Total internal reflection occurs when the angle of incidence of the light is greater than the ______________ angle
Fill in the blank(s) with correct word
critical
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A useful method of expressing very small or very large numbers is
A) scientific notation. B) arabic numerals. C) roman numerals. D) significant figures. E) greek letters.
According to Newton, the greater the distance between gravitationally interacting objects, the
A) less the gravitational force between them. B) more the gravitational force between them. C) constancy of the force between them.
You throw a ball up in the air and hold your hand under it to catch it when it comes down. The reason why the ball stops is because
a. your hand is there: your hand exerts no force on the ball. b. your hand exerts a force on the ball perpendicular to its velocity. c. your hand exerts a force on the ball in the direction of its velocity. d. your hand exerts a force on the ball in the direction opposite to its velocity. e. your hand and the ball exert forces in the same direction on each other.
Which of the following could have been habitable if the Sun had been twice as massive?
A. Mercury B. Neptune C. Venus D. Pluto E. Jupiter's moons