Q1. A fellow student expresses an opinion that since the Suns spectrum has only weak absorption lines of hydrogen, this element cannot be a major constituent of the Sun. How would you enlighten this person? If a red star and a blue star both have the same radius and both are the same distance from the Earth, which one looks brighter in the night sky?

Q2. Object 1 has a mass m1 and a velocity 1 = (2.87 m/s). Object 2 has a mass m2 and a velocity 2 = (3.01 m/s). The total momentum of these two objects has a magnitude of 18.0 kg • m/s and points in a direction 66.5° above the positive x-axis. Find out m1 and m2.