What determines the amount of time that a particular star remains above your horizon any given day?
A) all three of your latitude, longitude, and the star's declination
B) your latitude and the star's declination only
C) your latitude and the star's right ascension only
D) your longitude and the star's declination only
E) your longitude and the star's right ascension only
B) your latitude and the star's declination only
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Circular Motion of Charges: A proton, moving in a uniform magnetic field, moves in a circle perpendicular to the field lines and takes time T for each circle. If the proton's speed tripled, what would now be its time to go around each circle?
A. 9T B. 3T C. T D. T/3 E. T/9
Why did the solar nebula flatten into a disk?
A) The interstellar cloud from which the solar nebula formed was originally somewhat flat. B) The force of gravity from the Sun pulled the material downward into a flat disk. C) As the nebula cooled, the gas and dust settled onto a disk. D) It flattened as a consequence of collisions between particles in the spinning nebula, changing random motions into more orderly ones. E) The force of gravity from the planets pulled the material downward into a flat disk.
If work was done on an object, the object must have
A. experienced a frictional force. B. accelerated. C. changed its position. D. changed only its direction of motion.
A proton is released from rest at the origin in a uniform electric field in the positive x direction with magnitude 850 N/C. What is the change in the electric potential energy of the proton–field system when the proton travels to x = 2.50 m?
1.3.40 × 10^-16 J 2.-3.40 × 10^-16 J 3.2.50 × 10^-16 J 4.-2.50 × 10^-16 J 5.-1.60 × 10^-19 J