Which of the following materials has the highest dielectric constant?
a. air
b. Mylar
c. paper
d. Pyrex glass
e. water
e
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A certain thermodynamic engine extracts 1.30 kJ of thermal energy from a hot temperature reservoir and discharges 0.70 kJ of energy to a cold temperature reservoir. What is the efficiency of this engine?
A) 46% B) 54% C) 86% D) 27% E) 13%
Suppose we have a cube containing one mole of gold and another cube containing one mole of aluminum. (The gold cube has more than 7 times the mass of the aluminum cube.) Both are initially at room temperature. Suppose that we increase the temperature of each by 10 K. Which cube’s thermal energy likely has increased more?
A. The gold cube B. The aluminum cube C. Each cube’s internal energy increase is about the same. D. One cannot say without measuring.
How large a force is necessary to stretch a 2.0-mm diameter copper wire (Y = 11 × 1010 N/m2) by 1.0%?
A. 2.1 kN B. 3.5 kN C. 6.9 kN D. 11 kN E. 5.4 kN
How does the wavelength of visible light compare to the wavelengths of other forms of electromagnetic radiation?
A) longer than ultraviolet but shorter than X-ray B) longer than X-ray but shorter than gamma ray C) longer than infrared but shorter than radio wave D) longer than X-ray but shorter than radio wave