Which identifies that a chemical reaction has occurred?

Analyze how friction can be both a positive and negative aspect on our lives

You're still in a redecorating mood and want to move a 35kg bookcase to a different place in the living room. You exert 58 N on it which makes it move at 0.12 m/s^2. Find the coefficient of kinetic friction between the bookcase and the carpet

A person slaps her leg with her hand, which results in her hand coming to rest in a time interval of 2.75 ms2.75 ms from an initial speed of 4.75 m/s4.75 m/s.

When a wire is made smaller, the resistance increases. Which happens to the electric current? a) It decreases. b) It increases. c) It stays the same.

A (n) blank wave carries energy through space

Venus's average distance from the sun is 0.72 AU and Saturn's is 9.54 AU. Calculate the orbital velocity of Venus and Saturn around the sun. (The mass of the sun is 1.99 X 10^30 KG. an AU is 1.50 X 10^11 M.

Caleb's parent drove him to a swim meet 208 km away. It took them 2 hours, which included a 15-minute break to refuel. What was their average driving speed?

Why is thermal energy from the Sun transferred to Earth through electromagnetic waves instead of any other type of thermal energy transfer? Electromagnetic waves can carry energy through matter. Electromagnetic waves can travel through empty space.

Why do different elements emit different colors of light

In an experiment, 108 J of work was done on a closed system. During this phase of the experiment, 79 J of heat energy was added to the system. What was the total change in the internal energy of the system?