What is the density of a rock with a mass of 10 grams and a volume of 5 ml

By what factor does the drag force on a car increase as it goes from 65 to 110 km/h?

According to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does maria's voyage take according to samir?

Matter that emits no light at any wavelength is called