In 1964, a scientist discovered that there was low-energy cosmic background radiation coming from all parts of space. This observation supported one of the theories explaining how the universe began. Which of the following statements does this evidence support about the origin of the universe?
A. The universe originated with a period of extreme and rapid contraction.
B. The universe expanded slowly for a short time and stopped.
C. The universe originated with a period of extreme and rapid expansion.
D. The universe originated and remains in the same steady-state.

Aparticle of mass m is projected with an initial velocity v0 in a direction making an angle α with the horizontal level ground as shown in the figure. the motion of the particle occurs under a uniform gravitational field g pointing downward. (a) write down the lagrangian of the system by using the cartesian coordinates (x, y). (b) is there any cyclic coordinate(s). if so, interpret it (them) physically. (c) find the euler-lagrange equations. find at least one constant of motion. (d) solve the differential equation in part (c) and obtain x and y coordinates of the projectile as a function of time. (e) construct the hamiltonian of the system, h, and write down the hamilton’s equations (canonical equations) of motion.

4. who was the first one to measure the speed of light and conclude that it is finite? 5. who was the first philosopher who thought the speed of light is finite? 13. what is the speed of light numerically? 14. give an example of something moving faster than light 15. give an example for some particles or waves that

Explain earth's motion, using the terms "precession" and "rotation" in your answer.