What is a closed system?

A. A system in which no work is done

B. A system that can exchange matter with its surroundings

C. A system that cannot exchange matter with its surroundings

D. A system in which no heat flows

In which situation is chemical energy being converted to another form of energy? A. A lamp plugged into the electric grid. B. A fluttering flag. C. A floating wooden log. D. A burning candle.

A drag racer leaves the starting line and increases its speed up to 200 miles per hour by the time it crosses the finish line. What must have changed? A. only its speed B. only its velocity C. both its speed and its velocity D.

Which of the three substances has the greatest permeability? a. gravel b. sand c. silt d. all are equal?

Physical science tries to a. Survey all of science b. Describe the environment and interaction between living things c. Describe matter and energy and the relationship between matter and energy d. Describe rocks minerals and resources

A metal ball with diameter of a half a centimeter and hanging from an insulating thread is charged up with 1010 excess electrons.

Do different volumes of water have the same density? Why or why not?

Suppose you increase your walking speed from 4 m/s to 12 m/s in a period of 1 s. What is your acceleration?

If a wave is traveling at a constant speed, and the frequency decreases, what would happen to the wavelength? A) It would increase B) It would decrease C) It would remain constant D) It would drop to zero

What conditions lead you to see an absorption line spectrum from a cloud of gas in interstellar space?

A car travels 35.0 mph north for 1.00 hour, then 40.0 mph east for 0.0500 hour, and finally 50.0 mph northeast for 2.00 hours. Calculate the average speed.