The ratio of the number of protons to neutrons in the nucleus of naturally occurring isotopes tends to vary with atomic number in what manner?
a. decreases with greater atomic number
b. increases with greater atomic number
c. remains constant for entire range of atomic numbers
d. is maximum for atomic number = 60
A
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A stepped steel shaft (G 5 75 GPa) with diameters d1 5 36 mm and d2 5 32 mm is twisted by torques T at each end. Segment lengths are L1 5 0.9 m and L2 5 0.75 m. If the allowable shear stress is 28 MPa and maximum allowable twist is 1.8°, the maximum permissible torque is approximately:
(A) 142 N?m
(B) 180 N?m
(C) 185 N?m
(D) 257 N?m
Light of wavelength 575 nm passes through a double-slit and the third order bright fringe is seen at an angle of 6.5° away from the central fringe. What is the separation between the double slits?
A) 5.0 µm B) 10 µm C) 15 µm D) 20 µm E) 25 µm
Which of these is the dominant mechanism for the removal of carbon dioxide from the atmosphere?
A) subduction B) photosynthesis in plants C) dissolving carbon dioxide in seawater D) formation of carbonate-rich rocks at the seafloor
What is the equivalent capacitance of the combination shown?
a.
29 µF
b.
10 µF
c.
40 µF
d.
25 µF