You measure the parallax angle for a star to be 0.1 arcseconds. The distance to this star is
A) 10 light-years.
B) 0.1 light-year.
C) 0.1 parsec.
D) 10 parsecs.
E) impossible to determine.
D
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Elliptical galaxies contain more gas, dust, and young stars than do Sa galaxies
a. True b. False Indicate whether the statement is true or false
When an electron passes through the magnetic field of a horseshoe magnet, the electron's
A) speed is increased. B) direction is changed. C) both of these D) neither of these
In a thermodynamic process, the internal energy of a system in a container with adiabatic walls decreases by 800 J. Which statement is correct?
a. The system lost 800 J by heat transfer to its surroundings. b. The system gained 800 J by heat transfer from its surroundings. c. The system performed 800 J of work on its surroundings. d. The surroundings performed 800 J of work on the system. e. The 800 J of work done by the system was equal to the 800 J of heat transferred to the system from its surroundings.
A rod (length = 10 cm) moves on two horizontal frictionless conducting rails, as shown. The magnetic field in the region is directed perpendicularly to the plane of the rails and is uniform and constant. If a constant force of 0.60 N moves the bar at a constant velocity of 2.0 m/s, what is the current through the 12-? load resistor?
a.
0.32 A
b.
0.34 A
c.
0.37 A
d.
0.39 A
e.
0.43 A