A simply supported wood beam (L 5 5 m) with rectangular cross section (b 5 200 mm, h 5 280 mm) car- ries 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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A 90-m-long high-voltage cable is suspended between two towers. The mass of the 90-m cable is 100 kg. If the tension in the cable is 25 000 N, what is the lowest frequency at which this cable can oscillate?
a. 0.83 Hz b. 1.00 Hz c. 1.7 Hz d. 2.00 Hz e. 3.3 Hz
In the context of astronomy, a habitable zone is:
A) a region on a planet where conditions are acceptable for life to exist. B) a region around a star where a planet's temperature would permit the existence of liquid water. C) a region on a young planet where amino acids can begin to form deoxyribonucleic acid (DNA) molecules. D) a region around a star where different types of planets can form.
Kinetic Energy: Calculate the amount of energy needed to accelerate an electron from 0.888 c to 0.991 c. Express your answer in MeV. The mass energy of an electron is 0.511 MeV.
A. 2.71 MeV B. 1.89 MeV C. 4.60 MeV D. 5.68 MeV
The quantum mechanical model of the hydrogen atom requires that if the orbital quantum number of the hydrogen atom is 3, there will be how many permitted orbital magnetic quantum numbers?
a. three c. four b. nine d. seven