Four different uses of lasers are __________, __________, __________, and __________,
Fill in the blank(s) with correct word
to produce holograms, for surgery, to measure accurately distances between objects, in DVD and compact disc players, to cut metals, to induce nuclear fusion reactions, to transmit telephone information along optical fibers, in checkout counter price scanners.
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Suppose unlike Chelyabinsk, the next major asteroid impact we experience is more devastating. Why might this be?
A) The asteroid is larger in size. B) It has a more vertical trajectory, and is therefore less likely to break up in the atmosphere due to friction. C) It hit water, which will cause a world-wide tsunami. D) Both A and B
Which of the following characterizes the net force on a particle falling through a fluid at its terminal speed?
a. It is at a maximum. c. It is downwards. b. It is upwards. d. It is zero.
Which jovian planets in our solar system have rings?
A) Saturn only B) Jupiter and Saturn only C) all but Neptune D) all four of the jovian planets have rings.
When you plot the position of sun-like stars, you will find that ___
a. almost all sun-like stars are found in spiral arms b. sun-like stars are found in and out of spiral arms c. sun-like stars are left behind by the spiral arms that created them d. sun-like stars are only found in the outer 2/3 of the disk e. sun-like stars are only found in the inner 2/3 of the disk