A ball is projected upward at time t = 0 s, from a point on a flat roof 90 m above the ground. The ball rises and then falls with insignificant air resistance, missing the roof, and strikes the ground. The initial velocity of the ball is 80.5 m/s
Consider all quantities as positive in the upward direction. The vertical velocity of the ball when it is above the ground is closest to A) -81 m/s.
B) -64 m/s.
C) -48 m/s.
D) -32 m/s.
E) -97 m/s.
A
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For most of history, the lack of observable stellar parallax was interpreted to mean that
A) stars must all lie at the same distance from Earth, on the celestial sphere. B) stars were too far away for parallax to be measured with available technology. C) Earth is stationary at the center of the universe. D) Galileo's theories of the universe were essentially correct.
Make a drawing illustrating the positions of the Sun, the Moon, and Earth during a total solar eclipse. Show the shadows of both the Moon and Earth. (It is not necessary to make the drawing to scale.)
Optical telescopes are intended for the study of _______________ light
Fill in the blank(s) with correct word
When the relative humidity is 100%, the air temperature is equal to
a. the lapse rate. b. 100°F. c. the dew point temperature. d. none of these.