Most of the asteroids orbit the Sun in a belt between the orbits of
a. Venus and Earth.
b. Earth and Mars.
c. Jupiter and Saturn.
d. Mercury and Venus.
e. Mars and Jupiter.
e
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A neutral metal ball is suspended by a string. A positively charged insulating rod is placed near the ball, which is observed to be attracted to the rod. This is because:
A) the ball becomes positively charged by induction B) the ball becomes negatively charged by induction C) the number of electrons in the ball is more than the number in the rod D) the string is not a perfect insulator E) there is a rearrangement of the electrons in the ball
Why do we think that RNA was probably the first self-replicating molecule?
A) it is able to replicate at high temperatures found near deep-sea ocean vents B) it is much simpler than DNA C) in laboratory studies researchers have shown that it is able to catalyze its own replication D) it is able to replicate using carbohydrates rather than proteins
The Earth is 1.49 × 10^11 meters from the Sun. If the solar radiation at the top of the Earth's atmosphere is 1340 W/m2, what is the total power output of the Sun?
a. 7.10 × 10^27 W b. 2.20 × 10^30 W c. 6.62 × 10^26 W d. 3.74 × 10^26 W e. 2.98 × 10^25 W
Two long parallel wires placed side-by-side on a horizontal table carry identical size currents in opposite directions
The wire on your right carries current toward you, and the wire on your left carries current away from you. From your point of view, the magnetic field at the point exactly midway between the two wires A) points upward. B) points downward. C) points toward you. D) points away from you. E) is zero.