The principal greenhouse gases are ______________ and ______________
Fill in the blank(s) with correct word
water; carbon dioxide
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Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degrees frictionless incline. The vertically hanging mass is 4.0 kg and the mass on the incline is 6.00 kg. The acceleration of the 4.00 kg mass is
A. 0.980 
B. 3.92
C. 5.75
D. 6.86
E. 7.84
Leptons can interact by which of the following forces?
A) strong nuclear force, weak nuclear force, electromagnetic force, gravitation B) strong nuclear force, weak nuclear force, electromagnetic force C) weak nuclear force, electromagnetic force, gravitation D) strong nuclear force, weak nuclear force E) strong nuclear force, electromagnetic force, gravitation
What would be the best explanation for the fact that most natural water has a pH of about 5.6?
A) Carbon dioxide reacts with water to form an acid. B) Air contains acid rain particles. C) Minerals that are dissolved in water are often acidic. D) Many salts that dissolve in natural waters make the water basic. E) none of the above
All the planets, asteroids, comets, and most of the moons in the Solar System formed at about the same time.
Answer the following statement true (T) or false (F)