What forces causes a star to form from a nebula?

Which quantities are scalars? choose all that apply a.distance b.speed c. acceleration d.velocity

Based on this activity, is kinetic energy always transformed into potential energy?

The flame produced by the burner of a gas (propane) grill is a pale blue color when enough air mixes with the propane (c3h8) to burn it completely. for every gram of propane that flows through the burner, what volume of air is needed to burn it completely? assume that the temperature of the burner is 195.0°c, the pressure is 1.05 atm, and the mole fraction of o2 in air is 0.210.