The Moon's orbit around the Earth is tilted by about 5 degrees with respect to Earth's orbit around the Sun. As a result, the approximate number of solar eclipses that occur each year is approximately
A) 0. B) 24. C) 12. D) 2.
D
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A 2.5-mC charge is on the y-axis at y = 3.0 m and a 6.3-mC charge is on the x-axis at x = 3.0 m. What is the direction of the potential at the origin?
A. 22.0
B. 168
C. 292
D. 332
E. potential has no direction
In Bohr's model of the atom, electrons
A) only make transitions between orbitals of specific energies. B) are not confined to specific orbits. C) are spread uniformly through a large, positive mass. D) can be halfway between orbits. E) move from orbit to orbit in many small steps.
Which of the following methods allows us to determine the size of an extrasolar planet around another star?
A) detection of brightness changes in a star as a planet passes in front of it B) detection of reflected starlight C) regular changes in the positions of the parent stars with respect to more distant stars as they move across the sky D) detection of Doppler shifts in the spectra of the parent stars
What is the net power radiated by a little animal with a surface area of 0.075 m2 if his emissivity is 0.75, his skin temperature is 315 K, and he is in a room with a temperature of 290 K? (? = 5.67 × 10-8 W/m2 ? K4 )
A) 8.8 W B) 6.0 W C) 8.0 W D) 15 W E) 18 W