If you balance a broom horizontally on one finger, the center of gravity of the broom will be above your finger, closer to the bristles end than the handle end
If you saw the broom in two pieces at that point and weigh the two parts on a scale, you'll find that the heavier part is the
A) bristles part.
B) handle part.
C) both the same weight
Answer: A
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Which of the following is not one of the three main categories of observation generally used by astronomers?
A) filtering to look at just a single color from an object B) timing to track how an object's brightness varies with time C) spectroscopy to spread an object's light into a spectrum D) imaging to get a picture of an astronomical objects
A conclusion from special relativity is that events that are simultaneous in one inertial frame
A. are simultaneous in all inertial reference frames. B. are simultaneous in all inertial frames moving at the same speed. C. may not be simultaneous in another inertial reference frame. D. are simultaneous in inertial reference frames moving in the same direction. E. are simultaneous in inertial reference frames moving in the opposite direction.
The inflationary theory of the universe may explain why the background radiation is so isotropic
Indicate whether the statement is true or false
We are measuring the spectra of two hydrogen gas clouds. The laboratory frame wavelength of one hydrogen line is 656.2 nm. Cloud A's emission line wavelength is 660.1 nm and Cloud B's emission line wavelength is 670.1 nm
What can we conclude about these clouds? A) They are both approaching us, and Cloud A is approaching faster than Cloud B. B) They are both receding from us, and Cloud B is receding faster than Cloud A. C) They are both approaching us, and Cloud B is approaching faster than Cloud A. D) They are both receding from us, and Cloud A is receding faster than Cloud B.