What advantage is there in referring to a star by its Greek-letter designation and constellation name rather using its traditional name?
What will be an ideal response?
More information is conveyed; the Greek-letter designation generally corresponds to the brightness of the star, and the constellation describes where in the sky the star is located.
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Describe the location of Polaris in the sky relative to the horizon as seen by observers in Alaska (lat. = 60° N), Texas (lat. = 33° N), Ecuador (lat. = 0°), and Australia (lat. = 30° S)
What will be an ideal response?
Conservation of Momentum: A dinner plate falls vertically to the floor and breaks up into three pieces, which slide horizontally along the floor. Immediately after the impact, a 320-g piece moves along the +x-axis with a speed of 2.00 m/s and a 355-g piece moves along the +y-axis with a speed of 1.50 m/s. The third piece has a mass of 100 g. In what direction relative to the +x-axis does the third piece move?
A. 216.9° from the +x-axis B. 219.8° from the +x-axis C. 36.9° from the +x-axis D. 39.9° from the +x-axis E. 39.8° from the +x-axis
How can we tell that the Moon is held in orbit around Earth by a force?
A. One side of the Moon is always facing Earth. B. The Moon's gravity creates tides in Earth's oceans. C. The Moon is always at the same distance from Earth. D. Earth's gravitational force pulls inward on the Moon. E. The Moon follows a curved path as it orbits.
RLC Circuits: A 120-V rms signal at 60 Hz is applied across a series combination of a 30-mH inductor and a 100-? resistor. What is the rms value of the current in this circuit?
A. 0.80 A B. 1.2 A C. 1.4 A D. 1.6 A E. 1.8 A