Bottles of perfume sometimes have thick glass (n = 1.5) walls which give the impression the volume is larger than it is. Assume a cylindrical bottle has an inner radius of 1.0 cm and an outer radius of 2.0 cm. How thick (in cm) would the wall appear if you could see a mark on the inside surface?
a. 0.80
b. 0.51
c. 0.72
d. 80
e. 12
a
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A. 0.1 percent B. 10 percent C. 75 percent D. 90 percent E. 50 percent
A drive shaft resists torsional shear stress of ?xy 5 40 MPa and axial compressive stress ?x 5 270 MPa. One principal normal stress is known to be 38 MPa (tensile). The stress ?y is approximately:
(A) 23 MPa
(B) 35 MPa
(C) 62 MPa
(D) 75 MPa
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An amateur astronomer grinds a double convex lens whose surfaces have radii of curvature of 40 cm and 60 cm. The glass has an index of refraction of 1.54. What is the focal length of this lens in air?
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