Why would galaxies colliding in a small cluster tend to stick together, while galaxies in a large cluster tend to pass through each other?
What will be an ideal response?
In a small cluster the lower mass means there is a smaller gravitational force pulling the galaxies together, which results in a lower collision speed. The greater mass in a large cluster results in a higher collision speed—high enough that the individual galaxies don't slow down enough to merge.
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Which portion of the electromagnetic spectrum is used in aircraft navigation?
a. infrared waves b. microwaves c. radio waves d. ultraviolet light
A principle difference between an MHD generator and a conventional generator is that the MHD generator
A) has no moving parts. B) operates more efficiently at high temperatures. C) both of these D) neither of these
When an object is spinning in place, it is experiencing:
a. projectile motion. b. circular motion. c. rotational motion. d. vertical motion. e. orbiting motion.
X-rays are produced using a potential difference of V. The spectrum of wavelengths is found to contain
A. a single wavelength. B. all wavelengths from zero up to a maximum. C. all wavelengths from a minimum to a maximum. D. only discrete wavelengths.