Which of the following, along with O2, is an allotrope of oxygen?
a. O3
b. O2-
c. O
d. O4
a
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A long solenoid (1000 turns/m) carries a current of 25 mA and has an inside radius of 2.0 cm. A long wire which is parallel to and 4.0 cm from the axis of the solenoid carries a current of 6.0 A. What is the magnitude of the magnetic field at a point on the axis of the solenoid?
A. 51 ?T B. 61 ?T C. 43 ?T D. 81 ?T E. 1.4 ?T
A person carries a mass of 10 kg and walks along the +x-axis for a distance of 100m with a constant velocity of 2 m/s. What is the work done by this person?
A) 0 J B) 20 J C) 200 J D) 1000 J E) None of the other choices is correct.
Jupiter's "striped" appearance is a result of
A) alternating bands of rising and falling air at different latitudes. B) alternating bands of liquid and gaseous material at different latitudes. C) changes in the atmospheric composition with latitude. D) changes in the strength of Jupiter's magnetic field with latitude.
Sir William Herschel counted the number of stars in different directions, and getting similar numbers in each direction along the disk, concluded the Sun was near the center of a disk like collection of stars. Herschel came to the wrong conclusion about the Sun's location because
A. He did not know that interstellar dust made it hard for him to see a large part of the Milky Way's disk. B. The Sun's position in the Milky Way at that particular time was very unusual and skewed his results. C. He only counted globular clusters, and not regular stars. D. He was predisposed to believe the Sun was in the center of the Milky Way, and ignored data which disagreed with that conclusion.