Recent content by armin y

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    firtst year university physics?

    A stream of 106 one microgram ping pong balls per second are uniformly incident on a circular area of radius 5 cm. The balls have a speed of 50 cm/sec. Estimate the pressure exerted on the circular area assuming the balls bounce off with their velocity unchanged
  2. A

    first year university physics?

    The number of Motor vehicle deaths can be estimated assuming they are linearly related to the kinetic energy of the vehicles in the accident. What effect on the number of fatalities would occur if the average speed on the highway increases by 20% while the car mass increases by 10%? (Note that...
  3. A

    first year university physics?

    A 250 gm block dropped onto a relaxed vertical spring that has a spring constant of 250 Nt/m. The block becomes attached to the spring and compresses the spring 12 cm before momentarily stopping. a) What is the speed of the block just before it hits the spring? Neglect friction. b) If the speed...
  4. A

    First year university physics?

    A 2 gm ball travelling 5 cm/sec hits a 3 gm ball and sticks to it. a) What is the velocity of the combined 5 gm ball? b) What is the kinetic energy before the collision? c) What is the kinetic energy after the collision? d) Can you suggest what happened to the energy?
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