I Am Bored

Loads of viral videos, games, memes, lists and social networking for when you're bored. Updated every day, so visit often.
Latest Popular Most Bookmarked Most Emailed Top Rated My Favorites Random Chat
All Games Funny Entertainment Quizzes Weird Tech Lifestyle, Arts & Lit. News & Politics Science Sports Misc
T-Shirts   Submit Content  

How Much Does A Shadow Weigh?

More than I thought (well less).

submitted by: uatme
< Back Next >
How Much Does A Shadow Weigh?. More than I thought (well less).
+ Add to Favs
Hits: 10256 | Favorites: 4 | Emailed: 0 | Rating: 3.2 | Category: Science | Date: 10/13/2012
 popular today
Do You Even Lift Bro? [Gif] Not fast enough for this guy.
Who Needs Enemies...[Gif] When You Have Friends Like This...2 on the head, one for the bed.
The Hottest Actresses Of The 20th Century [Pix+] Its impossible to measure beauty, but most of you will agree that names listed below deserve to be here.
Starting A New Job [Pic] Dumb ass alert.....
They Didn`t Think This Through Very Well [Pic] Dr Tobias Funke would be proud.
More Comments >

Male, 30-39, Canada
 5753 Posts
Monday, October 15, 2012 8:04:15 AM
So, to answer pumba62's question, yes; if the light was below you, you would weigh less as it would be slightly lifting you up.

This is technically true, light does exert a force, but not at the same speed as the light, rather, with the same momentum as the light. The momentum (p) of a single photon of light is equal its energy divided by the speed of light (E = c p). So how much momentum does a beam of light carry? Well, suppose we shine a 100 Watt spotlight. We are producing 100 Joules of light energy per second. So every second we are giving that light a momentum of (100J)/(300,000,000m/s) = .00000033 kg m/s.

NASA actually has plans for prototypes of a "solar sail" to push space probes out of the solar system using no propulsion other than that provided by reflected sunlight.

Male, 18-29, Europe
 164 Posts
Saturday, October 13, 2012 3:43:22 PM

Male, 18-29, Western US
 555 Posts
Saturday, October 13, 2012 2:41:45 PM
Cool post. Enjoyed it.

Male, 18-29, Eastern US
 2859 Posts
Saturday, October 13, 2012 1:18:38 PM
Yo' mama`s so fat, her shadow weighs 42 pounds!

Male, 40-49, Canada
 4682 Posts
Saturday, October 13, 2012 12:31:38 PM
The light would have to be concentrated, because if it hit you anywhere else, in any other direction, it would apply force there as well, right?"

Partially true. The reflected light would have lost a large amount of its energy, after hitting the surface it reflected off of. Consequently, the energy pushing down would be more than the energy pushing up. So, it would still be pushing you down.

More Comments >

Bored | Suggest a Link | Contact I Am Bored | About I Am Bored | Link to I Am Bored | Live Submission | Privacy | TOS | Ad Choices | Copyright Policy |
© 2015 Demand Media, Inc. All rights reserved.