college physics

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Two cars of equal mass are traveling as shown in the figure below just before undergoing a collision. Before the collision, one of the cars has a speed of 19 m/s along +x, and the other has a speed of 31 m/s along +y. The cars lock bumpers and then slide away together after the collision. What are the magnitude and direction of their final velocity?

  • college physics -

    Momentum is conserved (always).
    Final Vx = 9.5 m/s (for equal masses)
    Final Vy = 15.5 m/s (for equal masses)

    Use the Pythagorean theorem for magnitude.
    Direction = arctan 31/19 = 58.5 degrees from +x axis, towards +y

  • college physics (simple electronics) -

    The electronic flash attachment for a camera contains a capacitor for storing the energy used to produce the flash. In one such unit, the potential difference between the plates of a 775 µF capacitor is 330 V.

    (a) Determine the energy that is used to produce the flash in this unit.

    (b) Assuming that the flash lasts for 5.0*10^-3 s, find the effective power or "wattage" of the flash.

    So far:
    0.000775 Farads= Coulumbs / 330V
    Coulumbs=0.25575C

    Now here I'm not sure what to do next.

    But I push on:
    1A=1C/s

    So:
    0.25575C/5x10^-3s=51.15A

    P=IV

    P=51.15A*330V=16879.5W

    But, that answer is kicked backed as wrong, and I'm not quite sure how to go about part A.

  • college physics -

    oops. sorry. messed that up didn't i?

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