Which of the following terms is given to a pair of stars that appear to change positions in the sky, indicating that they are orbiting one another?
A) visual binary
B) eclipsing binary
C) spectroscopic binary
D) double star
E) none of the above
A
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A 2.0-kg particle has an initial velocity of 
m/s. Some time later, its velocity is
m/s. How much work was done by the resultant force during this time interval, assuming no energy is lost in the process?
A. 17 J B. 49 J C. 19 J D. 53 J E. 27 J
The magnetic field lines about a current-carrying wire form _______.
A. eddy currents B. circles C. spirals D. radial lines
At what speed is the relativistic momentum five times the value calculated classically?
A. 0.99 c B. 0.98 c C. 0.96 c D. 0.80 c E. 0.20 c
The "triple point" of a substance is that point for which the temperature and pressure are such that:
A. only solid and liquid are in equilibrium B. only liquid and vapor are in equilibrium C. only solid and vapor are in equilibrium D. solid, liquid, and vapor are all in equilibrium E. the temperature, pressure and density are all numerically equal