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n balls each of mass m impinge elastical...

n balls each of mass m impinge elastically each second on a surface with velocity u. The average force experienced by the surface will be

A

`"mnu"`

B

`2"mnu"`

C

`4"mnu"`

D

`"mnu"//2`

Text Solution

Verified by Experts

The correct Answer is:
B
`F_(avg)=ma,a=(v-u)/(t)`
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Knowledge Check

  • n small balls, each of mass m and velocity u strike elastically on a surface per second. The force exerted on the surface

    A
    2mnu
    B
    2mu
    C
    `(2"mu")/n`
    D
    mnu

  • A gun fires N bullets per second, each of mass m with velocity v. The force exerted by the bullets on the gun is :

    A
    vNm
    B
    `(mv)/(N)`
    C
    `mvN^(2)`
    D
    `(mv^(2))/(N)`

  • A ball weighing 10g hits a hard surface vertically with a speed of 5m//s and rebounds with the same speed The ball remains in contact with the surface speed The ball remains in contact with the surface for 0.01s The average force exerted by the surface on the ball is .

    A
    `100N`
    B
    `10N`
    C
    `1N`
    D
    `0.1N`
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