The spiral galaxy in the Andromeda constellation is about 2 * 1019 km away from us. How many light-years is this?

1. 3.48837 * 106 c.

2. 1.62791 * 106 c.

3. 7.39958 * 105 c.

4. 1.08668 * 107 c.

5. 2.11416 * 106 c.

6. 5.09514 * 106 c.

The index of refraction of a type of glass is 1.50, and the index of refraction of water is 1.33. If light enters water from this glass, the angle of refraction will be

How are wind and ocean currents formed?

Which of the following would be considered a pull factor? A. the lack of financial opportunities in one's home country B. political oppression in one's home country C. overpopulation in another country D. religious freedom in another country

A loop of wire is placed in a uniform magnetic field. For what orientation of the loop is the magnetic flux a maximum? For what orientation is the flux zero? Draw diagrams of these two situations. (Do this on paper.

If the coefficient of static friction between a table and a uniform massive rope is μs, what fraction of the rope can hang over the edge of the table without the rope sliding?

As a fire truck approached Mary, the pitch of the siren got higher. once the fire truck passed and moved away, the sirens pitch got lower. this change in pitch is because in the sound waves

Find the magnitude of the sum of these two vectors

Light waves that cross from an air medium to a water medium will A. O be focused into a straight line. B. O lose energy and dissipate. C. O change length and direction. D. O reflect off the water's surface.

What is a possible cost of using nonrenewable energy resources? A. Costs more money B. Less water pollution C. Sustainable energy D. Greenhouse gases

Kara is writing a science-fiction story. In the story, Earth no longer experiences day and night. To return Earth to normal, which action should the heroine of the story take? A. She should get the Sun to travel around Earth again. B.