A 2.31-kg rope is stretched between supports that are 10.4 m apart, and has a tension in it of 49.2 N. If one end of the rope is slightly tweaked, how long will it take for the resulting disturbance to reach the other end?
A) 0.720 s B) 0.699 s C) 0.615 s D) 0.664 s
B
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The root-mean-square speed (thermal speed) of the molecules of a gas is 200 m/s at 23.0°C. At 227°C the root-mean-square speed (thermal speed) of the molecules will be closest to
A) 260 m/s B) 630 m/s C) 330 m/s D) 160 m/s E) 2000 m/s
In a Newtonian fluid, the applied shear stress divided by the viscosity is equal to the plastic shear strain rate raised to the power of _________.
What will be an ideal response?
The spectra of most galaxies show redshifts. This means that their spectral lines
A) have wavelengths that are longer than normal. B) always are in the red part of the visible spectrum. C) have wavelengths that are shorter than normal. D) have a higher intensity in the red part of the spectrum.
When we see them in the night sky, which of the following objects are emitting their own light?
A. Mars B. the Sun C. the Moon D. Venus E. All of these choices are correct.