Three weights on on an exercise mat; they have masses of 200 kg, 50 kg, and 100 kg. Which would have the most inertia according to Newton's First Law of Motion.

Cathy is pedaling down a steep hill on her bicycle and wants to be able to coast up the next hill, which is 25 meters high, without pedaling. cathy and her bicycle have a mass of 75 kg. assuming her bicycle is 100% efficient, what would her speed have to be?

The two stars in a certain binary star system move in circular orbits. the first star, alpha, has an orbital speed of 36 km/s. the second star, beta, has an orbital speed of 12 km/s. the orbital period is 137 d. a) what is the mass of the star alpha? b) what is the mass of the star beta?

If the specific heat of a metal is 0.850 j/g °c, what is its atomic weight?