If a floating log is seen to bob up and down 15. times in a minute as waves pass by you, what is the frequency and period of the wave?
What will be an ideal response?
0.25 Hz frequency, 4.0 second period
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Which statement best describes the surface of Io?
a. dark and dirty ice, heavily pocked with craters b. old and dark on some portion, but cratered with a young bright grooved terrain c. icy crust free of craters with a liquid water ocean beneath d. covered in active sulfur-based volcanoes e. mostly water ice mixed with methane
The type of radiation coming from active nuclei due to electrons spiraling in very strong magnetic fields at relativistic speeds is:
A) positron radiation. B) thermal energy. C) a blackbody curve. D) synchrotron radiation. E) nuclear energy.
If the interplanar spacing of NaCl is 2.814 × 10?10 m, what is the predicted angle at which X-rays of wavelength 0.140 nm will be diffracted in a first-order maximum?
A. 31.3° B. 7.20° C. 20.5° D. 14.4° E. 29.8°
Refer to Figure 6-11. Block A has a mass of 2.00 kg and rests on a rough table and is connected to block B, which has a mass of 3.00 kg, after passing over an ideal pulley, as shown. Block B is released from rest. The coefficient of kinetic friction between block A and the table is 0.300. What is the acceleration of the masses?
A. 6.54 m/s2 B. 3.92 m/s2 C. 4.71 m/s2 D. 0.981 m/s2 E. 5.89 m/s2