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 do astronomers mean by the big bang?

At higher speeds, a vehicle rate of acceleration will be what?

Trace the path of energy from the sun to mechanical energy in an organism

The magnitudes of the charge densities on the inner and outer shells are now changed (keeping λinner = - λouter) so that the resulting potential difference doubles (Vca, new = 2Vca, initial).

A batter swings at a baseball. The action force is the bat hitting the ball with a force of 5N. The reaction force, however, cannot be determined.

An object has a kinetic energy of 233 J and a momentum of magnitude 20.4 kg·m/s. Find the speed and the mass of the object.

What is the average velocity of atoms in 1.00 mol of neon (a monatomic gas) at 465 K? For m, use 0.0202 kg.

What type of visible light spectrum does the sun produce?

In order for a current to be maintained through a conductor a difference in must be maintained from one end of the conductor to the other end. potential power resistance conductivity

A rocket initially at rest acceleration at a rate of 99.0meter/second^2. Calculate the distance covered by the rocket if it attains a final velocity of 445 meters/seconds after 4.50 seconds.