#4 You are trying to determine the density of a rock that you found outside. First you measure the mass and find that the rock is 6g. You then find the volume of the rock and see that it is 24cm3. What is the density of the rock?

#5 A Hot Wheels car has a density of 1.2g/cm3 and has a mass of 60g. What is the car's volume?

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.