1. A pitcher throws a 0.25 kg ball of clay at a stationary 3.0 kg block of wood.

Question

1. A pitcher throws a 0.25 kg ball of clay at a stationary 3.0 kg block of wood. The clay sticks to the wood on impact. The joint speed of the combined mass (clay plus wood) is 2 m/s. Calculate the original speed of the clay.

2. The plucky criminalists of CSI (Crime Scene Investigations) find an unknown substance at the scene of a grisly murder.  Careful measurement gives the mass as 0.272 kg and the volume as 0.00002 cubic meters.  This mystery substance is:

Uraniam, Seawater, Mercury, or Gasoline?

3. What is the pressure at the bottom of a swimming pool which is 12ft deep and contains fresh water?

748.8 lb per sq feet, 144 psi, 16 psi, or 62.4 ib per sq feet

Please show how you got your answers so i can see the formula please.

Explanation / Answer

1) mv = (M+m) v

v = 3.25*2/0.25=26 m/s

2) density = 0.272/0.00002=13600 kg/m^3 so its uranium

3) P = P0 + rho g h = 1.013E5 Pa + 1000*9.81*3.66=137204.6 Pa = 19.9 psi

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