1.Three cylinders from the same mix were tested for strenght. Cylinders A and B were cast in 4x8 molds while cylinder C was cast in a 6x12 mold. The total loads were as follows; cylinder A= 65,200 lbs., cylinder B= 68,550 lbs., cylinder C= 151,190 lbs. Determine the average P.S.I for this mix?
2.A 6kg diskA has an initial velocity of 20m/s and strikes heaadon diskB that has a mass of 24kg and is originally at rest.
If the collision is perfectly elastic,
Determine the speed of each disk after the collision and the impulse which disk A imparts to disk B.