Why does a helium balloon float in air?

A. Helium is denser than air.

B. Helium is less dense than air.

C. The helium is under pressure in the balloon.

When salt is dissolved in water, it actually breaks down into two different substances. is salt composed of atoms or molecules?

How long did Skylab orbit the earth?

When NaH combines with water, OH - ions are produced. This shows that NaH is an acid.

How do dominant alleles and recessive alleles differ?

Concurrent forces are two or more forces that act on the same? at the same?

To determine waves frequency you must know the what

What is the average speed in miles per hour of the car that traveled a total of 200 miles in 5.5 hours

A solid weighs 277.5 g in air and 212.5 g when totally immersed in the liquid of density 0.9 g / cc. Calculate the density of the solid.

Who first described the double-helix structure of DNA?

Suppose you are holding a basketball while standing still on a skateboard you are and the skateboard have a mass of 50 kg you throw the basketball with a force of 10 N what is your acceleration before and after you throw the ball