The formula proposed for determining the number of technological civilizations in the Milky Way Galaxy with which we might communicate, is known as the _______________
Fill in the blank(s) with correct word
Drake equation
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An automobile is moving on a highway at 100 km/hr. Estimate the heat loss per unit area from the auto’s roof, which is at 30ºC, if the air temperature is 15ºC.
What will be an ideal response?
An observer's nadir is
a. the point directly opposite the observer's zenith. b. the north point on the observer's horizon. c. located at the center of Earth. d. always located near a circumpolar constellation. e. directly opposite the north celestial pole.
Briefly explain why Earth feels a greater tidal force from the Moon than from the Sun, even though it feels a greater gravitational force from the Sun
What will be an ideal response?
A 500-N weight sits on the small piston of a hydraulic machine. The small piston has an area of 2.0 cm2. If the large piston has an area of 40 cm2, how much weight can the large piston support? Assume the pistons each have negligible weight
A) 25 N B) 500 N C) 10000 N D) 40000 N