An astronomical telescope has an objective of diameter 20 cm with a focal length of 180 cm. the telescope is used with an eyepiece of focal length 30 mm. what is the angular magnification of this telescope?

In addition to possibly releasing harmful chemicals in the environment, mining is considered A. the least dangerous job in the United States. B. the most dangerous job in the United States. C. the least lucrative job in the United States. D.

The pioneer in the technique of photographic collage was:

The amplitude of a mechanical wave shows What?

Describe how a volcano is formed at a Continental Rift. Be sure to include, in your description, what is occurring at the plate boundary.

What is the magnitude of a the vertical electric field that will balance the weight of a plastic sphere of mass that has been charged to - 3.0 nC? g

Explain the relationship between motion and frame of reference.

Two students are looking at a brightly lit full Moon, illuminated by the reflected light from the Sun. Consider thefollowing discussion between the two students about what the spectrum of moonlight would look like.

When performing a battery load test, what should the load be set to?

If you push on a wall of a building what will happen

A conductor, with outer surface labelled a, contains a cavity, inner surface b. In this cavity there is a conducting sphere of radius r, and surface c. The sphere carries a charge of 1 C, while the conductor a charge of 2 C.