The gas used to fill party ballons contain only helium atoms. This make helium a (n).

The tropical year, the time from vernal equinox to the next vernal equinox, is the basis for our calendar. it contains 365.242199 days. find the number of seconds in two and a half tropical years.

What is the sum of the kinetic energies of the alpha particle and the new nucleus?

a car with an initial velocity of 10ms north was accelerated for 6 second until it ha a final velocity of 25ms north, what is the cars acceleration?

Describe a situation in which an object is not in equilibrium, even though the net force on it is zero.

If the moon phase is seen as a waxing crescent moon in london, what phase of the moon would be seen in new york if it's viewed at the same time?

Give the definition for diffusion. (A) gas molecules mix unequally average distance between collisions (B) gas molecules escape from a container into a vacuum through a small hole (C) gas molecules mix equally (D) gas molecules spread out in a

As resistance goes up, what happens to the current?

1. A 0.828-nm photon collides with a stationary electron. After the collision, the electron moves forward and the photon recoils backwards. a) Find the momentum of the electron. b) Find the kinetic energy of the electron.

When are you most aware of your motion in a moving vehicle: when it is moving steadily in a straight line or when it is accelerating?

The force of gravity on a person or object on the surface of a planet is called?