If a virtual image is formed 14.5 cm along the principal axis from a convex mirror of focal length –19.5 cm, how far is the object from the mirror?
a. 56.6 cm
b. 14.5 cm
c. 5.00 cm
d. 20.0 cm
e. 6.80 cm
a
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star Arcturus is a red giant that is easily visible in the night sky. Based on models of stellar evolution, what is happening to Arcturus as this stage of its life?
A) It is increasing in size, and hydrogen fusion reactions are occurring in a shell around the core. B) It is stable in its size, and hydrogen fusion reactions are occurring in its core. C) It is decreasing in size, and hydrogen fusion reactions are occurring in its core. D) It is increasing in size, and hydrogen fusion reactions are occurring in its core. E) It is decreasing in size, and hydrogen fusion reactions are occurring in a shell around the core. F) It is stable in its size, and hydrogen fusion reactions are occurring in a shell around the core.
Jupiter emits about two times as much energy as it receives from the Sun because
a) nuclear fusion b) its magnetosphere catches particles that collisional c) volcanoes on the rocky core make the heat d) it is still radiating heat from its collapse e) nuclear fission
What is pseudoscience?
What will be an ideal response?
Which of these (hypothetical) modifications would cause lunar eclipses to happen once per month?
A) Change the Moon's orbital plane so it tilts the opposite way. B) Change the orbital plane of the Moon so it lies in the same plane as Earth's orbit around the Sun. C) Relocate the Moon to twice its current distance from the Earth. D) Make the Moon orbit the Earth twice as fast.