Which of the following is important to gbellringer #13. Which of the following is important to generating heat? A. Friction
B. Chemical reactions
C. Sunlight
D. All of the above

Sugar is dissolved in water. which is the solute? sugar neither both water

Nebulae are enormous clouds in outer space. they are made mostly of hydrogen gas, helium gas, and dust. some nebulae glow brightly, while others do not. the stars that people see are huge, bright balls of glowing gas. they are made mostly of hydrogen and helium. which statement correctly describes other ways in which nebulae and stars are different? a. stars can form inside a nebula but a nebula can never be produced by any star. b. a star always has a higher density than a nebula. c. stars can never form inside a nebula but a nebula can be produced by any star. d. a nebula always has a higher density than a star.

Ajet plane is speeding down the runway during takeoff. air resistance is not negligible. identify the forces on the jet.