Suppose that a bar magnet moves vertically upward toward the origin (point O), as shown below and left. 
In this situation, specify the directions of each of the vector quantities described below. Use the answer chart provided above and to the right (note that answers B and E refer to the +y and -y directions, respectively). What is the direction of 
at the origin (point O)?
A. A
B. B
C. C
D. D
E. E
F. F
T. Zero
D. D
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Which of the following objects is considered to possibly contain a black hole?
a. the central star of the Crab nebula b. the Orion nebula. c. LMC X-3 d. Algol e. PSR 1257+12
The two forms of electromagnetic (E-M) radiation that experience the least atmospheric opacity are
A) visible light and infrared waves. B) X and gamma radiation. C) microwaves and radio waves. D) ultraviolet and infrared waves. E) visible light and radio waves.
Refer to the diagram of Racetrack X. 
Refer to the diagram of Racetrack X. It is ________ for a racer to have uniform acceleration ________ on this track.
A. possible; everywhere B. guaranteed; at some places C. impossible; anywhere D. impossible; at some places
You can add heat without raising temperature to
A) ice. B) boiling water. C) both of these D) neither of these