The three lowest resonate frequencies of a system are 50 Hz, 150 Hz, and 250 Hz. The system could be
A. a tube of air closed at both ends.
B. a tube of air open at one end.
C. a tube of air open at both ends.
D. a vibrating string with fixed ends.
B. a tube of air open at one end.
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As more resistors are added in parallel to a constant voltage source, the power supplied by the source
A) increases. B) decreases. C) does not change. D) increases for a time and then starts to decrease.
Suppose the gravitational potential energy for a mass at an altitude of one Earth radius is PE1 and at two Earth radii is PE2 . How do the absolute values of these potential energies compare?
a. |PE1| = 2|PE2| b. |PE1| = 4|PE2| c. |PE1| < 2|PE2| d. |PE1| > 2|PE2| but is not equal to 4|PE2|
Imagine we've discovered a planet orbiting another star at 1 AU every 6 months. The planet has a moon that orbits the planet at the same distance as our Moon, but it takes 2 months. What can we infer about this planet?
A) It is more massive than Earth. B) It is less massive than Earth. C) It has the same mass as Earth. D) We cannot answer the question without knowing the mass of the star. E) We cannot answer the question without knowing the mass of the moon.
A 10.0-kg shell is traveling horizontally to the right at 25.0 m/s relative to the ground when it explodes into two fragments, one of mass 3.00 kg and the other of mass 7.00 kg
The lighter fragment goes directly forward, and the explosion releases 1.50 × 103 J of mechanical energy to the fragments. Find the magnitude and direction of the velocity of the heavier fragment relative to the ground just after the explosion. Ignore the effect of any ejected gases.