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

Physics & Space Science

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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.

Physics & Space Science

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

Physics & Space Science

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

Physics & Space Science

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.

Physics & Space Science