An unknown substance has a mass of 15 g and a volume of 4 cm3. Calculate the density of the unknown substance.

A computer technician always touches the metal body of a computer before touching any of its electrical parts. why?

Sound travels about four (4) times faster in water than it doss in air. If the speed of sound in air is 343 m/s, how long would it take sound to travel five (5) miles under water? Express answer in seconds.

In what way does elevation affect climate? A. Air at higher elevations is more dense, and therefore it holds less heat. B. Air at higher elevations is less dense, and therefore it holds more heat. C.

If a plane was flying at a speed of 400 km / hr and 2 min later has slowed to 100 km/hr to land what is the acceleration

During a phase change, the temperature of a substance A. increases. B. decreases. C. does not change. D. increases or decreases.

Where would a car traveling on a roller coaster have the most potential energy At the bottom It's always the same At the top Halfway to the top

Is a magnetic reversal a threat to life on Earth? Whay do you say?

What are the adaptions of the tundra

Based on the number of valence electrons, what is the correct formula when nitrogen bonds to hydrogen? A) NH2 B) NH3 C) NH4 D) N2H

Choose the correct statement about the currents through the elements. Choose the correct statement about the currents through the elements. The currents in series-connected elements are not the same and depend on a current or a voltage source.