Naked Science Forum

General Science => General Science => Topic started by: lasmernan on 19/05/2018 10:37:43

Title: Does heat radiation produce force?
Post by: lasmernan on 19/05/2018 10:37:43
Is work done when a wet cloth dries on a line in the sun?
Knowing that Work is said to be done when a force applied on an object causes it to change its position.
Title: Re: Does heat radiation produce force?
Post by: alancalverd on 19/05/2018 10:59:51
Yes.
Energy from the sun breaks the capillary bonds between water and cloth,and gives the water molecules sufficient energy to evaporate. Wind energy then moves them away from the cloth and distributes them in the air. Energy in = work done.
Title: Re: Does heat radiation produce force?
Post by: Bautistaz on 23/05/2018 09:33:06
The main forum of this forum is usually where to find it.
Title: Re: Does heat radiation produce force?
Post by: evan_au on 23/05/2018 10:01:30
Quote from: lasmernan
Does heat radiation produce force?
Yes - but....

The Pioneer spacecraft were tracked with extreme precision over many years as they traveled through the vacuum of the outer Solar System.
- It was seen that they had a slightly different acceleration than you would expect from Newton's law of gravity.
- The cause was tracked down to uneven heat radiation from their electronics box.

But this acceleration was so microscopic (10-9 m/s2) that it would be totally unnoticeable if you were trying to detect it with clothes flapping in a breeze.
See: https://en.wikipedia.org/wiki/Pioneer_anomaly
Title: Re: Does heat radiation produce force?
Post by: Bored chemist on 13/08/2018 19:26:49
Quote from: rami999 on 13/08/2018 19:07:33
Yes sure
Why are you digging up long-dead threads to say little or nothing?