Until recent times, astronomers had to await a total solar eclipse to study the chromosphere. Why do suppose you cannot hold a coin in front of you to cover the solar disk and create an artificial eclipse that will permit you to study the chromosphere?

Answer: it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.explanation:   we have equation of motion ,where s is the displacement, a is the acceleration, u is the initial velocity and t is the time taken.average velocity = displacement/ time taken.average velocity = 10.69 miles/hr = 10.69*1.6*1000/(60*60) = 4.75 m/s4.75 = s/ts = 4. 1we also have acceleration = 2.18 m/s², initial velocity = 0 m/sso it will take   4.36 seconds to reach her average velocity 10.69 miles/hour.

An atom's smaller negative particles are at a distance from the central positive particles, so the negative particles are easier to move.