A 30.0 cm long organ pipe is filled with air and is open at one end and closed at the other. The velocity of sound in air at 0
is 331 m/s. What is the wavelength of the fifth mode?
A. 30.3 cm
B. 26.7 cm
C. 21.2 cm
D. 17.1 cm
E. 12.3 cm
D. 17.1 cm
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A circular steel rod 0.005 m in radius and 4.000 m long is subject to an axial force of 0.250 × 105 newtons. We observe that the rod elongates 0.616 × 10-2 m. Calculate the tensile stress and the axial strain in the rod.
What will be an ideal response?
This series of images shows the pulsar at the center of the Crab Nebula looking bright every 0.033 second. Based on these data and current theory of pulsars, what can we conclude?
A) The pulsar is a neutron star that makes one full rotation every 0.033 second. B) The pulsar is a neutron star whose magnetic field switches on and off every 0.033 second. C) The pulsar is part of a close binary star system in which the two stars complete an orbit every 0.033 second. D) The pulsar has an accretion disk that undergoes an x-ray burst every 0.033 second.
The inhabitants of a planet in another galaxy have their eyes at the exact center of their 4.0-m-long bodies. How long must a plane mirror be for such a creature to be able to see all of its body in the mirror?
A. 1.0 m B. 2.0 m C. 2.5 m D. 4.0 m E. 8.0 m
When the midpoint of the face of the Sun appears to be on the horizon, where is the actual midpoint from the point of view of the observer?
a. above the horizon at sunrise and below the horizon at sunset b. on the horizon c. below the horizon d. above the horizon