Venice italy provides a dramatic example of ____ because of heavy ground water withdrawals
A) water table depletion
B) building damage
C) ground subsidence
D) ground water contamination
E) transportation
Ans: C) ground subsidence
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You are asked to select a polymer for a design where the temperature could vary between 0°C and 100°C, and it is desired that the polymer’s mechanical properties should not significantly change over this temperature range. What type of polymers would you initially investigate for this design, and why would you make this selection?
What will be an ideal response?
Resistance and Resistivity: A wire of resistivity ? must be replaced in a circuit by a wire of the same material but four times as long. If, however, the total resistance is to remain as before, the diameter of the new wire must
A. be the same as the original diameter. B. be one-half the original diameter. C. be one-fourth the original diameter. D. be two times the original diameter. E. be four times the original diameter.
What is the minimum speed needed by a ground-state hydrogen atom for its kinetic energy to be enough to ionize the atom in a collision? (1 eV = 1.60 × 10-19 J, mH ? mproton = 1.67 × 10-27 kg)
A) 44.2 km/s B) 21.7 km/s C) 66.5 km/s D) 113 km/s E) 51.0 km/s
An experiment determines that there are 49 allowed rotational energies for a diatomic molecule whose moment of inertia is 2 × 10^?46 kg ? m2 . The maximum rotational kinetic energy (in eV) is
a. 0.6 b. 0.2 c. 0.4 d. 0.8 e. 1.0