Which element is critical to the formation of the volcanic surface of Io?
A) silicon B) sulfur C) phosphorus D) iron E) carbon
B
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Torque: A flat rectangular loop of wire carrying a 4.0-A current is placed in a uniform 0.60-T magnetic field. The magnitude of the torque acting on this loop when the plane of the loop makes a 30° angle with the field is measured to be 1.1 N ? m. What is the area of this loop?
A. 0.20 m2 B. 0.40 m2 C. 0.26 m2 D. 0.80 m2 E. 0.53 m2
Which of the following is a method of heat transport that involves the movement of warm molecules of gas or liquid from one region to another?
a. Convection b. Conduction c. Radiation
Jupiter's colors come in part from its three layers of clouds. Which of the following is not the primary constituent of one of Jupiter's cloud layers?
A) clouds of sulfuric acid B) clouds of water C) clouds of ammonium hydrosulfide D) clouds of ammonia
An astronomical telescope has an objective lens with focal length fo and has an eyepiece with focal length fe. A second telescope has objective and eyepiece lenses with quadruple the focal length of the first telescope. Which telescope gives the greater magnification and by what factor?
a. The first telescope gives 16 times the magnification of the second. b. The second telescope gives 16 times the magnification of the first. c. Both telescopes give the same magnification. d. The actual focal lengths must be known to answer this question. e. The second telescope gives 4 times the magnification of the first.