Two sources of waves, call them A and B, send out waves across the surface of a lake. The waves from A have crests 1 cm high as measured from the normal undisturbed surface of the water. The waves from B are identical to those from A
How far is the water displaced at a point where a crest from A crosses a valley from B?
A) 2 cm upward
B) zero
C) 1 cm upward
D) 1 cm downward
E) 2 cm downward
B
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When we analyze whether a world is a possible home to life, the key thing we look for is ________
A) surface coloration changes that could indicate vegetative growth B) evidence of atmospheric oxygen C) the past or present existence of liquid water D) the presence of organic molecules such as amino acids
Winds on Mars give rise to planet-wide dust storms
Indicate whether the statement is true or false
Which one of the following choices is not a possible way to produce a magnetic field?
a) Set up a current in a long, straight wire. b) Uniformly distribute charges over the surface of a conductor. c) Make an object out of materials that have an intrinsic magnetic field. d) Pass a current through a coil of wire.
Which of the following statements is not true of the object known as Sgr A* in the center of our Galaxy?
A) It is by far the brightest source of visible light lying in the direction of the galactic center. B) It is thought to harbor a black hole of more than 3 million solar masses. C) It is a source of bright radio emission. D) It is a source of X-ray emission that we have observed with telescopes in space.