A 60.0 cm long organ pipe is filled with air at 15
and is open at both ends. The velocity of sound in air at 0.000
is 331 m/s. Another 60.0 cm long organ pipe is filled with air at 25.0
and is open at both ends. What is the beat frequency between the second modes of the two organ pipes?
A. 9.20 Hz
B. 9.33 Hz
C. 9.54 Hz
D. 9.75 Hz
E. 9.99 Hz
D. 9.75 Hz
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Ice giants have been discovered orbiting very close to their parent stars. How is this possible?
A. Ice giants may have formed farther from their star, but migrated inward. B. The star may have captured a passing planet. C. The stars are relatively cool, allowing ice giants to form close to them. D. The gravitational force of massive stars can pull icy planetesimals inward from the outer parts of the system. E. All of these choices are correct.
How many Zodiac constellations are there?
A) 28 B) 12 C) 6 D) 365 E) 16
A 1-kg glider and a 2-kg glider both slide toward each other at 1 m/s on an air track. When they collide and stick, the combined-glider speed is
A) 0 m/s. B) 1/2 m/s. C) 1/3 m/s. D) 1/6 m/s. E) 1.5 m/s.
Velma is in a train headed north past Mort at 30 m/s. Velma has a slingshot that can shoot pebbles at 40 m/s. Velma shoots a pebble toward the rear of the train. Velma observes the pebble's velocity to be
A) 10 m/s south. B) 10 m/s north. C) 40 m/s south. D) 70 m/s south. E) 70 m/s north.