Density: A hollow sphere of negligible mass and radius R is completely filled with a liquid so that its density is ?. You now enlarge the sphere so its radius is 2R and completely fill it with the same liquid. What is the density of the enlarged sphere?
A. 8 ?
B. 4 ?
C. ?/2
D. ?
E. ?/8
Answer: D
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A motorboat that normally travels at 8 km/h in still water heads directly across a 6-km/h flowing river. The resulting speed of the boat is about
A) 6 km/h. B) 8 km/h. C) 10 km/h. D) 20 km/h.
The light radiated from the Sun's surface reaches Earth in about 8 minutes, but the energy of that light was released by fusion in the solar core about
A) a hundred years ago. B) a thousand years ago. C) tens of thousands of years ago. D) hundreds of thousands of years ago. E) a million years ago.
An incredibly dense star so massive that light cannot escape from its surface is called a _______________
a. red giant b. black hole c. white dwarf d. pulsar
Consider an LRC circuit. The impedance of the circuit increases if R increases. When is this statement true?
A) always true B) true only if XL is less than or equal to XC C) true only if XL is greater than or equal to XC D) true only if XL is equal to XC E) never true