Currently in the USA, SETI programs are mostly funded
A) privately
B) by the US Government
C) by the United Nations
D) by the National Academy of Sciences
A
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In the Ptolemaic model, Mercury and Venus had to be treated differently from the rest of the planets: Their epicycles had to remain centered on the Earth-Sun line
Indicate whether the statement is true or false
An airplane flies 120 km at a constant altitude in a direction 30.0° north of east. A wind is blowing that results in a net horizontal force on the plane due to the air of 2.40 kN in a direction 10.0° south of west
How much work is done on the plane by the air? A) -2.71 × 108 J B) -0.985 × 108 J C) -221 × 108 J D) 221 × 108 J E) 0.821 × 108 J
A glass tea kettle containing 500 g of water is on top of the stove. The portion of the tea kettle that is in contact with the heating element has an area of 0.090 m2 and is 1.5 mm thick
At a certain moment, the temperature of the water is 75°C, and it is rising at the rate of 3 C° per minute. What is the temperature of the outside surface of the bottom of the tea kettle? The thermal conductivity of glass is 0.840 W/(m•K). Neglect the heat capacity of the kettle. A) 39°C B) 92°C C) 120°C D) 86°C E) 77°C
What is the frequency of monochromatic light where the photon energy is 6.5 × 10^-19 J? (h = 6.63 × 10^-34 J×s)
a. 2.2 × 10^14 Hz c. 4.4 × 10^14 Hz b. 9.8 × 10^14 Hz d. 8.3 × 10^14 Hz