An astronomical unit is:
A. any planet's average distance from the Sun.
B. any large astronomical distance.
C. Earth's average distance from the Sun.
D. none of the above.
Ans: C. Earth's average distance from the Sun.
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A 100-W lamp glows brighter than a 25-W lamp. The electric resistance of the 100-W lamp is
A) less. B) greater. C) the same.
The atomic mass unit is defined as
A) the mass of a proton. B) the mass of a neutron. C) the mass of an electron. D) the mass of a hydrogen-1 atom. E) one twelfth the mass of a carbon-12 atom.
What is flow work?
What will be an ideal response?
One kilogram of chilled water (0°C) is placed in a freezer which is kept at 0°F (?18°C). Approximately how much electric energy (in kilocalories) is needed just to freeze the water if the room temperature is maintained at 75°F (24°C)? (Lice = 333 J/g; cice = 209 J/g/°C.)
a. 11 b. 15 c. 16 d. 13 e. 33