Humans
A) and primates evolved from a common ancestor
B) and primates evolved directly from dinosaurs
C) and primates evolved directly from birds
D) evolved directly from modern primates
A
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In order to turn a star's proper motion into its space velocity, we must also know:
A) its mass and spectral type. B) its temperature and age. C) its distance and radial velocity. D) its distance and mass. E) its spectral type and period of rotation.
Your friend left your house and is now driving 40 miles per hour, but she has been speeding up the whole time since she left your house, and has gone 10 miles. How long has she been driving?
A) shorter than 15 minutes B) longer than 15 minutes C) 15 minutes
At liftoff, the engines of the Saturn V rocket consumed 12 500 kg/s of fuel and exhausted the combustion products at 2 700 m/s. What was the total upward force (thrust) provided by the engines?
a. 3.38E+7 N b. 4.63E+6 N c. 2.16E+5 N d. 3.48E+7 N e. 3.28E+7 N
A pair of parallel plates, forming a capacitor, are charged. The plates are pulled apart to triple the original separation, the charges on the plates remaining the same. What is the ratio of the final energy stored to the original energy stored?
a. 1/9 c. 1/3 b. 1.5 d. 3