physics-mechanics-collisions,momentum, impulse

posted by .

You are at the controls of a particle accelerator, sending a beam of 2.40×107 protons (mass ) at a gas target of an unknown element. Your detector tells you that some protons bounce straight back after a collision with one of the nuclei of the unknown element. All such protons rebound with a speed of 2.10×107 . Assume that the initial speed of the target nucleus is negligible and the collision is elastic.


1)Find the mass of one nucleus of the unknown element. Express your answer in terms of the proton mass m

2)What is the speed of the unknown nucleus immediately after such a collision?

  • physics-mechanics-collisions,momentum, impulse -

    Momentum:
    p is mass of a proton
    M is the mass of the nuclei

    p*2.4E7=Mv' + p(-2.1E7)
    KEnergy:
    1/2 p (2.4E7)^2=1/2 M v'^2 + 1/2 p (-2.1E7)^2

    Two equations, two unknowns: Let algebra go to work. Solve for v' in the first equation in terms of M
    then, put that expression for v' into the second equation. It will work out.

  • physics-mechanics-collisions,momentum, impulse -

    so : v' = 7.52679E-20/M?

  • physics-mechanics-collisions,momentum, impulse -

    and, M= 5.66525677E-39
    V' = 7.52679E-20/5.66525677E-39

    is this correct???

  • physics-mechanics-collisions,momentum, impulse -

    and, M= 5.66525677E-39
    V' = 7.52679E-20/5.66525677E-39 = 1.328587618E19

    is this correct???

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Physics

    Each of the protons in a particle beam has a kinetic energy of 3.05 10-15 J. What are the magnitude and direction of the electric field that will stop these protons in a distance of 1.15 m?
  2. Physics HELP!

    You are at the controls of a particle accelerator, sending a beam of 3.90×10^7 m/s protons (mass m ) at a gas target of an unknown element. Your detector tells you that some protons bounce straight back after a collision with one …
  3. chemistry

    A proton beam is made by accelerating protons in a high voltage electric field. The protons have a velocity of 2.75 x 107 m/s. What is the wavelength of the protons traveling at this very high speed?
  4. mc questions

    Question # 1-What is the magnitude of the momentum of a particle of mass 2 kg with a speed of 5 m/s?
  5. physics- MC QUESTION!

    Question: A particle is initially traveling to the right when it hits a wall and turns around to the left. The momentum after the collision is less than the initial momentum. a-the impulse on the particle is to the right b-the impulse …
  6. physics

    A beam of protons is moving toward a target in a particle accelerator. This im trying to study for my exam by doing problems, however im stuck with this one. any help is appreciated beam constitutes a current whose value is 0.39A. …
  7. physics-mechanics-collisions,momentum, impulse

    You are at the controls of a particle accelerator, sending a beam of 2.40×107 protons (mass ) at a gas target of an unknown element. Your detector tells you that some protons bounce straight back after a collision with one of the …
  8. physics-mechanics-collisions,momentum, impulse

    You are at the controls of a particle accelerator, sending a beam of 2.40×107 protons (mass ) at a gas target of an unknown element. Your detector tells you that some protons bounce straight back after a collision with one of the …
  9. physics

    In a certain particle, a current of 0.50 mA is carried by a 5.0MeV proton beam that has a radius of 1.5 mm. Find the density of protons in the beam.if the beam hits a target, how many protons hit the target in 1.0s.
  10. AP Physics - collisions?

    Two steel balls collide and bounce apart in an isolated system. If the final kinetic energy is less than the initial kinetic energy, what of the following is true?

More Similar Questions