Which of the following statements about features on the sun is true
a. prominence's look dark in regular photographs.
b. solar flares form when prominence's connect.
c. the number of sunspots on the suns surface is always the same.
d. sunspots can greatly increase the solar wind.

Aboy with a mass 25 kg climbs into a small tree. he sits on a branch that is 2.o m above to the ground. what is his gravitational potential energy above the ground?

Rank the six combinations of electric charges on the basis of the electric force acting on q1. define forces pointing to the right as positive and forces pointing to the left as negative. rank positive forces as larger than negative forces. q1,q2,q3 = positive(+) q1 = + q2 = + q3 = - q1 = + q2= - q3= + q1= - q2= + q3= + q1= + q2= - q3= - q1,q2,q3 = negative

How do you know how many valence electrons an atom has?