In designing buildings to be erected in an area prone to earthquakes, what relationship should the designer try to achieve between the natural frequencies of the building and the typical earthquake frequencies?
What will be an ideal response?
If possible, the natural frequencies of the building should be much smaller than the typical earthquake frequencies; this will minimize the amplitude of the oscillations of the building.
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A parallel plate capacitor has a paper dielectric having dielectric strength 8.0 kV/mm and dielectric constant 3.0. The plate area is 3000 cm2 and the plate separation is 0.50 mm. What is the highest voltage that can be applied to this capacitor?
A. 15 V
B. 
C. 
D. 
E. 
In Problem 2.7, the moment of force F and couple M about line AC is (in-lb):
(A) 14.4i – 19.2j 2 24k (B) 218.4i – 19.2j 1 28k (C) 214.4i – 29.2j 1 24k (D) 214.4i – 19.2j 1 24k
The ____ is the point on the celestial sphere directly above an observer who can be at any point on the Earth
a. north celestial pole b. south celestial pole c. zenith d. celestial equator e. nadir
A ray of light travels from a glass-to-liquid interface at an angle of 23°. Indices of refraction for the glass and liquid are, respectively, 1.58 and 1.80 . What is the angle of refraction for the ray moving through the liquid?
a. 26.4° b. 20.1° c. 17.5° d. 20.2° e. 26.2°