Aman carries a 12-kg chair up one flight of stairs to the second floor of his house. if the second floor is 3.3 m above the first floor, what is the change in the gravitational potential energy of the chair? a - 180 j b + 390 j c + 180 j d - 390 j e zero

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?