PLEASE HELP ME WITH THIS PHYSICS ASSIGNMENT THERES A TIME LIMIT

Question 6 In order to compare the orbital radii of two planets, which of the following must be known? Not yet I. the periods of the planets' orbits answered Marked out of Il. that the planets are in orbit about the same sun 1.00 Ill. the masses of the planets Flag question Select one: O a. Il only O b. I only O c. l and Ill O d. l and llQuestion 7 The moon Ariel orbits Uranus with an average radius of 1.91 x 108 m once every 2.18 x 105 Not yet s. If Uranus's moon Titania orbits with a radius of 4.36 x 108 m, what would you expect its answered period to be? Marked out of 1.00 Select one: Flag O a. 3.92 x 105 s question O b. 4.98 x 105 s O c. 3.78 x 105 s O d. 7.52 x 105 sQuestion 8 The mass of Mars is 6.40 x 1023 kg. NASA wants to put a satellite into orbit about Mars. The Not yet satellite is to orbit Mars with an orbital radius of 4.80 x 10 m (measured from the center of answered Mars) Marked out of 1.00 What orbital period will the satellite have? Flag Select one: question O a. 4.72 x 104 s O b. 6.87 x 105 s O c. 1.01 x 104 s O d. 1.76 x 104 sQuestion 9 A stunt-rider on a motorcycle rides down a ramp and into a vertical loop-the-loop. If the Not yet diameter of the loop is 9.38 m, then the slowest speed the motorcycle can have at the top of answered the loop if it is to remain in contact with the loop is m/s. (Record your Marked out of 1.00 answer to the nearest hundredth in the box provided.) Flag questionTime Tent z O. TO Question 10 If Kepler's constant for a planet is 6.56 x 10-15 s2/m3, then the speed of a satellite which has Not yet a radius of orbit of 7.20 x 10 m is a.bc x 10 m/s. The values of a, b, c, and d, respectively, answered are Marked out of 1.00 (Record all four digits of your answer in order. For example, if you get 1.23 x 104 m/s as an Flag answer, you would record 1234 in the answer box.)