When the Sun is located near one of the horizons, an observer looking at the sky directly overhead will view partially polarized light. This effect is due to which of the following processes?
a. double refraction
c. selective absorption
b. optical activity
d. reflection
D
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What does a waxing gibbous moon mean?
a. The changing Moon between full moon and third quarter b. The changing Moon between third quarter and new moon c. The changing Moon between first quarter and full moon d. The changing Moon between new moon and first quarter e. The changing Moon between first and third quarters
A series LRC ac circuit has a peak current of 1.0 A with a frequency of 54 kHz. If the resistance of the circuit is 51 k?, the capacitance of the circuit is 19 ?F, and the inductance of the circuit is 25 ?H, determine the average power of the circuit
A) 26 kW B) 77 kW C) 7.7 kW D) 4.1 kW
Twenty-five identical molecules are in a box. Microstates are designated by identifying the molecules in the left and right halves of the box. The multiplicity of the configuration with 15 molecules in the right half and 10 molecules in the left half is:
A. 1.03 × 1023 B. 3.27 × 106 C. 150 D. 25 E. 5
Carla and Jenny are arguing about whether or not it is possible to escape the gravitational field of the Earth. Carla shows Jenny a system where mass m is rE (not the Earth's radius) distant from Earth and rP (not planet P's radius) distant from planet P, the mass being on the line connecting the Earth and planet P. Carla states that the mass m has escaped if FP on m = ?FE on m. Jenny disagrees. Which one, if either, is correct, and why?
A. Carla, because the total gravitational force on m is zero at that point. B. Carla, because there is no gravitational force from Earth on m at that point. C. Carla, because there is no gravitational force on m from Earth when r>rE. D. Jenny, because there is a gravitational force on m from Earth no matter how great the distance from the Earth. E. Jenny, because the gravitational force from the Earth can only be blocked by a body that is larger than the Earth.