What is the main optical element of a refracting telescope?

If an electron is moved a certain distance directly opposite an external electric field, what can we say about the change in the electric potential energy of the system?

What is the weight of a 40kg object on the moon? (in Newtons)

What type of factrors affect weather the rock is a fold or fault

Jessica's weight is 540 newtons. According to the Third Law, if the Earth pulls on Jessica with a force of 540 N, then Jessica pulls on the Earth with a force of 540 newtons that acts in the opposite direction.

Portland, Oregon, has an average of 240 cloudy days per year. Which heating system would be the least likely choice for this environment?

A wave has a speed of 50 m/s and a frequency of 10 Hz. Calculate its wavelength.

A conservative force acts on a particle. We can conclude: A. The work done by the force on the particle depends only on initial and final position. B. The force must be constant. C. The particle cannot change direction. D.

Which action is caused by gravity? a frost wedging b aeolian bands c mass wasting d glaciation

A light beam is directed parallel to the axis of a hollow cylindrical tube. When the tube contains only air, the light takes 8.72 ns to travel the length of the tube, but when the tube is filled with a transparent jelly, the light takes 1.

Neon, helium, methane, krypton, xenon, hydrogen, and ozone make up & what of the atmosphere