Which of the following statements is correct?
a. You only need to know the amount of thermal energy a body contains to calculate its temperature. b. The temperature of a body is directly proportional to the amount of work the body has performed. c. The quantity of thermal energy exchanged by two bodies in contact is inversely proportional to the difference in their temperatures.
d. The quantity of thermal energy exchanged by two bodies in contact is directly proportional to the difference in their temperatures.
e. Different amounts of thermal energy are transferred between two bodies in contact if different temperature scales are used to measure the temperature difference between the bodies.
D
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In selecting a unalloyed alumina material for a design, it would be expected that the one with the _________density would have the highest tensile strength.
Fill in the blank(s) with the appropriate word(s).
If the orbital velocity of an eclipsing binary is 97 km/s and the smaller star is completely eclipsed in 2 hours, what is the diameter of the smaller star?
a. 175,000 km b. 350,000 km c. 194 km d. 700,000 km e. 4656 km
The most important factor contributing to the differences in the internal structure of the Moon and Earth is size
Indicate whether the statement is true or false
A 0.20-km wide river has a uniform flow speed of 4.0 m/s toward the east. It takes 20 s for a boat to cross the river to a point directly north of its departure point on the south bank. In what direction must the boat be pointed in order to accomplish this?
a. 23° west of north b. 20° west of north c. 24° west of north d. 22° west of north e. 17° west of north