In the heliocentric (Sun-centered) model, apparent retrograde motion is due to
A) relative motion between the Earth and another planet in its orbit
B) the Earth reversing the direction of its orbit about the Sun
C) a planet moving in a small circle, the center of which moves in a larger circle about the Earth
D) a planet reversing the direction of its orbit about the Sun
A
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Why does the temperature of the corona rise with latitude? a. Atoms undergo fission when repelled by the corona
b. Atoms become neutralized as they dissipate in higher altitudes. c. Atoms within the corona become more ionized at higher altitudes. d. Atoms are forced upward from the chromosphere to the corona. e. Atoms are less excited as they move from the photosphere to the corona.
Suppose that the energy difference between adjacent energy levels for an oscillator in an Einstein solid is ? = 0.005 eV. At room temperature, the value of T/TE is
A. quite a bit smaller than 1 B. about equal to 0.5. C. about equal to 1. D. about equal to 2. E. quite a bit larger than 2. F. One doesn’t have enough information to tell.
An airplane flies in a horizontal circle of radius 500 m at a speed of 150 m/s. If the radius were changed to 1000 m, but the speed remained the same, by what factor would its centripetal acceleration change?
a. 0.25 b. 0.50 c. 1.00 d. 2.00 e. 4.00
It is possible to have a zero acceleration, and still be moving
Indicate whether the statement is true or false