Substances that allow athletes exercise longer are called

A. drugs

B. carbohydrates

C. proteins

D. ergogenic aids

Oliver builds a circuit connecting a light bulb to a battery with wires, leaving a gap in one of the wires. He places several objects across the gap to close the loop.

Which two elements have the same number of valence electrons? a. Barium b. Silicon c. Neon d. Carbon?

The reason an astronaut in an earth satellite feels weightless is that

According to John Locke, primary qualities of an object are what? A. innate ideas to the mind B. intrinsic features of objects of reality C. dependent on an observer D. none of the above

How do you think plant cells differ from animal cells

What is the unit for force we use when calculating F=ma?

A vector of magnitude 20 is added to a vector of magnitude 25. The magnitude of this sum. might be:. A. zero. B. 3. C. 12. D. 47. E. 50

Calculate the gravitational potential energy of a 10kg box on the top shelf of a closet, 2m above the floor

In late adulthood, changes in memory may bot be inevitable however, any decline in memory tends to invite

On october 15, 2001, a planet was discovered orbiting around the star hd 68988. its orbital distance was measured to be 10.5 million kilometers from the center of the star, and its orbital period was estimated at 6.3 days.