When astronomers look at distant galaxies, what sort of motion do they see?
A. Galaxies are orbiting a single point in the Universe.
B. The galaxies are all moving rapidly toward us.
C. Galaxies in half of the sky are moving away from us. Those in the other half are approaching.
D. The galaxies are all moving rapidly away from us.
E. The galaxies are all spinning rapidly.
Answer: D
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Lenz's Law: A circular wire ring is situated above a long straight wire, as shown in the figure. The straight wire has a current I flowing to the right, and this current is increasing at a constant rate. Which of the following statements is true?
A. There is an induced current in the wire ring, directed in clockwise orientation. B. There is an induced current in the wire ring, directed in a counterclockwise orientation. C. There is no induced current in the wire ring.
It is impossible for a star to have a negative apparent magnitude, such as -1
Indicate whether the statement is true or false
A proton moves around a circular path (radius = 2.0 mm) in a uniform 0.25-T magnetic field. What total distance does this proton travel during a 1.0-s time interval? (m = 1.67 × 10^?27 kg, q = 1.6 × 10^?19 C)
a. 82 km b. 59 km c. 71 km d. 48 km e. 7.5 km
The graphs below represent current and voltage phasors at one instant of time. The solid arrows represent the voltage phasors, ?V, and the dashed arrows represent the current phasors, Imax.Which graph shows the correct relationship between current and voltage phasors for an inductor in an RL circuit?
a.
b.
c.
