Sound waves in the interstellar medium
A) cannot exist at all.
B) travel so slowly that they are undetectable.
C) cannot be heard by human ears, but do indeed travel through the gas.
D) travel extremely quickly and are therefore very loud.
C) cannot be heard by human ears, but do indeed travel through the gas.
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Transformers: You need an ideal transformer to reduce a voltage of 150 V in the primary circuit to 25 V in the secondary circuit. The primary circuit has 130 windings and the secondary circuit is completed through a 55-? resistor. How many windings should the secondary circuit contain?
Fill in the blank(s) with the appropriate word(s).
Standing Sound Waves: One of the harmonics of a column of air in a tube that is open at both ends has a frequency of 448 Hz, and the next higher harmonic has a frequency of 576 Hz. What is the fundamental frequency of the air column in this tube?
A. 32 Hz B. 64 Hz C. 88 Hz D. 128 Hz E. 256 Hz
Radiation Activity: A certain substance has a half-life of 5.0 hours. How many nuclei of the substance are required to give an initial activity of 6.0 ?Ci? (1 Ci = 3.7 × 1010 Bq)
A. 5.8 × 109 nuclei B. 8.5 × 108 nuclei C. 6.3 × 108 nuclei D. 3.2 × 109 nuclei E. 2.4 × 109 nuclei
The reaction forces at B (components By and Bz) for the space truss shown below are:
(A) By 5 211.6, Bz 5 23.5 kips
(B) By 5 11.6, Bz 5 223.5 kips
(C) By 5 223.5, Bz 5 11.6 kips
(D) By 5 23.5, Bz 5 211.6 kips
