What do scientists study to figure out how long it takes the Sun to make one rotation on its axis?

A. flares

B. auroras

C. sunspots

D. prominences

What kind of diagram is used to show how many valence electrons an atom has

Which of the following are disadvantages of solar energy? Check all that apply. A. It contributes to global warming. B. It is expensive. C. It is not equally effective for all areas of the world. D. It is not effective at all times of day.

How does the electric force between two charged particles change if the distance between them is increased by a factor of 3? a. it is reduced by a factor of 3 b. it is increased by a factor of 3 c. it is increased by a factor of 9 d.

Which of these statements best supports the conclusion that a substance is in the plasma phase?

A car is moving at a constant speed along a straight line. Which statement is true about the forces acting on the car? A. The net force acting on the car from all directions is zero. B.

A 26-g steel-jacketed bullet is fired with a velocity of 630 m/s toward a steel plate and ricochets along path CD with a velocity 500 m/s.

A small boat is carrying four people across a river. Without any paddling, the boat moves downstream at a steady speed of 5 m/s. If the average weight of the four people is 60 kg, then what is the speed of the boat after one person gets?

Does temperature affect the dissolving phase?

In a clear, coherent, paragraph-length answer, explain why the speed of the apple half way between the release and the maximum height is not half the initial speed.

In pea plants Round (R) is a dominant trait and wrinkled nose (r) is a recessive trait. Which combination would result in wrinkled seeds? 1. RR 2. Rr 3. rr 4. ww