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
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Why couldn't electrons bind to nuclei when the nuclei first formed?
A) electrons exert the strong force on the nuclei and repel it B) universe was much too hot C) universe was much too cold D) electrons exert the weak force on the nuclei and repel it E) electrons have negative charge and repel the nuclei
The "no atmosphere" temperature of a planet is never higher than the planet's actual temperature
Indicate whether the statement is true or false
A conducting bar of length L rotates with a constant angular speed of +2.0 rad/s about a pivot P at one end, as shown. A uniform magnetic field (magnitude = 0.20 T) is directed into the paper. If L = 0.40 m, what is the potential difference, VA?VP?
A. ?12 mV B. +8.0 mV C. ?8.0 mV D. +12 mV E. ?16 mV
A pair of 1-ohm resistors connected in series is 2 ohms, and when connected in parallel is
A) 1/2 ohm. B) 1 ohm. C) also 2 ohms. D) none of the above