The Large and Small Magellanic Clouds fall into Hubble's class:
A) SBc.
B) Pec.
C) E6.
D) Irr I.
E) E3.
D
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What is the limiting angle of resolution, in degrees, for a microscope with an objective 0.50 cm in diameter when viewing is done at 590 nm?
A. 
B. 
C. 
D. 
E. 
Standing Sound Waves: A standing wave of the third overtone is induced in a 1.2-m pipe that is open at one end and closed at the other end. The speed of sound in the pipe is 340 m/s. (a) How many antinodes are there in the standing wave pattern?(b) What is the frequency of the sound produced by the pipe in this situation?
Fill in the blank(s) with the appropriate word(s).
The following graph shows multiple transit events recorded while observing a star. The colored arrows indicate transits caused by three different planets. Rank the orbital periods of these planets, from shortest to longest.
What will be an ideal response?
Which type of heat transfer is used in most automobile engines to carry excess heat away from the hot engine?
A. natural convection of air falling over the cooling land B. forced convection air or force convection of water C. forced convection of water D. natural convection of air rising over the warming land