Addition by Components: A car travels 20 km west and then 20 km south. Use components to find the magnitude of its displacement vector?
A. 0 km
B. 20 km
C. 28 km
D. 40 km
Answer: C
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Polarization: The following items are positioned in sequence: A source of a beam of natural light of intensity I0, three ideal polarizers A, B, and C; and an observer. Polarizer axis angles are measured clockwise from the vertical, as viewed by the observer. The axis angle of polarizer A is set at 0° (vertical), and the axis angle of polarizer C is set at 50°. Polarizer B is set so that the beam intensity at the observer is a maximum. What is the axis angle settings of polarizer B?
A. 0° B. 25° C. 50° D. 75° E. 100°
What is the Great Red Spot?
A) a hurricane that comes and goes on Jupiter B) a long-lived, high-pressure storm on Jupiter C) a place where reddish particles from Io impact Jupiter's surface D) a region on Jupiter where the temperature is so high that the gas glows with red visible light
Optical SETI is useful for
A) focused communication over short distances and in particular directions B) communication over wide areas and large distances C) communication over large distances in directions where interstellar dust is not present D) communication with civilizations which surround similar stars to our Sun and hence have evolved to see visible radiation
A rectangular coil (0.20 m × 0.80 m) has 200 turns and is in a uniform magnetic field of 0.30 T. When the orientation of the coil is varied through all possible positions, the maximum torque on the coil by magnetic forces is 0.080 N × m. What is the current in the coil?
a. 5.0 mA b. 1.7 A c. 8.3 mA d. 1.0 A e. 42 mA