The most widely used ceramic is silica in the form of _________.
Fill in the blank(s) with the appropriate word(s).
glass
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A ball is thrown straight up. It reaches its highest point and then falls back. Which of the following is the correct statement?
A. Throughout its motion, the ball's acceleration is zero B. At the highest point in its motion, the ball's acceleration is zero C. At the highest point in its motion, the ball's velocity and acceleration are zero D. At the highest point in its motion, the ball's velocity is zero E. Throughout its motion, the ball's velocity is zero
A 500-eV electron and a 300-eV electron trapped in a uniform magnetic field move in circular paths in a plane perpendicular to the magnetic field. What is the ratio of the radii of their orbits?
a. 2.8 b. 1.7 c. 1.3 d. 4.0 e. 1.0
Two stars of the same spectral class must have the same
a. radius. b. temperature. c. mass. d. distance. e. all of the other choices.
There are no aurora on Venus because it
A) lacks atmospheric oxygen. B) is too hot. C) lacks a strong magnetic field. D) lacks an ionosphere. E) lacks strong winds.