How long does it take for Earth to revolve around the Sun?
A) one day
B) one week
C) one month
D) one year
Answer: D
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Answer the following statement(s) true (T) or false (F)
1. There is an electric field in the bar’s rest frame.
2. There is a magnetic field in the bar’s rest frame.
We find from igneous rock dating that the polarity of the Earth's magnetic field has undergone many unexplained changes in periods of thousands of years
Indicate whether the statement is true or false
The temperature of a quantity of an ideal gas is
a. one measure of its ability to transfer thermal energy to another body. b. proportional to the average molecular kinetic energy of the molecules. c. proportional to the internal energy of the gas. d. correctly described by all the statements above. e. correctly described only by (a) and (b) above.
In some countries the AC frequency is 50 Hz. What is the time interval for one cycle at this frequency?
a. 0.0050 s c. 2 s b. 0.020 s d. 50 s