The constellations in which the Sun appears over the course of each year are called
a. circumpolar stars
b. circumsolar stars
c. the constellations of the zodiac
d. the tropical constellations
e. solstice stars
Ans: c. the constellations of the zodiac
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Energy in Capacitors: An air-filled capacitor has a potential difference between the plates of 80 V. If the charge on each of the plates of the capacitor has magnitude 8.0 ?C, what is the electrical energy stored by this capacitor?
A. 640 µJ B. 320 µJ C. 50 nJ D. 60 nJ E. 30 pJ
What do we mean by a mass extinction?
A) the extinction of large animals, such as dinosaurs B) the extinction of a large fraction of the world's plant and animal species in a relatively short period of time C) an extinction caused by the impact of an asteroid or comet D) the extinction of any species of plant or animal that has mass
In special relativity, we learned that people in different reference frames will measure time differently. According to general relativity, why does this happen?
A) People in different reference frames experience different realities. B) It is an illusion, and time really is the same for everyone. C) They have different worldlines. D) They are experiencing the same spacetime reality, but from different perspectives.
Use a flux plot to estimate the rate of heat flow through the object shown in the sketch. The thermal conductivity of the material is 15 W/(m K). Assume no heat is lost from the sides.
GIVEN
The shape of object shown in the sketch
The thermal conductivity of the material (k) = 15 W/(m K)
The temperatures at the upper and lower surfaces (30°C & 10°C)
FIND
The rate of heat flow through the object (By means of a flux plot)
ASSUMPTIONS
No heat is lost from the sides and ends
Uniform thermal conductivity
Two dimensional conduction
Steady state
SKETCH
