A 500 kg crate is being lifted into a truck. If it moved for 1.5 meters, how muck work was done to lift the crate?

What process is believed to be responsible for the formation of the grand canyon? a) diverging tectonic plates b) converging tectonic plates c) erosion over a long period of time d) caving in of the ground due to erosion

How do astronomers measure the amount of dark matter in the universe

Which of the following types of stars had the smallest initial mass? which of the following types of stars had the smallest initial mass?