A cross section of the magnetic field for a current-carrying wire is shown. The direction of the current is
A. to the left.
B. to the right.
The direction of the current is (A) to the left. The fingers are curling out of the paper below the wire, as shown in the B field diagram.
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What is responsible for much of the erosion of Earth's surface?
a. lava flows b. solar wind c. impact craters d. convection e. water
The object shown below has mass m and velocity 
. The direction of its angular momentum vector with respect to an axis perpendicular to the page through point O is
a.
downwards.
b.
to the right.
c.
into the page.
d.
up out of the page.
e.
counterclockwise.
_________________ have the highest electrical conductivity at room temperature.
(a) Metals (b) Semiconductors (c) Insulators (d) Superconductors
If the force of gravity exerted on the Sun by Earth is the same as the force exerted by Earth on the Sun, why does Earth orbit the Sun, and not the other way around?
A. They each orbit around the geometric center of the system. B. Earth is less massive, and is accelerated more by the gravitational force and moves faster. C. Planets, by definition, orbit the Sun, and not the other way around. D. The combined gravitational forces of all the planets keeps the Sun at the center of the Solar System. E. None of these choices is correct.