Which of the following is NOT a method used by astronomers to detect and study exoplanets?
A. direct imaging
B. gravitational lensing
C. rotational mapping
D. doppler shift
E. transit detection
Answer: C
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____________ galaxies contain a supermassive black hole at their centers while active nuclei are present in ____________of galaxies
a. Most; a few percent b. Most; the majority c. A small minority; a few percent d. A small minority; the majority
What have studies of sunquakes, or helioseismology, revealed?
A) The Sun vibrates only on the surface. B) "Sunquakes" are caused by similar processes that create earthquakes on Earth. C) The Sun generates energy by nuclear fusion. D) Our mathematical models of the solar interior are fairly accurate. E) Neutrinos from the solar core reach the solar surface easily.
A truck is towing a car whose mass is one quarter that of the truck. The force exerted by the truck on the car is 6000 N. The force exerted by the car on the truck is
A) 1500 N. B) 24000 N. C) 3000 N. D) 6000 N. E) 12000 N.
Does an electric field exert a force on a moving charged object? Assume the motion of the charged object is along the x axis and the field is in the y direction
1.yes 2.no