science

posted by .

Explain why a bullet with a mass of 15 grams and a velocity of 400 m/s has more momentum than you at rest. Calculate the momentum for both.

  • science -

    momentum = mass x velocity.
    For you, velocity = 0; therefore, momentum is zero.

    For the bullet, it has mass AND velocity; therefore, it has momentum.

  • science -

    Explain how the energy (total, kinetic or potential) will change when you let an object to free-fall from the top of a building

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    An 8.0 g bullet is fired horizontally into a 9 kg block of wood and sticks in it.The block,which is free to move,has a velocity of 40cm/s after impact.Find the initial velocity of a bullet. You know the momentum (total mass) of the …
  2. 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?
  3. physics

    a 2 kilogram rifle initially at rest fires a 0.002 kilogram bullet. as the bullet leaves the rifle with a velocity of 500 meters per second, what is the momentum of the rifle bullet system?
  4. physics

    a 2.5 kg rifle fires a 20 g bullet at 400 m/s. What is the magnitude of the recoil velocity of the rifle?
  5. Science (Force and motion)

    Explain how acceleration can be slowing down. Calculate the impact force of a 50 kg object travelling at 100km/hr. (Momentum = mass x velocity) Calculate the momentum of a tennis ball of 50 g moving at a velocity of 25m/s.
  6. phycis

    a bullet of mass 0.01kg is fired into a sandbag of mass 0.49kg handing from atree.the sandbag with the bullet embedded into it swing away at 10m/s find: a.the momentum after collision b.the momentum before the collision c.the velocity …
  7. Physics

    A bullet of mass 10.6 grams is fired with a speed of 125 meters per second toward a wood block of mass 187 grams initially at rest on a very smooth (assume frictionless) surface. What is the change in momentum of the bullet if it becomes …
  8. physics

    Explain how it is possible for a motorcycle (mass = 250 kg) to have the same momentum as a locomotive engine (mass = 2,500 kg) i though momentum was directly proportional to mass so the more mass the more the momentum?
  9. Physics

    A bullet of mass 0.01kg Is fired into a sandbag of mass 0.49kg hanging from a tree. The sandbag, with the bullet embedded into it, swings away at 10m/s.find a)the momentum after collision b)the momentum before collision c)the velocity …
  10. Physics

    A bullet of mass 20gm penetrates a board of thickness 10cm and mass 1kg at rest. If the board is free to move,find the thickness to which the bullet will penetrate. I used conservation of momentum to find the combined velocity of bullet …

More Similar Questions