A billiard ball weighs 1.67 N. The ball's momentum reaches 10 kg m/s as it falls. How long did it take to fall?

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

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?

Aspring that is stretched 2.6 cm stores a potential energy of 0.053 j. what is the spring constant of this spring?