An organ pipe is open at one end and closed at the other. The frequency of the third mode is 300 Hz higher than the frequency of the second mode. If the speed of sound is 345 m/s, then what is the length of the organ pipe?
A. 50.3 cm
B. 57.5 cm
C. 64.5 cm
D. 66.7 cm
E. 70.5 cm
B. 57.5 cm
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A laser with a power of 1.0 mW has a beam radius of 1.0 mm. What is the peak value of the electric field in that beam? (c = 3.0 × 108 m/s, ?0 = 4? × 10-7 T • m/A, ?0 = 8.85 × 10-12 C2/N • m2)
A) 490 V/m B) 840 V/m C) 65 V/m D) 120 V/m E) 22 V/m
You're in a fast-moving train traveling at constant velocity. If you jump straight up you land
A) slightly ahead of your original position. B) at your original position. C) slightly behind your original position.
A child is standing at the rim of a rotating disk holding a rock, and throws a rock in direction (2) at the instant shown. The disk rotates freely without friction. What happens to the angular speed of the disk?
The battery powering a light bulb is disconnected. As the light bulb's heat dissipates, how will the resistance and current change?
1.The resistance will decrease and the current will increase. 2.The resistance will increase and the current will be zero. 3.The resistance will increase and the current will decrease. 4.The resistance will decrease and the current will be zero.