A surface of erosion between rocks that represents a gap in Earth history is
A) called a dike.
B) an unconformity.
C) a faunal conformity.
D) none of the above
Answer: B
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Work Done by a Gas: While 3.0 moles of gas expand from an initial volume of 0.040 m3 to a final volume of 0.085 m3, the temperature of the gas is kept fixed at 300 K. How much work does the gas do during this expansion? (R = 8.31 J/mol ? K)
A. 5.6 kJ B. 6.6 kJ C. 7.6 kJ D. 8.6 kJ E. 14 kJ
Rank the magnitudes of the forces exerted on the following particles from largest to smallest. In your ranking, display any cases of equality
(a) an electron moving at 1 Mm/s perpendicular to a 1-mT magnetic field (b) an electron moving at 1 Mm/s parallel to a 1-mT magnetic field (c) an electron moving at 2 Mm/s perpendicular to a 1-mT magnetic field (d) a proton moving at 1 Mm/s perpendicular to a 1-mT magnetic field (e) a proton moving at 1 Mm/s at a 458 angle to a 1-mT magnetic field
1.d > a = c > b > f 2.a > c > d > b = c 3.c > a = d > e > b 4.b > f > c > d > a 5.b > c > a > f > dSatellite Motion: The captain of a spaceship orbiting planet X discovers that to remain in orbit at 410 km from the planet's center, she needs to maintain a speed of 68 m/s. What is the mass of planet X? (G = 6.67 × 10-11 N ? m2/kg2)
A. 2.8 × 1019 kg B. 4.2 × 1017 kg C. 2.8 × 1016 kg D. 4.2 × 1014 kg
Hydrostatic equilibrium is the balance between ________ of a star and ________.
A. the size; energy production B. the internal pressure; gravity C. hydrogen fusion; temperature D. the internal pressure; energy production