An open system is a system in which both matter and energy are exchanged with the surroundings.

a. true

b. false

When a candle is lit, the wick burns, the wax melts, the candle changes shape, and the air around the candle heats up. Which of the following is an example of a chemical change? A. the wick burning B. the wax melting C. the candle changing shape D.

What is the momentum of a 546,540 kg train that is travelling at 7.8 m/s

Which pieces of information would be least useful in determining if a science article is credible? A. the date that the article was published B. the type of organization that published the article C. the age of the author D.

The temperature - 273°C is -. O A. - 40°C O B. OK O C. the temperature at which all motion is at a minimum O D. absolute zero

When the kinetic energy of particles in a substance decreases, what also decreases? 93 The size of the particles in the substance. The number of particles in the substance. The substance's specific heat. The substance's temperature.

A car slows down from 24 m/s to rest in a distance of 90 m. what was its acceleration, assumed constant? incorrect: your answer is incorrect. m/s2

Radar, the first link in the cosmic distance chain, is used to establish the baseline distance necessary for the second link, parallax. What baseline distance must we know before we can measure parallax?

What types of areas are more prone to floods?

would the phases of the moon be affected if the moon didn't make one rotation for each revolution of earth?

What kinetic energy has 1 tone car traveling at 15 m/s