The total surface area of the human body is 1.20 m2 and the surface temperature is 30∘c=303∘k. if the surroundings are at a temperature of 4.0 ∘c , what is the net rate of heat loss from the body by radiation? the emissivity of the body is very close to unity, irrespective of skin pigmentation. express your answer using two significant figures.

To solve this problem we must consider the expressions of Stefan Boltzmann's law for which the rate of change of the radiation of energy H from a surface must be

Where

A = Surface area

e = Emissivity that characterizes the emitting properties of the surface

= Universal constant called the Stefan-Boltzmann constant

T = Absolute temperature

The total heat loss would be then

Therefore the net rate of heat loss from the body by radiation is 155.29J

the box does not move because you need to use a force greater than 300 n. you are only using 50 n. it needs to at least be 301 n for the box to move because then it is an unbalanced force and it will move the way that the greater force is pushing it. if you use only 300 n it will be a balanced force and will not move because the force you are exerting on the   box is the same as its force.

hope this !

im sorry if i went too in depth, i am going to include a link to a video on khan academy that will explain this.   hope that you like the video and that it explains more in detail to you.

that is the link.

because if the tool that you are using is not balanced it there would be false mass.