Physics- spring gun

posted by .

A spring gun is made by compressing a spring in a tube and then latching the spring at the compressed position. A 4.97-g pellet is placed against the compressed and latched spring. The spring latches at a compression of 3.92 cm and it takes a force of 9.12 N to compress the spring to that point.

If the gun is fired vertically, how fast (m/s) is the pellet moving when it loses contact with the spring?

  • Physics- spring gun -

    The spring constant is
    k = 9.12/0.0392 = 232.7 newtons/meter

    The potential energy stored in the compressed spring, when compressed a distance X is
    (1/2)kX^2 = 0.1788 newtons

    When fired vertically, the spring stops exerting a force on the spring when the compression force equals M g. (After that, contact is lost). Call the that position X'

    kX' = M g ; so X' = 0.0021 m

    At that point,
    Pellet kinetic energy + pellet gravitational energy change = spring potentialo energy change

    (1/2) M V^2 + Mg(X - X') = (1/2) k [X^2 - X'^2]

    Solve for V; check my thinking

  • Physics- spring gun -

    The first minus sign on the left should be a plus.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics - Spring gun

    A spring gun is made by compressing a spring in a tube and then latching the spring at the compressed position. A 4.87-g pellet is placed against the compressed and latched spring. The spring latches at a compression of 4.87 cm, and …
  2. College Physics

    1. A spring gun is made by compressing a spring ina tube and then altching the spring at the compressed position. A 4.97-g pellet is placed against the compressed and latched spring. The spring latches at a compression of 4.06 cm, …
  3. Physics

    A spring gun is made by compressing a spring in a tube and then latching the spring at the compressed position. A 4.97-g pellet is placed against the compressed and latched spring. The spring latches at a compression of 5 cm, and it …
  4. physics and guns

    A spring gun is made by compressing a spring in a tube and then latching the spring at the compressed position. A 4.97-g pellet is placed against the compressed and latched spring. The spring latches at a compression of [01] cm, and …
  5. physics

    A spring gun (k = 26 N/m) is used to shoot a 56-g ball horizontally. Initially the spring is compressed by 17 cm. The ball loses contact with the spring and leaves the gun when the spring is still compressed by 12 cm. What is the speed …
  6. physics

    The spring in the muzzle of a child's spring gun has a spring constant of 780 N/m. To shoot a ball from the gun, first the spring is compressed and then the ball is placed on it. The gun's trigger then releases the spring, which pushes …
  7. Physics

    A rifle fires a 2.25 10-2-kg pellet straight upward, because the pellet rests on a compressed spring that is released when the trigger is pulled. The spring has a negligible mass and is compressed by 8.37 10-2 m from its unstrained …
  8. physics

    A rifle fires a 1.27 x 10-2-kg pellet straight upward, because the pellet rests on a compressed spring that is released when the trigger is pulled. The spring has a negligible mass and is compressed by 7.87 x 10-2 m from its unstrained …
  9. physics

    A rifle fires a 1.27 x 10-2-kg pellet straight upward, because the pellet rests on a compressed spring that is released when the trigger is pulled. The spring has a negligible mass and is compressed by 7.87 x 10-2 m from its unstrained …
  10. physics

    A rifle fires a 1.27 x 10-2-kg pellet straight upward, because the pellet rests on a compressed spring that is released when the trigger is pulled. The spring has a negligible mass and is compressed by 7.87 x 10-2 m from its unstrained …

More Similar Questions