What is the nearest huge cluster of thousands of galaxies, to which the Local Group may belong?
A) The Great Wall
B) Virgo Cluster
C) Sagittarius Cluster
D) Corona Borealis Cluster
E) Coma Cluster
B
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One number has three significant figures and another number has four significant figures. If these numbers are added, subtracted, multiplied, or divided, which operation can produce the greatest number of significant figures?
A. the addition B. the subtraction C. the multiplication D. the division E. All the operations result in the same number of significant figures.
What current must be maintained in a square loop (50 cm on a side) to create a torque of 1.0 N / m about an axis through its center and parallel to one of its sides when a magnetic field of magnitude 70 mT is directed at 40° to the plane of the loop?
a. 66 A b. 89 A c. 61 A d. 75 A e. 37 A
The electric fields arriving at a point P from three coherent sources are described by E1 = E0 sin ?t, E2 = E0 sin (?t + ?/4) and E3 = E0 sin (?t + ?/2). Assume the resultant field is represented by Ep = ER sin (?t + ?). The amplitude of the resultant wave at P is
a. E0. b. 1.5E0. c. 1.7E0. d. 2.4E0. e. 2.9E0.
How can the accuracy of a measurement be increased?