To maintain a constant temperature, the Earth must radiate as much light energy every second as it absorbs from the Sun. The Earth receives about 1.74 x 1017 W from the Sun, and absorbs about 70% of the incoming light, reflecting 30% of it back into space. That 70% is the light energy that must be re-radiated by the Earth. The Earth's total surface area is about 5.10 x 1014 m2. If the Earth radiates as a uniform, perfect blackbody, what must its temperature be in order to radiate as much light energy every second as it receives from the Sun

If a textbook weighs 37.2 n on venus, and the book has a mass of 4.4 kg, what is the strength of gravity on venus? 8.9 m/s28.9 m/si don't have enough information,9.8 m/s2

Place several e-field sensors at a few points on different equipotential lines, and look at the relationship between the electric field and the equipotential lines. which statement is true? 1-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of higher voltages. 2-at any point, the electric field is perpendicular to the equipotential line at that point, and it is directed toward lines of lower voltages. 3-at any point, the electric field is parallel to the equipotential line at that point.

Students in an introductory physics lab are performing an experiment with a parallel-plate capacitor made of two circular aluminum plates, each 11 cm in diameter, separated by 1.0 cm. how much charge can be added to each of the plates before a spark jumps between the two plates? for such flat electrodes, assume that value of 3×106n/c of the field causes a spark.