Look at the graph below. Number of Half-lives
20 3.0 4.0
10
5.0
100
75
60
Со
27
Grams of Coromaining
25
00
00
5.27
10.54
15 81
21.08
26.35
Time in years
How many grams of cobalt-60 will remain after three half-lives?
O A. 1.25 g
O
B. 2.5 g
O C. 180 g
O D. 39

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?