At very low temperatures the resistivity of some materials becomes zero as indicated by high precision measurements. This phenomenon is known as
A)
supercapacitance.
B)
superconductivity.
C)
BSCCO.
D)
superresistivity.
E)
supraresistivity.
B
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Pascal's Principle: A 12,000-N car is raised using a hydraulic lift, which consists of a U-tube with arms of unequal areas, filled with oil with a density of 800 kg/m3 and capped at both ends with tight-fitting pistons. The wider arm of the U-tube has a radius of 18.0 cm and the narrower arm has a radius of 5.00 cm. The car rests on the piston on the wider arm of the U-tube. The pistons are initially at the same level. What is the force that must be applied to the smaller piston in order to lift the car after it has been raised 1.20 m? For purposes of this problem, neglect the weight of the pistons.
A. 0.954 kN B. 1.88 kN C. 1.96 kN D. 3.67 kN E. 1.20 kN
To increase the temperature of 50 grams of water by 2 Celsius degrees requires
A) 0.04 calorie. B) 2 calories. C) 4.19 calories. D) 25 calories. E) 100 calories.
The overall result of the proton-proton chain is
A) 6 H becomes 1 He + energy. B) p + p becomes 2H + energy. C) 4 H becomes 1 He + energy. D) Individual protons are joined into long chains of protons.
What does the phenomenon of interference demonstrate?
A) the wave nature of light B) the polarization of light waves C) the quantization of the atomic orbitals D) the particle nature of the photon E) the process of ionization