Physics..help please

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A rifle with a weight of 35 N fires a 4.0 g bullet with a speed of 250 m/s.

(a) Find the recoil speed of the rifle.

___m/s

(b) If a 700 N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle.

___m/s

  • Physics..help please -

    Ah, do this the same way we did the guy on skates.

  • physics -

    I need help with the same question but different numbers. how do you solve it?

  • Physics..help please -

    Go look at the last problem I did with jake, wait a sec and I will copy it here, conservation of momentum with zero before the shot.

  • Physics..help please -

    A 715 N man stands in the middle of a frozen pond of radius 10.0 m. He is unable to get to the other side because of a lack of friction between his shoes and the ice. To overcome this difficulty, he throws his 1.2 kg physics textbook horizontally toward the north shore at a speed of 10.0 m/s. How long does it take him to reach the south shore?

    * Physics..help please - Damon, Wednesday, October 6, 2010 at 3:51pm

    first find his mass in kilograms
    m = 715 / 9.81

    then use conservation of momentum
    (total of 0 before the toss)
    0 = (715/9.81) v - 1.2 * 10

    solve for v
    how long does it take to go 10 meters at v meters/second?

  • Physics..help please -

    I still can't figure it out with this question. i get the one you did with jake but not this one.

  • Physics..help please -

    A rifle with a weight of 35 N fires a 4.0 g bullet with a speed of 250 m/s.

    (a) Find the recoil speed of the rifle.

    ___m/s
    ------------------------------
    All is still. Momentum = 0
    A shot rings out.
    The rifle goes left, the bullet goes right.
    Momentum is STILL zero (no outside forces)
    m rifle = 35/9.8
    m bullet = .004
    so
    0 = -(35/9.8) v + .004 * 250

  • Physics..help please -

    for the second part add the mass of the man (700/9.8) to the mass of the rifle and repeat the calculation

  • Physics..help please -

    A bullet is shot from a rifle aimed horizontally at the same time a bullet is dropped from the same height as the gun's barrel. Which bullet hits the ground first?

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