A prismatic bar (diameter d0 5 18 mm) is loaded by force P1. A stepped bar (diameters d1 5 20 mm and d2 5 25 mm with radius of fillets R 5 2 mm) is loaded by force P2. The allowable axial stress in the material is 75 MPa. The ratio P1/P2 of the maximum permissible loads that can be applied to the bars, considering stress concentration effects in the stepped bar, is:
(A) 0.9
(B) 1.2
(C) 1.4
(D) 2.1
(C) 1.4
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Which of the following is evidence that convection occurs in the layers just below the Sun's photosphere?
a. Sunspots appear to be cooler than their surroundings. b. Solar prominences lift large loops of gas into the chromosphere and corona. c. The solar wind emits large numbers of charged particles. d. The Sun rotates differentially. e. The centers of granules are hot and moving upward away from the center of the Sun.
From what height above the surface of the earth should an object be dropped to initially have an acceleration of 0.54g? (G = 6.67 × 10-11 N ? m2/kg2, Mearth = 5.97 × 1024 kg, Rearth = 6.38 × 106 m)
A) 2300 km B) 1700 km C) 5400 km D) 2900 km
Energy Levels: An ionized atom having Z protons has had all but one of its electrons removed. If E is the total energy of the ground state electron in atomic hydrogen, then what is the total energy of the remaining electron in the ionized atom?
A. Z2E B. ZE C. E D. E/Z E. E/Z2
When at home during a tornado warning, you should seek shelter in the ______________ of the building
Fill in the blank(s) with correct word