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A bullet is fired into a wooden block. I...

A bullet is fired into a wooden block. If the bullet gets embedded in wooden block, then

A

momentum alone is conserved

B

kinetic momentum and kinetic energy are conserved

C

both momentum and kinetic energy are conserved

D

neither momentum nor kinetic energy are conserved

Text Solution

Verified by Experts

The correct Answer is:
A
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A bullet gets embedded in a wooden block. Where does its KE go?

A large block of wood of mass M=5.99 kg is hanging from two long massless cords. A bullet of mass m=10 g is fired into the block and gets embedded in it. The (block + bullet) then swing upwards, their centre of mass rising a vertical distance -9.8 cm before the (block+bullet) pendulum comes momentarily to rest at the end of its arc. The speed of the bullet just before collision is : (take g=9.8 ms^(-2))

Knowledge Check

  • A bullet of mass A and velocity B is fired into a wooden block of mass C. If the bullet geta embedded in the wooden block.then velocity of wooden block after collision

    A
    ` (A+B)/(AC)`
    B
    ` (A+C)/(B+C)`
    C
    ` (AC)/(B+C)`
    D
    ` (AB)/(A+C)`

  • A bullet of mass m moving with a speed v strikes a wooden block of mass M & gets embedded into the block. The final speed is

    A
    `sqrt((M)/(M+n))V`
    B
    `sqrt((m)/(M+n))V`
    C
    `(m)/(M+n) V`
    D
    `V/2`

  • Assetion :when a bullet is fired from a gun the bullet preces a wooden block and stops changing the temperature of the bullte and the surrounding layers opf ood. Reason : Temperature is related to the energy of motion of the bullet as a whole.

    A
    If both assetion and reason are true and reaasons is the correct expanation of assetion
    B
    If both assetion and reason are tur but reason is not the correct explanation of assetion
    C
    If assertion is true but reason is false
    D
    If both assertion and reason are false.

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