Which of these is a pure substance?

A. cake mix

B. ocean water

C. 10 carat gold

D. solid gold

A roadway for stunt drivers is designed for racecars moving at a speed of 40 m/s. A curved section of the roadway is a circular arc of 230 m radius.

Apply Newton's first law to each of the following situations. In which situations can you conclude that the object is undergoing a net interaction with one or more other objects? A book slides across the table and comes to a stop.

Where do subduction zones often occur

Which of the following statements correctly describes the models put forth by Ptolemy and Copernicus to explain the universe? A. The model developed by Copernicus was simpler and had less inconsistencies than Ptolemy's model. B.

1. Why didn't Sucheng Chan go to school until she was eight

A flash of white light containing all the colors of the visible spectrum in air shines straight down on the surface of a pool.

A car accelerates uniformly from 0 to 15m/s in 5 s. Calculate acceleration.

Which device would a sleep researcher use to monitor a sleeping person's brain waves?

An experiment is performed to obtain the value of a physical property. If the true (i. e., correct) value of the property is 50 and the measured (i. e., experimental) value is 32, the percent error of the experimental result is:

White moths were found in huge numbers in the city of Birmingham. These moths could be easily camouflaged by the trees. Because of sudden industrial development, the trees in the city were covered with soot.