Superman slams head-on into a locomotive speeding along at 16.67 m/s, bringing it to rest in an amazing 0.001 s, and saving Lois Lane, who was tied to the tracks. Calculate the average acceleration of the train.

the working equation for the angular size is the product of the physical size and 360 degrees divided by the product of two pi and distance from earth. the minimum size would be 0.559 degrees while the maximum size would be 0.49 degrees. 

the only real purpose of sputnik 1 was to beat the us into space. we were getting close to launching a useful satellite, explorer 1 - which launched on january 31, 1958. the ussr had to beat that, so they launched sputnik 1 on october 4, 19