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.

If a spring has a k value of 100 newtons per meter and it is stretched 0.50 meters, what is the restoring force of the spring?

How to tell if a molecule is polar or nonpolar with electronegativity

1. a camcorder has a power rating of 19 watts. if the output voltage from its battery is 7 volts, what current does it use?answer units 2. a 1.5m wire carries a 6 a current when a potential difference of 57 v is applied. what is the resistance of the wire? your