An aluminum beam (E 5 72 GPa) with a square cross section and span length L 5 2.5 m is subjected to uniform load q 5 1.5 kN/m. The allowable bending stress is 60 MPa. The maximum deflection of the beam is approximately:
(A) 10 mm
(B) 16 mm
(C) 22 mm
(D) 26 mm
(C) 22 mm
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In latitudes where the subsurface layer of soil always remains frozen, the frozen layer is called
a. an aquifer. b. the frost table. c. a glacier. d. permafrost.
Charge of uniform density (80 nC/m3) is distributed throughout a hollow cylindrical region formed by two coaxial cylindrical surfaces of radii 1.0 mm and 3.0 mm. Determine the magnitude of the electric field at a point which is 4.0 mm from the symmetry axis
a. 7.9 N/C b. 10 N/C c. 9.0 N/C d. 8.9 N/C e. 17 N/C
Pressure: A person weighing 900 N is standing on snowshoes. Each snowshoe has area 2500 cm2 and has negligible weight. What pressure does this person's weight exert on the snow?
A. 0.18 N/m2 B. 0.36 N/m2 C. 1800 N/m2 D. 3600 N/m2
Who was the first to successfully explain the photoelectric effect?
a. Planck b. Young c. Bohr d. Einstein