Answer Happy

All the problems please. Could you please show your work? Thatwill help a lot. Thank you very much.
1) A submarine's crush depth, the depth at which the submarine will implode due to the weight of the water on top of it exceeding the hull's capacity to resist deformation, is highly classified. However, analysis of some early submarine accidents, as well as good old-fashioned espionage, have put forth estimates of around 700-900 m for most submarines in service. Assuming a crush depth of 800 m, what is the pressure on a submarine as it reaches its crush depth? (2 point) 2) Sputnik 1, the first satellite to be put into earth orbit, weighed about 83.46 kg. Its orbital height was 577.75 km. Calculate the orbital speed of Sputnik and its period. (3 points) Note: This information is easily obtainable from the internet. No credit will be given unless the calculation is shown, including the formula used and each individual value used in the calculation.