The energy in the Sun's core is produced by
A. the chemical reaction of hydrogen and helium.
B. the release of gravitational potential energy.
C. the fusion of hydrogen to helium.
D. radioactive decay.
Answer: C
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A block of wood has specific gravity 0.80 . When placed in water, what percent of the volume of the wood is above the surface?
a. 0, the block sinks. b. 20% c. 80% d. 50% e. 100%
Once a terrestrial planet had formed from a large number of planetesimals, heat could have melted it and allowed it to differentiate into metallic core of ____density and a rocky mantle or crust of ______ density
a. higher; lower b. lower; higher c. Wrong! The interior stays solid d. Wrong! There is no separation according to density.
Which of the following is not a feature of central dominant galaxies?
A) They're found in clusters of galaxies. B) They are spiral galaxies. C) They often have multiple galactic nuclei. D) They are thought to form through the mergers of smaller galaxies.
Ideal incompressible fluid flows through a 4.0-cm-diameter pipe at 1.0 m/s. There is a 2.0 cm diameter constriction in the line. What is the speed of the fluid in this constriction?
A) 0.25 m/s B) 0.50 m/s C) 2.0 m/s D) 4.0 m/s