Calculate the amount of radiation emitted for a unit surface (1 m2) for a hot sidewalk in Birmingham at 53°C and £ ≈ 0.82. Express your answer SI units (in W).

Air at 21°C  is blown over a hot pipe with a surface area of 3.61 m2 to dissipate 922 W of heat energy.  What is the minimum convection heat transfer coefficient that will ensure that the temperature of the pipe surface is less than 45°C [round your final answer to two decimal places]?

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

A hot drink is taken outside on a cold winter day when the air temperature is –6°C. According to a principle of physics called Newton's Law of Cooling, the temperature T (in degrees Celsius) of the drink t minutes after being taken outside is given by T(t) = -6 + Ae-kt. %3D where A and k are constants. (a) Suppose that the temperature of the drink is 86°C when it is taken outside. Find the value of the constant A. (b) In addition, suppose that 20 minutes later the drink is 30°C. Find the value of the constant k. (c) What will the temperature be after 32 minutes?