A cast iron is used to support a compressive load. Knowing that e=70 gpa and that the maximum allowable change in length is 0. 25%. Compute for the minimum wall thickness for a load of 7. 3 kn if the outside diameter tube is 50 mm.

How do refracting telescopes magnify a far away image? a. by directing light beams to meet at a focal point b. by absorbing light beams’ wavelengths c. by forcing light beams to change direction d. by measuring light beams’ velocity