An object with a mass of 100 kg is dropped from a height of 20 m. if the velocity of the object before hitting the ground is 15 m/s, is there a loss of energy in the form of heat? if so, how much? assume, g= 9.8 m/s^2

In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. which postulate of kinetic molecular theory best explains how this is possible? a. attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly. b. collisions between gas particles are elastic; there is no net gain or loss of kinetic energy. c. gases consist of a large number of small particles, with a lot of space between the particles. d. gas particles are in constant, random motion, and higher kinetic energy means faster movement.

How many molecules of sucrose c12h22o11 are there in 454 grams of sucrose

Alarge marble is dropped in a graduated cylinder with 35ml of water in it. the water level increases to 49ml. what is the volume of the marble