A convex mirror has a focal length of -20 cm. What is the object distance if the image distance is -10 cm?
a. 10 cm
b. 40 cm
c. 60 cm
d. 20 cm
e. 30 cm
D
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According to Kepler's Second Law of planetary motion, a planet moves fastest in its orbit when it is
A) undergoing retrograde motion B) in between perihelion and aphelion C) at perihelion D) at aphelion
What process has shaped Earth's surface more than any other?
A) impact cratering B) wind erosion C) acid rain D) volcanism E) plate tectonics
The solar neutrinos observed on Earth come from the hot spots in the corona
Indicate whether the statement is true or false
Order these objects by size (radius) from smallest to largest:
A) 3 solar mass black hole, 3 solar mass neutron star, 0.5 solar mass white dwarf, 1 solar mass white dwarf. B) 0.5 solar mass white dwarf, 1 solar mass white dwarf, a 3 solar mass neutron star, a 3 solar mass black hole. C) 3 solar mass neutron star, 3 solar mass black hole, 1 solar mass white dwarf, 0.5 solar mass white dwarf. D) 3 solar mass black hole, 3 solar mass neutron star, 1 solar mass white dwarf, 0.5 solar mass white dwarf. E) 0.5 solar mass white dwarf, 1 solar mass white dwarf, a 3 solar mass black hole, a 3 solar mass neutron star. F) 1 solar-mass white dwarf, 0.5 solar-mass white dwarf, a 3 solar-mass neutron star, a 3 solar-mass black hole.