All of the following are true. Which of the following gives evidence that Earth's orbit is not perfectly circular?
A) The Sun's angular size changes throughout the year.
B) The Sun's daily path through the local sky varies over the course of the year.
C) In North America, it is hotter in July than January.
D) The Earth's axis precesses gradually with a period of about 26,000 years.
A) The Sun's angular size changes throughout the year.
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Astronomers conclude that quasars must come from the earliest phases of the Universe because they ____
a. have supermassive black holes b. are colliding with other galaxies c. create jets d. have large redshifted spectra e. have a fluctuating luminosity
If the radiant energy from the Sun comes in as a plane EM wave of intensity 1340 W/m2, calculate the peak values of E and B.
A. 300 V/m, 10?4 T B. 1000 V/m, 3.35 × 10?6 T C. 225 V/m, 1.60× 10?3 T D. 111 V/m, 3.00 × 10?5 T E. 711 V/m, 2.37 × 10?6 T
Which of these is not a form of solar energy?
A) wind energy B) fossil fuel energy C) geothermal energy D) hydroelectric power
If an object isn't moving, no external forces act on it
1.True 2.False