A simply supported wood beam (L 5 5 m) with rectangular cross section (b 5 200 mm, h 5 280 mm) carries uniform load q 5 6.5 kN/m includes the weight of the beam. The maximum flexural stress is approximately:
(A) 8.7 MPa
(B) 10.1 MPa
(C) 11.4 MPa
(D) 14.3 MPa
(C) 11.4 MPa
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Einstein earned the Nobel Prize for his
A) special theory of relativity. B) general theory of relativity. C) development of the equivalence of energy and matter, E = mc2. D) work on the particle nature of light. E) contributions to the development of the fission bomb.
A mass attached to the end of a spring is pulled out and released on a surface with friction. The work
? done on the mass by the force exerted by the spring
A. ?has the same sign as the change in energy owing to friction during one half of each cycle. B. ?never has the same sign as the change in energy owing to friction. C. ?always has the same sign as the change in energy owing to friction. D. ?never has the same sign as the change in energy owing to friction if the force of friction is greater than the spring force. E. ?always has the same sign as the change in energy owing to friction if the force of friction is greater than the spring force.
True or False: When a photon scatters off an electron, the photon loses energy
1.False 2.True