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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Charge of a uniform density (8.0 nC/m2) is distributed over the entire xy plane. A charge of uniform density (3.0 nC/m2) is distributed over the parallel plane defined by z = 2.0 m. Determine the magnitude of the electric field for any point with z = 3.0 m.
A. 0.79 kN/C B. 0.17 kN/C C. 0.62 kN/C D. 0.34 kN/C E. 0.28 kN/C
If the diameter of a radar dish is doubled, what happens to its resolving power assuming that all other factors remain unchanged? Its resolving power
A) quadruples. B) doubles. C) halves. D) is reduced to one-quarter its original value. E) is reduced to one-half its original value.
The Viking spacecraft searched for life on Mars by looking for the effects of life on the upper atmosphere
Indicate whether the statement is true or false
A Hooke's law spring is compressed a distance d and is used to launch a mass m vertically to a height h above its starting position. Under the same compression d, the spring is now used to launch a mass of 2m. How high does this second mass rise?
a. h c. h/1.41 b. h/2 d. h/4