What is the next harmonic frequency over the fundamental for an organ pipe 1.50 m in length, closed at one end? The speed of sound in air is 340 m/s
a. 227 Hz
c. 113 Hz
b. 170 Hz
d. 56.7 Hz
B
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A girl of mass 55 kg throws a ball of mass 0.80 kg against a wall. The ball strikes the wall horizontally with a speed of and it bounces back with this same speed
The ball is in contact with the wall What is the magnitude of the average force exerted on the wall by the ball? A) 800 N B) 400 N C) 55,000 N D) 27,500 N E) 13,750 N
An astronaut applies a force of 500 N to an asteroid, and it accelerates at 3.00 m/s2 . What is the asteroid's mass?
a. 1500 kg c. 600 kg b. 135 kg d. 167 kg
A 0.200-kg mass attached to the end of a spring causes it to stretch 5.0 cm. If another 0.200-kg mass is added to the spring, the potential energy of the spring will be
A) the same. B) one-half as much. C) twice as much. D) 3 times as much. E) 4 times as much.
In neon, the 20.80-eV level can undergo lasing action to the 17.43-eV level. What is the energy of the resulting photons?
a. 20.80 eV b. 17.43 eV c. 38.23 eV d. 3.370 eV e. 1.685 eV