In a normal environment why does a bowling ball and feather hit the ground at different times when dropped from the same hight? A they don’t hit the ground at the same time B one is more dense than the other C one is heavier than the other D ari resistance

Which of the following best describes internal energy? a. the difference between the kinetic and potential energies of the particles in a system b. the sum of the kinetic and potential energies of the particles in a system c. the sum of the kinetic and thermal energies of the particles in a system d. the difference between the kinetic and thermal energies of the particles in a system

When a charged balloon sticks to a wall, the downward gravitational force is balanced by an upward static friction force. the normal force is provided by the electrical attraction between the charged balloon and the equal but oppositely charged polarization induced in the wall's molecules. if the mass of a balloon is 1.2 g, its coefficient of static friction with the wall is 0.71, and the average distance between the opposite charges is 0.80 mm, what minimum amount of charge must be placed on the balloon in order for it to stick to the wall? express your answer to two significant figures and include appropriate units.

Aruby has a density of 3.9 g/cm³. what is the mass of the ruby, if its volume is 5 cm³? a. 0.78 g b. 1.28 g c. 8.9 g d. 19.5 g