You are in a desert and you are thirsty. You come upon a deep well hole and you see water about 11 meters down. You take a long tube and you try to drink the water by sucking on the tube. Compared to drinking with a cup with a standard 20 cm straw, in this case, drinking would be
1.much easier.
2.about the same level of difficulty.
3.more difficult.
4.impossible.
4
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The diameter of the sun is 1.39*109 m. Estimate the percentage of the total radiation emitted by the sun, which approximates a blackbody at 5760 K, that is actually intercepted by the Earth. Of the total radiation falling on the Earth, about 70% falls on the ocean. Estimate the amount of radiation from the sun that falls on land, and then estimate the ratio of energy currently used worldwide and the amount of terrestrial solar energy that is available. Discuss why all of the energy cannot be harnessed.
GIVEN • Diameter of sun (Ds)= 1.39*109 m • Sun is approximate black body at temperature (Ts) =5760 K • 70% of radiation falls on the ocean. • Diameter of the earth (De)= 1.27*107 m • Distance between sun and earth (Rse )=1.53*1011 m FIND • Amount of radiation from sun that falls on land • Ratio of energy currently used worldwide and the amount of terrestrial solar energy that is available. • Discuss why all energy cannot be harnessed. ASSUMPTIONS • The sun’s radiation is assumed as ideal black body radiation.
Neutron stars do NOT have:
A) masses greater than 1.4 solar masses. B) sizes comparable to large cities. C) strong magnetic fields. D) large surface gravities, compared to the Sun. E) rotation periods comparable to the Sun's.
What are comets made of?
A) silicates and rocky dust B) metallic dust particles C) dark colored complex hydrocarbons D) methane, ammonia, and water ice E) All of the above.
Humans’ use of rocks and minerals as building materials is an example of which interaction?