The number of stars in the Milky Way Galaxy is approximately
A) a few hundred.
B) a few hundred thousand.
C) a few hundred billion.
D) a few hundred million.
C
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The iron in our solar system was created from smaller-mass atomic nuclei in
a. the Earth. b. our Sun. c. Jupiter. d. the big bang. e. supernovae.
All four jovian planets are oblate, with larger polar than equatorial diameters
Indicate whether the statement is true or false
A piece of iron of mass 0.12 kg is taken from an oven where its temperature is 336°C and quickly placed in an insulated copper can that contains 0.20 kg of water
The copper can has mass 0.50 kg, and it and the water in it are originally at a temperature of 20°C. Calculate the final temperature of the system, assuming no thermal energy is transferred to the surroundings. Use the following specific heats: 4190J/kg ? C° (water), 470 J/kg ? C° (iron), and 390 J/kg ? C° (copper).
If a light bulb has half the resistance of a 110-W light bulb, what would be its wattage? Assume both bulbs are attached to the same 160-V circuit
a. 220 W b. 55 W c. 1.5 W d. 330 W e. More information is needed.