5.) If I have a block of plastic that is 5.51 cm long, 8.23 cm wide, and 1.22 cm high, how much does the block weigh if it has a density of 1.75 g/cm³?
6.) Proxima Centauri, the star closest to our solar system, is 4.02x10^13 km away. If we were to travel at the speed of light, 3.0x10^8 meters/s, how long would it take our ship to get there? What if we traveled at the rate of a jet airliner – 589 miles/hour?
7.) If you have 3.31 moles of Uranium, how many atoms of uranium would you have? How many grams would you have? In one mole, there are 6.02x10^23 atoms. 1 mole of Uranium weighs 238 grams.