The blueness of the sky results from ______________
Fill in the blank(s) with correct word
Rayleigh scattering
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The origin of any microtides in the human body is most likely the
A) Sun. B) Moon. C) Earth.
Hot, low-density gas can be detected in galactic clusters through X-ray emission. The gas is important in understanding dark matter because ____
a. dark matter is responsible for heating the gas b. dark matter must make the cluster massive enough to hold on to the hot gas c. the gas may be the source of dark matter d. the gas is clumped in empty places between galaxies where there is more dark matter e. the gas is produced by dark matter
If a ball at the end of a string is whirled in a vertical circle at constant speed, the tension will be
A. the same throughout the motion. B. greatest at a point where the string is instantaneously parallel to the ground. C. greatest at the lowest point in the motion. D. greatest at the highest point in the motion.
A spaceship leaves Earth and maintains a constant force by means of a nuclear engine. As the speed of the spaceship increases, an observer on Earth finds that relative to her the magnitude of the spaceship's acceleration is
A. 0. B. decreasing. C. constant. D. increasing. E. proportional to the kinetic energy of the spaceship.