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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A 10. kg mass, hung onto a spring, causes the spring to stretch 2.0 cm. The spring constant is
A) 5.0 N/cm B) 49 N/cm C) 0.20 N/cm D) 20. N/m E) 0.0020 N/cm
Tables based on a heliocentric model of the universe which used elliptical orbits for the planets were more accurate than ____________________
Fill in the blank(s) with correct word
Good tracers of the spiral arms of our galaxy are all I. very old. II. very young. III. very luminous. IV. moving with large radial velocities
a. I & III b. I & IV c. II & III d. II & IV e. I, III, & IV
A sealed hot air balloon is capable of rising to high altitudes when it is initially released. As the air in the balloon cools, however, it eventually comes back down to the ground because
A. objects can only float in a fluid if their density is less than that of the fluid. B. what goes up must come down. C. objects heavier than air can only fly through the air with the help of a motor. D. the object comes down when the air in it eventually leaks out.