How does a rocket launch upwards? Choose the statement that best describes why a rocket goes up
A) By expelling gas downwards, the rocket is propelled upwards.
B) By expelling gas, the rocket loses mass; because it is lighter, it rises up.
C) By expelling gas downwards, which pushes against the ground, the rocket is propelled upwards.
A
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Significant Figures: What is the sum of 2.67 + 1.976 + 2.1 expressed to the correct number of significant figures?
A. 6.7 B. 6.75 C. 6.746 D. 6.7460
The mass of a cubic meter of water is
A) 1 kg. B) 10 kg. C) 100 kg. D) 1000 kg. E) 9800 N.
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
Lower temperatures can be expected
A) behind a stationary warm front. B) behind an advancing warm front. C) ahead of an advancing cold front. D) behind an advancing cold front.