Which type of force would be the equal and opposite force to a gravitational force?
a. gravitational
b. electromagnetic
c. strong
d. weak
e. It could be any one of the above or some combination of them.
a
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The wavelength of an x-ray is between
(a) 10 and 100 nm (b) 1 and 10 nm (c) 0.1 to 1 nm (d) 0.01 and 0.1 nm
Conduction: Two metal rods, one silver and the other copper, are both immersed at one end in a steam chamber at a temperature of 100°C. The other end of each one is in an ice water bath at 0°C. The rods are 5.0 cm long and have a square cross-section that is 2.0 cm on a side. No heat is exchanged between the rods and the surroundings, except at the ends. How much total heat flows through the two rods each minute? The thermal conductivity of silver is 417 W/m ? K, and that of copper is 395 W/m ? K.
A. 20 kJ B. 39 kJ C. 47 kJ D. 49 kJ E. 11 kJ
It's the June solstice, the Sun is at your zenith, and you have a UT clock that tells you it is midnight in Greenwich, England. Where are you?
A) on the Tropic of Cancer near the International Date Line B) on the equator near the International Date Line C) on the Tropic of Cancer, due south of Greenwich, England D) at latitude 25°S and longitude 49°E
The orbits of most comets:
A) are like the planets, fairly circular and in the ecliptic plane. B) lie almost entirely beyond the orbit of Neptune. C) have perihelions within the orbits of Mercury. D) go no farther out than Pluto, then return to the Sun again. E) are shorter than the 76 year period for Comet Halley.