A person with an initial mass of 70 kg climbs a stairway and thereby rises 6.0 m in elevation
By how much does his mass increase by virtue of his increased potential energy? (c = 3.0 × 108 m/s)
4.6 × 10-14 kg
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Saturn is the largest and most massive of the Jovian planets
a. True b. False Indicate whether the statement is true or false
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.
At which lunar phase(s) are tides most pronounced (e.g., the highest high tides)?
A) first quarter B) new Moon C) full Moon D) both new and full Moons E) both first and third quarters
Which of these undergoes circular motion?
a. A bullet shot from a gun. b. A top spinning on a table. c. A baseball hit by a bat. d. A satellite orbiting the Earth. e. An apple falling out of a tree.