Which should have the higher thermal conductivity, a single-crystal gas-turbine blade or a polycrystal turbine blade? _____________
Fill in the blank(s) with the appropriate word(s).
single-crystal gas-turbine blade
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Spherical Mirrors: If a spherical concave mirror has a radius of curvature R, its focal length is
A. R/4. B. R/2. C. R. D. 2R. E. 4R.
The masses of the Moon and Earth are 7.4 ´ 1022 kg and 6 ´ 1024 kg, respectively. Earth-Moon distance is 3.8 ´ 108 m. What is the size of the gravitational force between Earth and the Moon? The gravitational constant is G = 6.67 ´ 10-11 N-m2/kg2.
A. 2.05 ´ 1020 N B. 7.79 ´ 1028 N C. 3.07 ´ 1030 N D. 1.17 ´ 1039 N
If a pencil's length and diameter are both multiplied by 10, then its volume is multiplied by
A) 10. B) 100. C) 1000. D) 10,000. E) none of the above
How is Einstein's famous equation, E= mc2, important in understanding the Sun?
A) It explains the fact that the Sun generates energy to shine by losing some 4 million tons of mass each day. B) It explains why the Sun's surface temperature is about 6,000°C. C) It explains why the Sun is so massive. D) It explains why the Sun has a magnetic field strong enough influence the atmospheres of the planets.