At what longitude is an observer who sees the last-quarter moon on his meridian when it is 12:00 noon local solar time at 75°W?
a. 165°W
b. 15°E
c. 15°W
d. 165°E
e. 75°E
a
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A hollow cylindrical (inner radius = 2.0 mm, outer radius = 4.0 mm) conductor carries a current of 24 A parallel to its axis. This current is uniformly distributed over a cross section of the conductor. Determine the magnitude of the magnetic field at a point that is 5.0 mm from the axis of the conductor
a. 0.96 mT b. 1.7 mT c. 0.55 mT d. 1.2 mT e. 0.40 mT
A hockey puck slides off the edge of a horizontal platform with an initial velocity of 28.0 m/s horizontally in a city where the acceleration due to gravity is 9.81 m/s2. The puck experiences no significant air resistance as it falls
The height of the platform above the ground is 2.00 m. What is the angle below the horizontal of the velocity of the puck just before it hits the ground? A) 77.2° B) 72.6° C) 12.8° D) 12.6° E) 31.8°
Venus has a higher average surface temperature than Mercury. Why?
A) because it is closer to the Sun B) because its surface is heated by an extreme greenhouse effect C) because its surface is covered with hot lava from numerous active volcanoes D) because its slow rotation gives it more time to heat up in sunlight
Warm air has a higher capacity for water vapor, because in warm air
A) fast-moving water-vapor molecules are too energetic to stick together. B) molecules expand. C) water-vapor molecules condense. D) there are more water vapor molecules than in cool air.