An alpha particle collides with an oxygen nucleus, initially at rest. the alpha particle is scattered at an angle of 42.0° above its initial direction of motion, and the oxygen nucleus recoils at an angle of 49.0° below this initial direction. the final speed of the oxygen nucleus is 1.60×10^5 m/s. (the mass of an alpha particle is 4.0 u, and the mass of an oxygen nucleus is 16 u.) what is the final speed of the alpha particle?

4. 50x10= 500m/s 5. 52m/s

The answer is water molecules are split.cellular respiration and photosynthesis are complement  reactions to each other. these are reverse reactions. in cellular respiration glucose and oxygen yield water and carbon dioxide. so, when respiration begins,  glucose molecules are split. in the opposite reaction - in photosynthesis, carbon dioxide and water yield glucose and oxygen. thus,  when respiration begins, water molecules are split.

We can infer that star y is closer but other factors must be considered include the heat of the star, the mass, and the brightness of the star. even though star x seems dimmer it may just be less bright or contains less heat.