When a parcel of air expands against the environment and no heat enters or leaves, its temperature
A) increases.
B) decreases.
C) remains unchanged.
Answer: B
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Several resistors are connected in series. Which of the following statements is correct? Choose all that are correct
1.The equivalent resistance is greater than any of the resistances in the group. 2.The equivalent resistance is less than any of the resistances in the group. 3.The equivalent resistance depends on the voltage applied across the group. 4.The equivalent resistance is equal to the sum of the resistances in the group. 5.None of those statements is correct.
The circuit below contains three 100-W light bulbs. The emf ? = 110 V. Which light bulb(s) is(are) brightest?
A. A B. B C. C D. B and C E. All three are equally bright.
Which of the following statements does not use the term angular size or angular distance correctly?
A) The angular distance between those two houses in the distance is 30 degrees. B) The angular distance between those two bright stars in the sky is about 2 meters. C) The angular size of the Sun is about the same as that of the Moon. D) You can use your outstretched hand against the sky to estimate angular sizes and angular distances.
The value of the dot product of two vectors depends on the particular coordinate system being used
A) True B) False