How many moles are there in 2.00 kg of copper? The atomic mass of copper is 63.5 g/mol and its density is 8.90 g/cm3
A) 15.3
B) 31.5
C) 51.3
D) 53.1
B
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A composite beam is made up of a 200 mm 3 300 mm core (Ec 5 14 GPa) and an exterior cover sheet (300 mm 3 12 mm, Ee 5 100 GPa) on each side. Allowable stresses in core and exterior sheets are 9.5 MPa and 140 MPa, respectively. The ratio of the maximum permissible bending moment about the z axis to that about the y axis is most nearly:
(A) 0.5
(B) 0.7
(C) 1.2
(D) 1.5
Saturn’s many moons affect its rings through
A. tidal forces. B. orbital resonances. C. magnetic field interactions.
Interstellar dust clouds are best observed at what wavelength?
A) visible only B) radio and infrared C) UV and infrared D) radio and X-ray E) visible and UV
During the period of one day, the number of high tides at a given location is about __________
Fill in the blank(s) with correct word