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
(B) 0.7
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How fast does a pulsar initially spin?
a. 10 times per second b. 1 time per second c. 100 times per second d. 1000 times per second
As the solar nebula contracts, it
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The Dirac theory predicted that a positron would be:
a. a particle with same mass as an electron but with opposite charge. b. a particle with negative mass. c. a negative electron in a negative energy state. d. All of the above.
At what speed would a proton need to circle the Earth at a height of 1000 km above the equator if the Earth's magnetic field is horizontal and directed north-south, with an intensity of 4.00 × 10?8 T? (The radius of the Earth is 6400 km and the charge and mass of the proton are q = 1.60 × 10?19 C and mp = 1.67 × 10?27 kg. Ignore relativistic corrections.)
What will be an ideal response?