Recent content by Vanity

Hi, I'm having troubles finding a solution for a problem. Can anybody help me out ? I have no idea where to start so any informations is greatly appreciated. Here's the problem: A bat uses sonar at 50kHz to detect objects. The bat is flying in air at 30 degrees Celcius. Directly in front...

The problem actually include the temperature, so I guess I need to include it in my formula. I google'd for it but could only find tables. If density of water is 1, what formula should I use ? Thanks !

Great ! Thanks. One last question, does the temperature affects anything ? Thanks !

Hi, I need to solve this problem but I have no idea where to start. I made a little drawing with all the informations I have but now I'm stuck. Here's the problem: A submarine uses sonar waves, to identify other ships, by directing a highly directional acoustic pulse at a target, and...

Hey Everyone :) I'm trying to find out the year on which ~stocks cells~ has been discovered? I'm really not sure about the english word... but in french we call them "cellules souches". I've search a bit on google but couldn't find anything. Edit: Okay I found the correct english word...

Okay, let's see. The object only moves horizontally, so if I add all the forces on Y, it should be 0. So gravitationnal force + normal force (Y) should = 0. Fg = 0,558 kg * 9,8 = 5,47 N + 5,47Sin(85) = 0 so, N = -5,47Sin(85) That means the total forces on the object is equal to...

Okay, image has been aproved now.. (sorry for the double post).. Anybody can help me out from here? Thanks! :)

Yes, I've join a picture of what it looks like (see attachments). That's what I'm looking for :(

the surface is not flat, sorry i forgot to mention that. It's on 5 degrees ~slope~, and it's "slipping" on it. The question says to ignore the friction, so no other forces beside the normal and gravitationnal one... ;)

Hi! I'm doing my physics lab and I need to find the normal strenght applied on an object. Here's the info I have: weight: 0,558 kg gravitational strenght: 0,558 * 9,8 = 5,47 N Anybody can help me out? Thanks! :smile: - Alex

Allright, I got it. Thanks a lot ;)

the length is smaller between each points, here's what it looks like: Between Points... [1-2] 7,0 cm [2-3] 6,2 cm [3-4] 5,9 cm [4-5] 5,0 cm [5-6] 3,9 cm [6-7] 3,3 cm [7-8] 2,3 cm There we go ;) sorry I didn't mention this in the first post

Anyone from Québec, Canada? I'd also would like to know what's the equivalent of K-12 here.. ;)

Hi all! I'd like to know fi anybody can help me out with this, I just need some info so I can do it by myself.. formulas or something. I have a disk (looks like a hockey puck) sliding on an air table which is elevated with an angle of 5°. [weight of the disk: 0,558g] Every 0,1s, the disk...