Assume a stellar atmosphere of pure helium. (a) find i at t=15,000k. assume ni the electron pressure in the atmosphere is pe 20 n /m2. calculate how this would change for t 5,000k and t 25,000 k. helium has two electrons and so can be doubly ionized, he iii. (b) what is nat t-15,00ok. calculate how this would change for t = 5,000k and t 25,000 k. (c) how does l compare to as the temperature changes? describe why this occurs ni

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.