The acceleration of a ball as it rolls down a ramp is 3 m/s2 . It starts from rest. (a) What is the ball's speed after 4 seconds? (b) How far does the ball travel during the 4 seconds?
Question 2
How would a compass needle align itself in the magnetic field shown in this figure?
a. It would align itself along the magnetic field lines circling the wire, with the north pole of the compass pointing clockwise.
b. It would align itself along the magnetic field lines circling the wire, with the north pole of the compass pointing counterclockwise.
c. The compass needle aligns perpendicular to the magnetic field with its north pole pointing directly at the wire.
d. The compass needle aligns perpendicular to the magnetic field with its north pole pointing directly away from the wire.
e. The direction the compass tends to point is up out of the page, but it cannot rotate that way, and it therefore does not respond to the magnetic field.
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