A thin uncharged conducting spherical shell has a charge q carefully placed at its center through a small hole in the shell. The charge q does not touch the shell. What is the charge on the outer surface of the shell?
a. q
b. ?q
c. 2q
d. 0
d
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A steel pipe (E 5 190 GPa, ? 5 14 3 1026/°C, d2 5 82 mm, and d1 5 70 mm) of length L 5 4.25 m hangs from a rigid surface and is subjected to a temperature increase ¢T 5 50 °C. The column is fixed at the top and has a small gap at the bottom. To avoid buckling, the mini-mum clearance at the bottom should be approximately:
(A) 2.55 mm
(B) 3.24 mm
(C) 4.17 mm
(D) 5.23 mm
Ocean tides are waves that have a period of 12 hours, an amplitude (in some places) of 1.50 m, and a speed of 750 km/hr. What is the distance between adjacent crests of these waves?
A) 9000 m B) 32,400 m C) 2500 m D) 32,400 km E) 9000 km
What resolving power is needed to resolve spectral lines at 651.22 nm and 651.81 nm?
A) 1100 B) 1000 C) 1200 D) 1400 E) 1300
Vegetable oil is boiled by passing steam at 215ºF through a 1-inch ID by 1.25-inch OD steel tube. Predict the overall heat transfer coefficient based on the outside area of the tube if the convective heat transfer coefficients are 25 Btu/hr?ft^2?ºF for steam and 15 Btu/hr?ft^2 ?ºF for the vegetable oil. Neglect fouling factors.
What will be an ideal response?