The gravitational force between two asteroids 1200 km apart is 8400 N. Find the following changes in gravity.
a. What is the force between them if the distance is 3600 km?
b. What is the force between them if the distance is 600 km?
USE FORMULA: Fg = GMm/r^2
Our Milky Way galaxy is very similar to our neighboring galaxy Andromeda. Consider that each galaxy contains approximately 4.0 x 10^11 stars, each star having an average mass of 2.0 x 10^30 kg.
a. If the gravitational pull of Andromeda is 2.4 x 10^30 N, how far away is Andromeda?
b. How many light years away is the Andromeda Galaxy? (Note: there are 365.25 days per year and light travels at 3.0 x 10^8 m/s).
c. The fastest space probe ever launched by humans is the New Horizons probe to Pluto. After swinging around Jupiter in February 2007, the probe has reached its maximum speed of 83,600 km/h. How long would it take the New Horizons probe to travel to the Andromeda galaxy in years?
Spaceman Spiff weighs 650 N on Earth. Spiff lands on Planet Z and measures his weight to be 1100 N. The radius of Planet Z is 4730 km. Complete the following questions.
a. What is the force between Spiff and Planet Z?
b. What is the acceleration of gravity on Planet Z?
c. What is the mass of Planet Z? Use scientific notation!
d. What would Spiff weigh on Planet W, which has twice the mass of Planet Z but three times the radius?