Why does ice float on water?
a. Ice is hydrophobic and repels water.
b. Water molecules have less mass the colder they get.
c. Water molecules are spaced farther apart in ice than in liquid water.
d. Vibrating electrons in liquid water push ice to the surface.
e. Hydrogen bonds are weaker in ice.
c
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Where did comets that are now in the Oort cloud originally form?
A) near the jovian planets B) outside Neptune's orbit C) inside Jupiter's orbit D) within the solar nebula, but far outside the orbit of Pluto E) all of the above
Why are Uranus's rings darker in color (gray) than Saturn's or Jupiter's?
A. they do not have as much nuclear activity in them, so they do not produce as much light. B. they have a lot of carbon/soot-like material in them. C. there is more sunlight incident on Uranus's rings because of its greater distance from the Sun. D. there is less sunlight incident on Uranus's rings because of its smaller distance from the Sun. E. they are blocking more light from the stars behind them.
Two things that are quantized in the Bohr model of the hydrogen atom are __________ and __________
Fill in the blank(s) with correct word
A car travels in a due northerly direction at a speed of 55 km/h. The traces of rain on the side windows of the car make an angle of 60 degrees with respect to the horizontal. If the rain is falling vertically with respect to the Earth, what is the speed of the rain with respect to the Earth?
A. 48 km/h B. 95 km/h C. 58 km/h D. 32 km/h E. 80 km/h