Q1: It is believed that much of the mass of the universe is carried by what is called dark matter, matter that does not emit enough visible light or other radiation to be detected by conventional telescopes. However, dark matter does exert a gravitational force on other objects in the universe. Explain how dark matter might be detected and studied through the observation of "normal" matter (such as conventional stars). Q2: Give an example of motion in which (a) the magnitude of the instantaneous velocity is always larger than the average velocity and (b) the instantaneous velocity is never parallel to the instantaneous acceleration. Describe your example detailing how these conditions are being met.

Q1: It is believed that much of the mass of the universe is carried by what is called dark matter, matter that does not emit enough visible light or other radiation to be detected by conventional telescopes. However, dark matter does exert a gravitational force on other objects in the universe. Explain how dark matter might be detected and studied through the observation of "normal" matter (such as conventional stars). Q2: Give an example of motion in which (a) the magnitude of the instantaneous velocity is always larger than the average velocity and (b) the instantaneous velocity is never parallel to the instantaneous acceleration. Describe your example detailing how these conditions are being met.