Mercury's smooth plains are probably the oldest parts of the crust
Indicate whether the statement is true or false
F
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The signs of the zodiac are important to astronomy as they influence the seasons on Earth
Indicate whether the statement is true or false
A straight wire is bent into the shape shown. Determine the net magnetic force on the wire
when the current I travels in the direction shown in the magnetic field
.
?
a.
2IBL in the ?z direction
b.
2IBL in the +z direction
c.
4IBL in the +z direction
d.
4IBL in the ?z direction
e.
zero
If an object's speed is constant, its velocity must also be constant
Indicate whether the statement is true or false
Compared to the central regions of spiral galaxies, we expect elliptical galaxies to have
A) higher mass-to-light ratios because stars in elliptical galaxies are dimmer than those in spirals. B) lower mass-to-light ratios because stars in elliptical galaxies are dimmer than those in spirals. C) higher mass-to-light ratios because stars in elliptical galaxies do not have high orbital velocities. D) lower mass-to-light ratios because elliptical galaxies have less gas and dust than spirals. E) the same mass-to-light ratio because they are made of the same material, stars and dark matter.