Gold has a density of 19.3 g/mL. I have a metal sample that I was told was pure gold. It has a mass of 391.9 grams and a volume of 44.7 mL. Is this a pure sample of gold? Explain your answer.

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation:   if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

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(jacemorris04)