A cylindrical tank is assembled by welding steel sections circumferentially. Tank diameter is 1.5 m, thick- ness is 20 mm, and internal pressure is 2.0 MPa. The maximum shear stress in the heads is approximately:
(A) 19 MPa
(B) 23 MPa
(C) 33 MPa
(D) 35 MPa
(A) 19 MPa
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The isotope 238U, which starts one of the natural radioactive series, decays first by alpha decay followed by two negative beta decays. At this point, what is the resulting isotope?
a. 234Th (Z = 90 for Th.) b. 236U c. 238U d. Some other uranium isotope not given above.
Because more massive stars have more gravitational energy, they can fuse heavier nuclear fuels
Indicate whether the statement is true or false
The observed spectral lines of a star are all shifted towards the red end of the spectrum. Which statement is true?
A) The star is not rotating. B) This is an example of the photoelectric effect. C) This is an example of the Doppler effect. D) The star has a radial velocity towards us. E) The second law of Kirchhoff explains this.
A(n) _________ source produces new dislocations when a segment of a dislocation is pinned at two ends on a slip plane and the resolved shear stress reaches a critical value.
Fill in the blank(s) with the appropriate word(s).