In any particular place on Earth, certain constellations are visible in the evening only at certain times of the year because
A) our evening view of space depends on where Earth is located in its orbit around the Sun.
B) during some times of year, some constellations drop below the southern horizon.
C) some constellations are circumpolar.
D) on any particular night, we can only see stars that are directly opposite (180 degrees away from) the Sun in the sky.
A
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One cat meowing produces a sound intensity level of 55. db
(a) What would be the sound intensity level of 2 cats meowing? (b) ... of 10 cats meowing? (c) ... of 100 cats meowing?
A charge of 8.0 pC is distributed uniformly on a spherical surface (radius = 2.0 cm), and a second charge of ?3.0 pC is distributed uniformly on a concentric spherical surface (radius = 4.0 cm). Determine the magnitude of the electric field 5.0 cm from the center of the two surfaces
a. 14 N/C b. 11 N/C c. 22 N/C d. 18 N/C e. 40 N/C
You are asked to design a coil to operate in air that will produce a flux density of 0.01T. The maximum current for the coil wire is 1 A, and the space available for the coil limits the length to 1 cm. How many loops are required for this coil? Round your answer to the nearest whole number.
What will be an ideal response?
What is Jupiter's Great Red Spot?
A) a giant storm that is about twice as wide as the planet Earth B) a giant crater on the surface of Jupiter C) a portion of strongly heated gas near the surface of Jupiter caused by a collision with a comet D) a huge patch of sulfur in Jupiter's atmosphere E) reflected sunlight that is red for the same reason sunrises and sunsets are red on Earth