a) Determine the gravitational force between the earth and James Webb telescope when it is on station 1.5 million km (1.5 x 10^9 m) from earth. b). Determine the gravitational force between the earth and the Hubble telescope when it is on station 540 km (5.4 x 10^5 m) from earth. Use the mass of the earth m(earth) = 6 x 10^24 kg.

1. Please help me answer A and B. Well explained please. (Not written on a paper please) A. Sets out the two postulates of Albert Einstein's theory of special relativity. B. What is simultaneity? Use a concrete example in your explanation.

Use the Law of Gravitation with Kepler's third Law to determine the mass of the Earth Show the equation used for your calculation You can write Greek letters in the western alphabet (e.g. pi). Separate variables on the same line using * (e.g. x*y). Don't forget to include units!

Use the diagram and the fact that Planet A has a nearly circular orbit while Planet B has a highly elliptical orbit to answer the following questions. Use examples of Newton’s and Kepler’s laws in your answers. a. Does Planet B travel faster or slower when it is closest to the Sun than at other times? Explain your answer. b. Which planet takes longer to orbit the Sun? Explain your answer. c. Does the gravitational attraction between these planets increase or decrease as their orbits move them closer together? Explain your answer.  d. Which planet has the highest average orbital speed? Explain your answer. e. Which planet travels at about the same speed throughout its orbit? Explain your answer.