The temperature is such that the rms speed of nitrogen molecules is 900. m/s at 750. mm Hg pressure
If the pressure increases to 780. mm Hg while the temperature remains constant, what is the rms speed now? [Molecular weight of nitrogen molecule is 28.]
same -- 900. m/s since depends only on temperature
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In the x-ray chemical analysis of the stainless-steel specimen in Figure 15.11, the Cr K? line with a wavelength of 0.2291 nm occurs at 99 degrees. What is the interplanar spacing of the crystal used in this wavelength dispersion experiment?
What will be an ideal response?
Pluto is no longer classified as a planet; instead it is classified as a(n) ____________________
Fill in the blank(s) with correct word
You observe a galaxy that is 100 million light-years away. Which of the following do you see?
A) The light from the galaxy as it is today, and it is blueshifted. B) The light from the galaxy as it is today, and it is redshifted. C) The light from the galaxy as it was 100 million years ago, and it is blueshifted. D) The light from the galaxy as it was 100 million years ago, and it is redshifted. E) Nothing: the galaxy lies beyond the cosmological horizon.
Vector A has a magnitude of 3.0 units and makes an angle of -90.0
with the positive x-axis. Vector B has a magnitude of 4.0 units and makes an angle of -120
with the positive x-axis. What is the magnitude of the vector sum of A + B?
A. 1.0 units B. 6.8 units C. 4.0 units D. -6.8 units