physics

posted by .

A 3.1-kilogram gun initially at rest is free to move. When a 0.015-kilogram bullet leaves the gun with a speed of 500. meters per second, what is the speed of the gun?

  • physics -

    This a chance for you to apply the law of conservation of momentum.

    That means the momentum of the gun going backward is equal and opposite to the momentum of the bullet going forward. The two momenta cancel out.

    Mbullet*Vbullet = -Mgun*Vgun

    Solve for Vgun

  • physics -

    7.5 m/s

  • physics -

    pbefore=pafter
    m1v1+m2v2 = m1v’1+m2v’2
    (3.1kg)(0m/s)+(0.015kg)(0m/s) =
    (3.1kg)( v’1)+(0.015kg)(500.m/s)
    0kg∙m/s=(3.1kg)( v’1)+7.5kg∙m/s
    -7.5kg∙m/s=(3.1kg)( v’1)
    v’1=-2.4m/s (its speed is 2.4 m/s)

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. phys

    A 5g bullet is fired from a 5000g gun. If the bullet leaves the gun going +800m/s, with what speed does the gun recoil?
  2. Physics

    a 10 kg gun recoils with a speed of 0.1 meter per second as it fires a 0.001kg bullet. what is the speed of the bullet as it leaves the gun
  3. emu

    a bullet of mass ..21kg is fired from a gun of a mass 5.6kg. if gun is recoiled at a speed of 2.5 m/s .What speed must the bullet have as it leaves the gun
  4. physics

    A 0.0309-kilogram ball is stuffed into a spring gun and shot up into the air at some angle. The gun's spring has a force constant of 92.5 N/m and is initially compressed 0.138 m. When the ball reaches maximum height, it has a horizontal …
  5. physics

    A 5g bullet is fired from a 5000g gun. If the bullet leaves the gun going +800m/s, with what speed does the gun recoil?
  6. Physics

    A gun converts 200J of stored energy into kinetic energy of the 0.02kg bullet. What is the speed of the bullet as it leaves the gun?
  7. physics

    a gun converts 200J of stored energy into kinetic energy of the 0.02kg bullet. What is the speed of the bullet as it leaves the gun?
  8. physics

    a gun converts 200J of stored energy into kinetic energy of the 0.02kg bullet. What is the speed of the bullet as it leaves the gun?
  9. delta prep (physics)

    A 0.27 kf bullet is fired from a 4.1kg gun the bullet leaves the gun at a speed of 200m/s what os the recoil speed of the gun
  10. Physics

    A 30-gram bullet leaves a gun barrel with a speed of 230 m/s. (a) What work is done on the bullet while it is in the gun barrel?

More Similar Questions