Required information A star near the visible edge of a galaxy travels in a uniform circular orbit. It is 43,600 ly (light-years) from the galactic center and has a speed of 275 km/s. Estimate the total mass of the galaxy based on the motion of the star. Gravitational constant is 6.674-10-11 m3/kg-s2) and mass of the Sun M-1.99-1030 kg. billion solar mass

Question in images provided

Review Homework The assignment does not need to be submitted " you are encountering difficulties with this homework reach out to the instructor, the student instructor, or a tutor. The instructor's office hours are MWF 1:30-2:30 pm and M 7-8 pm, F 8-9pm. À Race Car A 1200kg race car is initially at rest. When the driver steps on the gas, the car's engine to pushes it forward with a constant force of 6200N. a 420ON 1. What is the acceleration of the car? 1200kg 2. How far will the car go in 3.0s? 2 Reading a ruler The picture below shows a tape measure measuring a board. How long is the board? Be sure to provide a ± accuracy with your number. 51 in 52 53 54 5! 53.25in=.01in 3 Water bottle full of sand Sand has a density of 1621 . 1. What is the mass of a one liter water bottle full of sand? 2. What is the weight of the water bottle? 1

Astronomy help please

22. Use the infographic below to determine the gravitational force of the earth and the following two space telescopes. 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.

The answer was 25 years. Can you explain how they got that?

please help me answer these questions