The 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/m2, determine the surface temperature of the spacecraft when the radiation emitted equals the solar energy absorbed.

An aluminium object with a mass of 4.97 kg and at a temperature of 26.8 °C comes to thermal contact with a 9.98 kg copper object which is initially at a temperature of 85.3 °C. What is going to be the equilibrum temperature of the two objects? Neglect heat transfer between the objects and the environment. The specific heats are: CAI = 900 J/kg°C and ccu = 387 J/kg°C.

The next four questions use this description. Our Sun has a peak emission wavelength of about 500 nm and a radius of about 700,000 km. Your dark-adapted eye has a pupil diameter of about 7 mm and can detect light intensity down to about 1.5 x 10-11 W/m². Assume the emissivity of the Sun is equal to 1. First, given these numbers, what is the surface temperature of the Sun in Kelvin to 3 significant digits? 5,796

While swimming, conduction can play a big role in heat loss from the body. The body of one swimmer has a total surface area of 1.80 m2 and an average thickness of 1.60 mm. The skin's thermal conductivity is 0.370 W/m-K. If the water's temperature is 20.0°C, and the blood reaching the inner surface of the skin is at 37.0°C, what is the rate of energy loss for that person through conduction?

What is the rate of heat transfer by radiation from the skin of a person standing in a dark room whose ambient temperature is 22 °C ? The person has a normal skin temperature of 33 °C and a surface area of 1.50 m².The emissivity of skin is 0.97 in the infrared, the part of the spectrum where the radiation takes place.

An aluminum bar has a cross-section that is 5.1 cm by 6.93 cm and is 1.91 m long. Aluminum has a thermal conductivity of 205 W/m K. If the aluminum bar is used to bridge between ice at 0 °C and boiling water at 100 °C, what is the rate of heat transfer (in W) along the bar?

The sun has a temperature of 6000 K and a radius of 6.07 x 10^18 m^2. What is the heat current if it has an emissivity of 1. The Stefan-Boltzmann constant is 5.67 x 10^-8 W/m?K4 8.89 x 10^26 W O 2.76 x 10^25 w O 1.98 x 10^7 W O 4.46 x 10^26 w

A 19 century lab technician is testing possible metals for bulb filaments. A tantalum filament with a surface area of 0.370 mm and an emissivity of 0.976 radiates 0.80 W of light. Determine the filament's temperature (in K). The melting point for tantalum is 3269 K.

An electric stove burner has surface area 325 cm² and emissivity e = 1. The burner consumes 1500 W and is at 900 K. If room temperature is 300 K, what fraction of the burner's heat loss is from radiation?

An incandescent light bulb has a tungsten filament that is heated to a temperature of 3.20 × 103 K when an electric current passes through it. If the surface area of the filament is approximately 1.00 × 10−4 m2 and it has an emissivity of 0.360, what is the power radiated by the bulb?The Stefan–Boltzmann constant (σ) is 5.670 × 10−8 W/(m2·K4).