Help on some problems:EMERGENCY!!!!!!!! Hi all, I only have 4 problems I'm stuck on. Maybe you can help me a little...please?! I know it seems like a lot of problems, but i've really tried to do these and I'm majorly stuck. If you guys'll help with these last 4, I won't ever have this many again, so just this time, you could possibly help me. Okay... 1) Four 5.0kg spheres are located at the corners of a square of side .60 meters. Calculate the magnitude and direction of the gravitional force on one sphere due to the other three. 2) The Sun rotates about the center of the Milky Way Glaxay at a distance of about 30000 light years from the center (1 ly=9.5 x 10^15 m) if it takes about 200 million years to make one totation, estimate the mass of our Galaxy. Assume that the mass distribution of our galaxy is conventrated most in a central uniform sphere. If all the stars had about the mass of our Sun (2 x 10^30kg) how many stars would be in our galaxy? 3) The asteriod belt between Mars and Jupiter consists of many fragments. Which some scientists think came from a planet that once orbited the sun and then was distroyed. If the center of mass of the asteriod belt is about 3 time farther from the Sun that the Earth is , how long would it have taken this supposed planet to orbit the sun? 4) Two blocks are in contact on a frictionless table. A horizontal force is applied to one block. If m1=2.3kg, m2=1.2kg and F=3.2 N, find the force of contact between the 2 blocks, then show that if the smae force F is applied to m2 rather than m1 the force of contact between the blocks is 2.1 N. Again, if you guys will help me, I will be ETERNALLY grateful! Please help!!