(10) Use the intensity of sunlight measured on Earth (I = 1400 W/m²) to estimate the (surface) temperature of the Sun. Light takes about 500 s on average to get from the sun to the earth.
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- At 25.0 m below the surface of the sea, where the temperature is 5.00C, a diver exhales an air bubble having a volume of 1.00 cm3. If the surface temperature of the sea is 20.0C, what is the volume of the bubble just before it breaks the surface?The radiation energy (intensity of the radiation) reaching Earth from the sun at the top of the atmosphere is 1.36×10^3??2⁄, which is called the solar constant. Assuming that Earth absorbs the total power coming from the Sun to the Earth and radiates with the emissivity of 0.8 (not ideal black body) at a uniform temperature around the Earth, what would the equilibrium temperature of Earth be?The radiation energy (intensity of the radiation) reaching Earth from the sun at the top of the atmosphere is 1.36×103??2⁄, which is called the solar constant. Assuming that Earth absorbs the total power coming from the Sun to the Earth and radiates with the emissivity of 0.8 at a uniform temperature around the Earth, what would the equilibrium temperature of Earth be?
- The giant star Betelgeuse emits radiant energy at a rate 104 times greater than the Sun, where as its surface temperature is only half (2900 K) that of our Sun. Estimate the radius of the Betelgeuse, assuming e=1 for both stars. The Sun’s radius is rs = 7 x 10^8 m.he rate at which radiant energy from the sun reaches the earth's upper atmosphere is about 1.50kW/m2. the distance from the earth to the sun is 1.50*1011 m, and the radius of the sun is 6.96x108 m. if the sun radiates as an ideal black body (e=1), what is the temperature of its surface?A) Estimate the total solar heating absorbed by the Earth every second. Assume 36% of the incoming solar radiation is reflected by clouds and lost. You can assume that the Earth intercepts sunlight with an effective area of πr2 where r is Earth’s radius. B) Estimate the total heat lost by the Earth as infrared radiation every second. Assume Earth has an effective temperature of 252 K (-21 C).
- The amount of heat per second conducted from the blood capillaries beneath the skin to the surface is 230 J/s. The energy is transferred a distance of 1.8 × 10-3 m through a body whose surface area is 1.7 m2. Assuming that the thermal conductivity is that of body fat, determine the temperature difference between the capillaries and the surface of the skin.The temperature of a kitchen oven may be 410 °F.. Suppose a small circular hole, with diameter d = 1 cm, is opened in the oven wall. Determine the power radiated from the hole. celsius = 5/9 (fahrenheit - 32); kelvin = 273 + celsius; (in W) OA: 0.177 OB: 0.207 OC: 0.242 D: 0.284 E: 0.332 F: 0.388 G: 0.454 H: 0.531The outer surface of a spacecraft in space has an emissivity of 0.8 and a solar absorptivity of 0.3. If solar radiation is incident on the spacecraft at a rate of 950 W/m?, determine the surface temperature of the spacecraft, when the radiation emitted equals the solar energy absorbed.
- A person of surface area 1.80 m2 is lying in the sunlight to get a tan. If the intensity of the incident sunlight is 7.90 × 102 W/m2, at what rate must heat be lost by the person in order to maintain a constant body temperature? (Assume the effective area of skin exposed to the Sun is 42.0% of the total surface area, 57.0% of the incident radiation is absorbed, and that internal metabolic processes contribute another 90.0 W for an inactive person.)Heat from the Sun is incident on a leaf that is horizontal to the radiation. The power per unit area from the Sun is 8.75 102 W/m2. Assume that 75.0% of this energy goes into heating the leaf. The specific heat capacity of the leaf is 3.7 kJ/(kg °C, its mass is 0.300 g, and surface area is 8.00 x 10-3 m2. (a) Calculate the power that goes into heating the leaf. W (b) Calculate the rate of the rise in the temperature of the leaf. (Hint: Q = mc?T) °C/sThe surface of the Sun has a temperature of 5500 °C. Treating the Sun as a perfect blackbody, with an emissivity of 1.0, find the power that it radiates into space. The radius of the Sun is 7.0 × 108m, and the temperature of space can be taken to be 3.0 K.