Which of the following is a chemical reaction? A. A spoon bending B. Wood burning C. Plates being stacked D. A book being opened

Which of the following statements best describes the second law of thermodynamics? A. Heat flows spontaneously from hot to cold, and entropy decreases. B. Heat flows spontaneously from hot to cold, and entropy increases. C.

G Under what energy circumstances does an electron tunnel through a potential barrier?

What is glacial activity considered small large or small

Motion combines the concepts of position change (length) and time. Which of the following combination of units is used to describe the velocity of a moving object? length x time length/time Length/time^2 time/length

What is the definition for relative motion

In which galaxy is our solar system located? a. milky way b. ngc 4414 c. andromeda d. small magellanic cloud

Two astronauts, of masses 60 kg and 80 kg, are initially right next to each other and at rest in outer space. They suddenly push each other apart. How far has the heavier astronaut moved when the lighter astronaut has moved 12 m

A person suffering from anaemia gets tired

Jessica took a Mylar balloon outside on a very hot day. As she waited for the bus the balloon began to get bigger. What is the best explanation of this?

Describe how electricity flows through a simple closed circuit.