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 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
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?
A) 42.5 cm B) 126 cm C) 88.8 cm D) 44.4 cm E) 222 cm
A long solenoid (n = 80 turns/cm) carries a current of 70 mA. Determine the magnitude of the magnetic field inside the solenoid
What fraction of the visible matter in the Milky Way Galaxy disk is in the form of gas and dust (and not stars)?
A. 0.1 percent B. 10 percent C. 75 percent D. 90 percent E. 50 percent