Which of the following is the coldest at its surface?
A. white dwarf
B. type K main sequence star
C. main sequence star with a radius ten times the Sun's radius
D. 3 solar luminosity main sequence star
E. blue main sequence star
Ans: B. type K main sequence star
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Work-Energy Theorem: The kinetic friction force that a horizontal surface exerts on a 60.0-kg object is 50.0 N. If the initial speed of the object is 25.0 m/s, what distance will it slide before coming to a stop?
A. 15.0 m B. 30.0 m C. 375 m D. 750 m
Together the Cassini spacecraft and its probe Huygens discovered which of the following features on Titan?
A. dunes of ice crystals B. lakes near the polar regions C. an ice volcano D. river networks E. All of these choices are correct.
A double-slit interference experiment is performed in the air. Later, the same apparatus is immersed in benzene (index of refraction, n = 1.50), and the experiment is repeated
When the apparatus is in benzene, you observe the interference fringes to be A) more closely spaced as when the apparatus is in air. B) equally spaced as when the apparatus is in air. C) more widely spaced as when the apparatus is in air. D) Impossible to tell without knowing the wavelength of light in use. E) Impossible to tell without knowing the separation between the slits.
A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 27-6
If there is a current I flowing through this coil, what is the direction of the force acting on section AB of this coil? A) perpendicular to and into the page B) perpendicular to and out of the page C) in the direction of the magnetic field D) in the opposite direction of the magnetic field E) none