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.

What is the best way to avoid being run over by your own pwc or motorboat?

What do radio waves and microwaves have in common? A) Both are at the side of the spectrum that has the highest radiant energy B) Both are found next to visible light on the electromagnetic spectrum C) Both are at the side of the spectrum that has

The blank is controlled by the expiramenter

Is Vaseline flammable?

Suppose that an object is moving with constant nonzero acceleration. Which of the following is an accurate statement concerning its motion? (a) - In equal times its speed changes by equal amounts.

What are the steps that are important to take for your safety during an earthquake? a. stay away from walls and windows c. stay away from electrical and gas lines b. get under a desk or table d. all of the above

You have an open air column of length 1.40 m in air at 24.2 °C. What is the frequency of the third harmonic?

Why do we use average force while solving momentum problems? How is net force related to the momentum of the object?

If you had a positive 8 score on the sit-an-reach test you

65 million years ago there was a mass extinction that is best known for killing the dinosaurs. There was also a large deposit of dust that contained substances only found in asteroids.