College Physics

posted by .

A 7.00 g bullet, when fired from a gun into a 1.00 kg block of wood held in a vice,
penetrates the block to a depth of 8.00 cm. If the block had instead been at rest on a
frictionless horizontal surface, to what depth would the bullet have penetrated?

  • College Physics -

    In a frictionless mount, momentum would have been conserved.

    Vfinal for both would be given by
    0.007 Vbullet = (1.007)Vfinal
    Vfinal = 0.00695 Vbullet

    The bullet kinetic energy loss would be
    0.99305^2 = 0.986 of the value lost in the clamped block.

    Assume penetration depth is proportional to kinetic energy loss. This would be true if the stopping force were constant.

    The penetration depth would then be 7.89 cm.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    A gun is fired vertically into a 1.55 kg block of wood at rest directly above it. If the bullet has a mass of 21.0 g and a speed of 190 m/s, how high will the block rise into the air after the bullet becomes embedded in it?
  2. Physics

    A .22 rifle bullet, traveling at 373m/s, strikes a block of soft wood, which it penetrates to a depth of 0.125m. The block of wood is clamped in place and doesn't move. The mass of the bullet is 1.90. Assume a constant retarding force.How …
  3. physics lab

    A bullet is shot into a block of plastic. The bullet penetrates the block 0.75 m. The mass of the bullet is 8 g. It is traveling with a speed of 410 m/s before it hits the block. A Use kinematic equations to find the magnitude of the …
  4. Physics help please

    A 13.2 gm bullet is fired into a 12.0 kg wood block that is at rest on a wood table. The block, with the embedded bullet, slides 5.00 cm across the table. Assuming that the local acceleration due to gravity is 9.80m/s2 and that the …
  5. Physics

    A 10-g bullet is shot vertically into a stationary 8-kg block. The block lifts upward 3.0 mm. The bullet penetrates the block in a time of .001 seconds. Assume the force exerted on the block is constant. What is the impulse imparted …
  6. Momentum

    A 4.4 g bullet is fired into a block of wood with a mass of 21.3 g. The wood block is initially at rest on a 1.3 m tall post. After the collision, the wood block and bullet land 2.4 m from the base of the post. Find the initial speed …
  7. Physics

    1. A bullet of 0.0500 kg is fired into a block of wood. Knowing that the bullet left the gun with a muzzle velocity of 350. m/s, and the bullet penetrates .15 m into the block of wood, determine: a) The average force required to stop …
  8. University Physics

    A 8.3-g bullet, when fired from a gun into a 1.1-kg block of wood held in a vise, penetrates the block to a depth of 7.05cm. This block of wood is next placed on a frictionless horizontal surface, and a second 8.3-g bullet is fired …
  9. pHysics !!

    A 20-g bullet is fired horizontally into a 980 g block of wood suspended by a long cord. The bullet sticks in the block and causes the block to swing 15 cm above its initial level. a) What is the momentum of the bullet before it hit …
  10. Physics

    A gun is fired vertically into a 1.60 kg block of wood at rest directly above it. If the bullet has a mass of 21.0 g and a speed of 195 m/s, how high will the block rise into the air after the bullet becomes embedded in it?

More Similar Questions