You stand on a spherical, airless asteroid that you know has a radius of 65 km. When you drop a feather, it falls 45 cm in the first second of fall. What is the mass of the asteroid?.

John throws .4 kg ball with velocity of 18 m/s. hits .2 kg bottle and bottle flies 25 m/s. how fast is ball traveling after hitting the bottle?

Unpolarized light of intensity so passes through two sheets of polarizing material whose transmission axes make an angle of 60∘ with each other as shown in the figure. what is the intensity of the transmitted beam, st?

If a simple machine reduces the strength of a force, what must be increased?