(Part A) Consider a blackbody that radiates with an intensity I2 at a room temperature of 300K. At what intensity will this blackbody radiate when it is at a temperature of 400K? (Part B) At what wavelength (lamda m) would the intensity of blackbody radiation be at a maximum when the blackbody is at 2900K?
(Part C) An astronomer is trying to estimate the surface temperature of a star with a radius of 5.0x10^8 by modeling it as an ideal blackbody. The astronomer has measured the intensity of radiation due to the star at a distance of 2.5x10^13 and found it to be equal to 0.055 W/m^2. Given this information, what is the temperature of the surface of the star? Express answer in K.

If forces acting on an object are unbalanced, which factors may result fron an unbalanced force? check all that apply

There is a theory that indicates that dinosaurs became extinct when about 65 million years ago, a large asteroid hit the earth surface. dust caused by this collision blocked the sunlight reaching the earth's surface and many forms of life became extinct due to the cold. fearing this threat, how large the radius of an asteroid should you be looking for if the dangerous asteroid size is approximately the same as the one that killed the dinosaurs? available data suggests that about 18% of that asteroid's mass ended up as a dust spread evenly over earth after eventually settling out of the upper atmosphere. about 0.0180 g/cm^2 of dust, which is chemically different than the earth's rock, covered the earth's surface. typical asteroids have a density of about 1.9 g/cm^3. now that we know the size of the asteroid, how much energy was released during impact, assuming all of it was just the kinetic energy of the asteroid right before the impact?

On a day when the barometer reads 75.23 cm, a reaction vessel holds 250 ml of ideal gas at 20 celsius. an oil manometer ( ρ= 810 kg/m^3) reads the pressure in the vessel to be 41 cm of oil and below atmospheric pressure. what volume will the gas occupy under s.t.p.?