Spring tides occur
a. at new Moon and first-quarter Moon.
b. at first quarter and third-quarter Moons.
c. at new Moon and full Moon.
d. at third-quarter and full Moons.
e. at noon and midnight.
c
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Compare the atmospheres of Mars and Venus
A) Both are made of hydrogen and helium, like the jovians. B) Like Earth, nitrogen is the chief atmospheric gas. C) Both are chiefly carbon dioxide, but at Mars it can freeze as dry ice. D) Mars is rich in oxygen, like ours, accounting for its red surface. E) Both are too hot for water to now exist as a liquid at the surface.
Cleavage
What will be an ideal response?
A 12-kg projectile is launched with an initial vertical speed of 20 m/s. It rises to a maximum height of 18 m above the launch point. What is the change in mechanical energy caused by the dissipative (air) resistive force on the projectile during this ascent?
a. ?0.64 kJ b. ?0.40 kJ c. ?0.52 kJ d. ?0.28 kJ e. ?0.76 kJ
The color force between quarks is carried by mesons
Indicate whether the statement is true or false