The planetary model of the atom is a more detailed, or sophisticated, model than the simpler Greek model of the atom. The planetary model is useful because, unlike the Greek model, it can explain
A) the differences between the three states of matter.
B) electrical phenomena such as electric current.
C) the microscopic meaning of thermal energy.
D) certain subtle "quantum" effects.
E) gas pressure, including air pressure.
B
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The hardest mineral on the Mohs hardness scale is named ______________
Fill in the blank(s) with correct word
A meteoroid, heading straight for Earth, has a speed of 14.8 km/s relative to the center of Earth as it crosses our moon's orbit, a distance of 3.84 × 108 m from the earth's center
What is the meteroid's speed as it hits the earth? You can neglect the effects of the moon, Earth's atmosphere, and any motion of the earth. (G = 6.67 × 10-11 N • m2/kg2, Mearth = 5.97 × 1024 kg) A) 18.5 km/s B) 21.5 km/s C) 32.4 km/s D) 87.3 km/s
The fact that desert sand becomes very hot in the day and very cold at night is evidence that sand has a
A) low specific heat capacity. B) high specific heat capacity. C) none of the above
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.