Under which condition would time periods of daylight and darkness be equal everywhere on earth all year? a. if earth revolved around the sun in a more circular orbit b. if earth rotated on an axis that was not tilted with respect to earth's orbit c. if earth had two moons d. if earth revolved in an orbit closer to the sun

Abeverage can is made of 3004-h19 aluminum alloy (elastic modulus 69 gpa, tensile yield strength 285 mpa, density 2.72 g/cm^3). the dimensions on the can are approximated as a thin-walled cylinder with a height of 4.83 inches, diameter of 2.60 inches. empty the can has a mass of 14.2 g. determine: a. the wall thickness of the cylinder b. assuming a pinned-pinned condition what is the critical load? c. assuming a fixed-fixed condition what is the critical load?