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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Choose the answer that fills in the three blanks in the correct order: Earth rotates once each ________, Earth orbits the Sun once each ________, and the Moon orbits Earth about once each ________.
A) day, year, month B) day, year, week C) year, day, month D) hour, day, year E) hour, day, month
Assume that an interionic pair potential between K+ and Cl– ions can be approximated by Equation 2.15. Assume that the repulsive ion core interactions can be modeled with a power of m=12. Experimentally it has been determined that the energy to separate one pair of K+ and Cl– ions is 5.0 eV, and that the equilibrium interionic separation is equal to 0.266 nm. Use this experimental data to determine the value of B for an ion pair. Use the SI system of units for this problem.
What will be an ideal response?
Charge of uniform surface density (4.0 nC/m2) is distributed on a spherical surface (radius = 2.0 cm). What is the total electric flux through a concentric spherical surface with a radius of 4.0 cm?
a. 2.8 N × m2/C b. 1.7 N × m2/C c. 2.3 N × m2/C d. 4.0 N × m2/C e. 9.1 N × m2/C
How are T Tauri stars characterized observationally?
A) by sudden changes in their brightness B) by very high temperatures C) by very high magnetic fields and large starspots D) by very rapid rotation E) They are newly-formed stars that are short period binaries.