHYSICS
Block A has a weight of 300 N and block ...

Block `A` has a weight of `300 N` and block `B` has weight `50 N`. Calculate the distance `A` must descent form rest before it obtains a speed of `4 m//s` (Neglect the mass of cord and pulleys). `(Take g =1 0 m//s^(2))`.
.

Text Solution

Verified by Experts

The correct Answer is:
`2`
`S_(A) = h` and `S_(B) = 2h , V_(A) = 4m//s , V_(B) = 8 m//s` From energy conservation decreases in `P.E` of `A` = Increase in `P.E.B+` Increase in `K.E` of both `A` and `B`
`300h = 50 xx 2h +(1)/(2) xx30 xx 4^(2)+(1)/(2) xx 5xx 8^(2)`
`300 h=100h + 240 + 160`,
`200 h = 400 , h = 2m`.
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • WORK POWER AND ENERGY

    NARAYNA|Exercise Level-VI (Single Answer)|31 Videos

  • WORK POWER AND ENERGY

    NARAYNA|Exercise Level-VI (Multiple Answer)|11 Videos

  • WORK POWER AND ENERGY

    NARAYNA|Exercise Level-V (Comprehension)|22 Videos

  • WORK , ENERGY & POWER

    NARAYNA|Exercise EXERCISE IV|43 Videos

Similar Questions

Explore conceptually related problems

Block A has a weight of 3000 N and block B has a weight of 500 N . Determine the distance that A must descend from rest before it obtains a speed of 2.5 m//s . Neglect the mass of the cord and pulleys. .

Block A has a weight of 3000 N and block B has a weight of 50 N . Coefficient of friction for A is mu_(k) = 0.2 . Determine the pseed of block A after moves 1 m down the plane, starting from rest. Negelect the mass of the cord and pulleys.

Knowledge Check

  • Block A weights 4 N and block B weights 8 N. The coefficient of kinetic friction is 0.25 for all surfaces. The force F to slide B at a constant speed, when A rests on B and moves with it, is

    A
    2 N
    B
    3 N
    C
    4 N
    D
    5 N

  • A body of mass 1 kg falls from rest through a distance of 200 m and acquires a speed of 50 m/s. Work done against friction of air is (Take g = 10 m//s^2)

    A
    700 J
    B
    1250 J
    C
    750 J
    D
    1960 J

  • A block of mass 50 kg slides over a horizontal distance of 1m. If the coefficient of friction between their surface is 0.2, then work done against friction is (take g = 9.8 m//s^(2) ) :

    A
    98 J
    B
    72 J
    C
    56 J
    D
    34 J

    • Similar Questions

    Explore conceptually related problems

    In figure calculate the linear acceleration of the blocks. Mass of block B= 8kg mass of disc shaped pulley =2kg (take g=10m//s^(2) )

    In the arrangement shown in figure m_(A)=4.kg and m_(B)=1.0kg . The system is released from rest and block B is found to have a speed 0.3m//s after it has descended through a distance of 1.m find the coefficient of friction between the block and the table. Neglect friction elsewhere. (Take g=10 m//s^(2) ). .

    If the system is released from rest, determine the speeds of both masses after B has moved 1 m. Neglect friction, the masses of pulleys and inextensible string.

    When the three blocks of masses M, 2M and 2M in the system are released from rest, they accelerate with a magnitude of 1 m/ s^(2) . What is the coefficient of kinetic friction between block on the table and the table top? (neglect the force of friction in the pulleys and take g =10 m/ s^(2) )

    In the arrangement shown in figure m_(A) = 4.0 kg and m_(B) = 1.0 kg. The system is released from rest and block B is found to have a speed 0.3 m/s after it has descended through a distance of 1m. Find the coefficient of friction between the block and the table. Neglect friction elsewhere. (Take g = 10 m/ s^(2) )

    Home
    Profile