A scientist observes and records data for the force of gravity between a star and a few different-sized planets. The planets are all the same distance from the star. Which graph best represents the strength of the gravitational force between the planets and the star?

What is the angular momentum of the bar about the axle?

Aprisoner is forced to go into one of three rooms, but he can choose which room. the first room is ablaze with fire. the second one is rigged with explosives that will go off as soon as he enters. the third contains a pair of lions who haven't eaten in years. which room should he choose to survive?

The molecular mass of a gas is (select all that apply) a. independent of the type of gas b. the same number as the atomic (or molecular) mass, but measured in grams c. dependent on the temperature d. the mass of a mole of the gas