suppose you want to move a big rock in your yard. It is about waist high and 4 feet long, has a volume of 1.2m^3 and a density of 2.5g/cm^3. How much does it weigh, in units of lbs?

What was the procedure by which case united states vs lopez went to court

A100-watt light bulb radiates energy at a rate of 100 j/s. (the watt, a unit of power or energy over time, is defined as 1 j/s.) if all of the light emitted has a wavelength of 525 nm , how many photons are emitted per second?

Write the empirical chemical formula of calcium with a mass percent of 38.8, phosphorus with a mass percent of 20.0, and oxygen with a mass percent of 41.3.