Which of the following statements about stellar parallax is true?
- the amount of parallax we see depends on how fast a star is moving relative to us.
- the closer a star is to us, the more parallax it exhibits.
- it takes at least 10 years of observation to measure a star's parallax.
- we observe all stars to exhibit at least a slight amount of parallax.
- stellar parallax was first observed by ancient greek astronomers.

How does the image distance (di) of a convex lens compare with the image distance of a concave lens? a. the image distance of the convex lens is positive, and that of the concave lens is negative. b. both are negative for a virtual image. c. both are positive for a virtual image d. the image distance of the convex lens is negative, and that of the concave lens is positive.

High schoolphysics 5+3 pts a neon light consists of a glass tube with metal wires at each end. when connected to a high-voltage source, the gas glows. if a fly lands on the glass tube, what will most likely happen? a) the fly will not feel a shock because the glass conducts any free electrons back into the gas. b) electrons will flow directly from the metal wires along the glass and shock the fly. c) the fly will not feel a shock because the glass insulates it from the electrons in the gas and the metal. d) electrons that are moving through the gas will be conducted through the glass and shock the fly.

How is zig zagging a form of acceleration?