A 50-gram sample of dry ice (solid CO2) is placed in a 4-liter container. The system is sealed and allowed to reach room temperature (20°C). By approximately how much does the pressure inside the container increase when the dry ice turns to gas? (Ignore the initial volume of the sample.)
the pressure increases by about 7 atm
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Does Hubble's law work well for galaxies within the Local Group? Why or why not?
A) no, because galaxies in the Local Group are gravitationally bound together B) no, because Hubble did not know the Local Group existed when he discovered his law C) no, because we do not know the precise value of Hubble's constant D) Yes, it works so well that we have never detected any measurable deviations from its predictions.
One advantage of the Hubble Space Telescope over ground based ones is that
A) it can make better observations of the ozone layer. B) it can better focus X-ray images. C) its adaptive optics controls atmospheric blurring better. D) in orbit, it can operate close to its diffraction limit at visible wavelengths. E) it is larger than any Earth-based telescopes.
Four resistors are connected across an 8-V DC battery as shown in the figure. The current through the 9-? resistor is closest to
A fish is 80 cm below the surface of a pond. What is the apparent depth (in cm) when viewed from a position almost directly above the fish? (For water, n = 1.33.)
A. 50 B. 60 C. 40 D. 70 E. 110