A composite beam of aluminum (Ea 5 72 GPa) and steel (Es 5 190 GPa) has a width b 5 25 mm and heights ha 5 42 mm and hs 5 68 mm, respectively. A bending moment is applied about the z axis resulting in a maximum stress in the aluminum of 55 MPa. The maximum stress in the steel is approximately:
(A) 86 MPa
(B) 90 MPa
(C) 94 MPa
(D) 98 MPa
(D) 98 MPa
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Metric System: An area of 1.00 × 102 cm2 is how many square meters?
A. 1.00 m2 B. 1.00 × 102 m2 C. 1.00 × 10-2 m2 D. 1.00 × 104 m2 E. 1.00 × 10-3 m2
A battery charges a parallel-plate capacitor fully and then is removed. The plates are then slowly pulled apart. What happens to the potential difference between the plates as they are being separated?
A) It increases. B) It decreases. C) It remains constant. D) It cannot be determined from the information given.
When an electron changes from n = 3 to n = 2, a(n) ______________ is given off
Fill in the blank(s) with correct word
What causes the outward gas pressure that balances the inward pull of gravity in a main-sequence star?
a. the rapid outward flow of gas b. the rapid inward flow of the gas c. the high temperature of the gas d. the high density of the gas e. the high temperature and the high density of the gas