what is the total power P radiated by the sun given the inensity of sunlight at the earth if I, the earth sun distance is R and the radius of the earth is r. Do not include any other values besides those listed
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- Estimate the angle made by rays radiation with the normal to a PV cell on 1 Dec at 9:00 am solar time for a location at 28° N and the PV is tiled at angle of lilted at latitude plus 10° with the horizontal and is pointing being to south.Thermal emission from forehead. Noncontact thermom- eters are used to quickly measure the temperature of a person, to monitor for fever from an infection. They measure the power of the radiation from a surface, usually the forehead, in the infrared range, which is just outside the visible light range. Skin has an emissivity & = 0.97. What is the total power (infrared and vis- ible) of the radiation per unit area when the temperature is (a) 97.0°F (a common early morning temper- ature), (b) 99.0°F (a common late afternoon temperature), and (c) 103°F (a temperature indicating infection)? ww 36.8Answer the following by filling the blank: During a bout with the flu, an 80-kg person ran a fever of 39 oC. Consider that the specific heat of any human body is 3470 J/kg K, how much energy does the body need to burn to reach the fever temperature? The answer (in fundamental SI unit) is ___________ (type the numeric value only, dont use scientific notation)
- Weight of the ozone layer 1.0p 1 Incredibly, the ozone layer in the upper atmosphere that protects us from the ultraviolet rays of the Sun varies somewhat but, on the average, would be less than one centimeter thick if it were brought down to sea level. Given that the density of ozone at sea level would be about 2.0 grams per litre, what is the total amount of ozone (in Tonnes) in the upper atmosphere when its sea-level thickness is 0.22 cm? Take the radius of the Earth to be 6400 km. (The volume of a thin skin around an object is the surface area of the object times the skin thickness.) Give your answer in gigatonnes, and do not specify units in the answer box. Answer Show feedback Updated just now 4The power radiated by the Sun is 3.83 × 1026 W (The Watt is the SI unit of power, 1 W = 1 J s-1). Given that the power radiated by the Sun is the rate at which energy is radiated by the Sun per unit time, write down a formula relating the total energy radiated by the Sun, E, during a time interval T, and the radiated power, P. Use your formula and the information given above to calculate the total energy radiated by the Sun in exactly 4 hours. Give your answer to 3 significant figures and write it using scientific notation.During a bout with the flu an 80-kg person ran a fever of 39 oC. Consider that the specific heat of any human body is 3470 J/kg K, how much energy does the body need to burn to reach the fever temperature? The answer (in fundamental SI unit) is ___________ (type the numeric value only, dont use scientific notation)
- The total rate at which power is used by humans worldwideis approximately 15 TW (terawatts). The solar flux averagedover the sunlit half of Earth is 680 W>m2 (assumingno clouds). The area of Earth’s disc as seen from the Sun is1.28 * 1014 m2. The surface area of Earth is approximately197,000,000 square miles. How much of Earth’s surfacewould we need to cover with solar energy collectors to powerthe planet for use by all humans? Assume that the solar energycollectors can convert only 10% of the available sunlightinto useful power.When going lrom fat toO muscie tiSSUC, 3. (a) Find energy that the light-skinned person (e = 0.6) with a skin area of A =1.7m2 receives from solar radiation incident at angle 0 = 60°. (b) Find energy that the dark-skinned person (e = 0.8) with a skin area of A =1.7m2 receives from solar radiation incident at angle 0 = 60 %3D %3D %3DWhat is the root mean square velocity, vrms, for Helium atom (He) at 66oC? Hint: How many amu does an He atom contain? 1 amu = 1.67 x 10-27 kg Boltzman's Constant, k = 1.38 x 10-23 J/K Give your answer in m/s to 4 significant figures (NO DECIMALS)
- Example (1-2): Calculate the conductivity of Germanium (Ge) when one donor atom is added to 10 million pure Germanium atoms. From Germanium atomic density per one cubic meter is 4.4 x10*, as one atom of donor atom is added to 10' Germanium atom.a) An incandescent light bulb with a surface area of 0.0136 m2 and an emissivity of 0.94 has a surface temperature of 176°C. What is the rate of thermal radiation emitted from the bulb [round your final answer to one decimal place]? b) If the surface of the light bulb in the question above acted like a black body radiator, it would emit less thermal radiation than what was calculated above: TRUE or FALSE?Some amount of heat energy is removed from a 9cm X 26cm X 46cm block of ice to cool from 0ºC to -26ºC. (Hint: to find mass, use the relation between, density, mass and volume) Calculate the following: a) The mas of ice cube in grams (density of ice = 920 kg/m3). b) The temperature difference in kelvin b) The energy removed from ice in calories . (specific heat of ice = 2093 J/kgºC)