A long, straight wire carrying a current is placed along the y-axis. If the direction of the current is in the +y direction, what is the direction of the magnetic field due to this wire?
A) clockwise, around the x-axis
B) counterclockwise, around the x-axis
C) counterclockwise, around the z-axis
D) counterclockwise, around the y-axis
E) clockwise, around the y-axis
D
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Indicate whether the statement is true or false
A car has a mass of 1000 kg and accelerates at 2 m/s2. What net force is exerted on the car?
A) 500 N B) 1000 N C) 1500 N D) 2000 N E) none of these
How can we tell that some stars are relatively close to us in the sky?
a. Some stars are occasionally eclipsed by the Moon, so they must be nearby. b. Some stars vary in brightness caused by sunspots we can see because they are so close. c. Some stars appear to be extremely bright and must therefore be very close to us. d. Some stars appear to move periodically back and forth against the background stars because of Earth's movement around the Sun.
This diagram shows the life tracks from protostar to the main sequence for several stars of different masses. Which track represents the star that takes the longest amount of time to reach the main sequence?
A) Track 1 B) Track 2 C) Track 3 D) Track 4 E) Track 5