You stand by the railroad tracks as a train passes by. You hear a 950-Hz frequency when the train approaches, which changes to 820 Hz as it goes away. How fast is the train moving? The speed of sound in air is 340 m/s
a. 14.0 m/s
c. 25.0 m/s
b. 20.0 m/s
d. 37.8 m/s
C
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Two moles of an ideal gas are placed in a container of adjustable volume. When measurements are made
a. the pressure is inversely proportional to the volume at constant temperature. b. the temperature is directly proportional to the volume at constant pressure. c. the temperature is directly proportional to the pressure at constant volume. d. all the statements above are found to be correct. e. only statements (a) and (b) are found to be correct.
A photo sharing website stores the images to your account and enables you to share, print, and edit image files.
Answer the following statement true (T) or false (F)
Spaceman Speff orbits spherical asteroid X with his spaceship. To remain in a circular orbit at 421 km from the asteroid's center, he should maintain a speed of 80 m/s. What is the mass of planet X? (G = 6.67 × 10-11 N • m2/kg2)
A) 4.0 × 1019 kg B) 5.1 × 1017 kg C) 4.0 × 1016 kg D) 5.1 × 1014 kg
Suppose you are inside a smooth-flying [no bumps] jet plane moving at constant speed in a straight line across the Atlantic Ocean. Can you detect this motion [i.e
, can you tell that you are moving] without directly or indirectly making use of anything outside of your own reference frame? If so, how could you detect this; and if not, why not? A) Yes. For example, if you dropped a coin you would find that it lands to the rear of the drop point. B) Yes. For example, if you dropped a coin you would find that it lands to the front of the drop point. C) No, because of the principle of relativity. D) No, because of the principle of the constancy of lightspeed. E) No, because jet planes move far too slowly for such an effect to actually be observed.