Standing Waves on a String: Standing waves of frequency 17 Hz are produced on a string that has a mass per unit length of 0.0160 kg/m. To what tension must the string be stretched between two supports if adjacent nodes in the standing wave are to be 0.87 m apart?
Fill in the blank(s) with the appropriate word(s).
14 N
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Spherical Mirrors: Suppose you place an object in front of a concave mirror. Which of the following statements must be true? (There could be more than one correct choice.)
A. The image of the object will always be smaller than the object. B. No matter where you place the object, a real image of the object will be formed. C. The image of the object will always be inverted. D. If you position the object between the mirror and the focal point of the mirror, its image must be upright and virtual. E. No matter where you place the object, the image of the object will always be virtual and upright.
Which of the following observations is not a piece of evidence that lends support to aspects of the Big Bang theory?
A) the darkness of the night sky B) the expansion of the universe C) the observed helium abundance in the universe D) the relative motions of galaxies in the Local Group
What are the primary reasons for making telescopes larger?
a. to make things look bigger b. to decrease image resolution c. to collect more light to so faint objects can be seen d. to see a larger part of the sky
A locomotive is pulling 19 freight cars, each of which is loaded with the same amount of weight
The mass of each freight car (with its load) is 37,000 kg. If the train is accelerating at 0.22 m/s2 on a level track, what is the tension in the coupling between the second and third cars? (The car nearest the locomotive is counted as the first car, and friction is negligible.)