Salt water has greater density than fresh water. A boat floats in both fresh water and in salt water. Where is the buoyant force greater on the boat?
A) salt water
B) fresh water
C) Buoyant force is the same in both.
D) Cannot be determined from the information given.
C
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During the hydrogen shell burning phase
A) the star grows more luminous. B) the star becomes less luminous. C) helium is burning in the core. D) the core is expanding. E) hydrogen is burning in the central core.
The intricate patterns visible in an X-ray image of the Sun generally show ________
A) structure within sunspots B) a bubbling pattern on the photosphere C) helioseismological fluctuations D) extremely hot plasma flowing along magnetic field lines
Which of these are physical quantities?
a. time b. energy c. seconds d. kilometers e. volume
A friend says that changing electric and magnetic fields underlie the production of light
A) agree with your friend B) disagree with your friend C) find a new friend