RuneScape Forum Archive | Scientist thread

B O R A T25

Posts: 37 Bronze Posts by user Forum Profile RuneMetrics Profile

Got banned on noname aka the real bad African, but I won't go into details.

I'm currently starting work on my physics project. What I basically have is a purely mechanical device that is activated when someone steps on the top of it. The pins that are holding down a restoring spring force are pushed aside. The spring force then pushes an axle with a large circular frame up when the foot is removed. Since the pins are no longer around to hold the frame, the main component (circular frame and axle) is free to spin. The is a string attached to the main component, and the string is also attached to a weight that is at rest on a jerry rigged pulley until it is free to spin. The weight drops, and this creates a torque on the main component. This torque causes the main component to accelerate radially, and then BBs start flying out. I haven't completely worked out all of the physics for this project yet. But it should be interesting. I'll start some of the calculations tomorrow. Such as finding the spring constant of the spring. I keep telling people I am Not Sea ! I am African! Appeal to it!
I will abide by the African code of conduct.
I am the real Bad African.

06-Jun-2015 06:44:51

The contents of this message have been hidden.

06-Jun-2015 09:13:22

Jul

2004

Ms Toxicity

Forum Moderator Posts: 78,314 Emerald Posts by user Forum Profile RuneMetrics Profile

Jane Eyre, using the forums to discuss another player's conduct is not welcome. As such, your post above has been removed.

If there is a problem with the conduct of a player in the forums, please report the matter to the Forum Help sticky thread. If you believe that a Forum Moderator has acted inappropriately, you are welcome to share your concerns in the Forum Moderation Review sticky thread.

•

Forum Help

•

06-Jun-2015 09:30:07

4A6F6B6B75

Posts: 35,046 Sapphire Posts by user Forum Profile RuneMetrics Profile

.

06-Jun-2015 12:23:37 - Last edited on 03-Jul-2023 17:40:20 by 4A6F6B6B75

Many Much

Posts: 4,130 Adamant Posts by user Forum Profile RuneMetrics Profile

4A6F6B6B75 said :
Pokemon master!

But almost all games have formulae. There are many formulae in Runescape. Like the skill level formula, check it up if you wish

And about Pokemon... The science is interesting in Pokemon tv series. I remember an episide where Pikachu dodged electric attack by standing on its tail. Like wtf

Episode 14 I think it was. Pikachu vs Raichu. Yea it was in a gym and the tail was acting like a ground type avoiding electric attack moves

_____________________________________________

By the way, my Milotic has very great stats:

Lv 100.
Type: Water
Ability: Marvel Scale
Nature: Modest
Item: Sea Incense

Attack Moves:
Ice Beam
Surf
Recover
Dragonbreath

Stats:
HP:

341

EV:

40

IV:

31

Atk:

117

EV:

0

IV:

5

Def:

252

ÉV:

240

IV:

29

Sp Atk:

301

EV:

170

IV:

27

Sp Def:

301

EV:

60

IV:

31

Spd:

185

EV:

0

IV:

18

*

* Why my Milotic only has 18 IV on Spd is because when it was hatched from an egg it had 13 Spd (IV 0-19). If it had 14 Spd then the IV would be 20-31 instead.

^ I did a nice calculation before training it and made it into a tank and pure.

How many much more do you want?

06-Jun-2015 14:20:09 - Last edited on 06-Jun-2015 14:58:32 by Many Much

B O R A T25

Posts: 37 Bronze Posts by user Forum Profile RuneMetrics Profile

Ah Jawanzeh ngogo Ms. Toxicity

you have this African's gratitude.

I was going to impart some of my tribal African wisdom, but I guess this works as well.

An unnamed bawana thought she could insult the Emperor of Africa. HAHAHAHAHAH!

Shakala boom as my village always says

-------------------------------------------------------------------------------------------

Anyway now I'll be serious for this bit since I'm here.

For calculations I know I can get the moment of inertia for the main component since I have it at the moment, but I'm not so sure if I'm getting the spring constant correct though.

For the moment of inertia I was thinking

I = 1/2 MR^2 (M=mass and R=radius) since the main component is basically a solid disk, and I believe this should be close enough to match it.

For the spring constant, what I found online that I should've remembered was how to find the spring constant. I know the conservation of energy, but didn't know how to go about it.

We know that F = Kx (F=force K= spring constant and x is the displacement)

What I could do is hang the spring up somewhere, and then attach a weight onto it. After that, I see what the length of the stretched spring is and deduct the original length from the new length to get the displacement. I know the F=ma (m= mass of weight a=acceleration due to gravity), and from there I can do a bit of algebra to find K. I have doubts this will work since it's a restoring spring, but hey I could always check online or ask a teacher.

I'll be back to post more information on my little project. You're all welcome to chime in if necessary. I keep telling people I am Not Sea ! I am African! Appeal to it!
I will abide by the African code of conduct.
I am the real Bad African.

06-Jun-2015 18:56:11

Mar

2020

Dracule

Posts: 7,459 Rune Posts by user Forum Profile RuneMetrics Profile

Aeroxmaster said :
Many Much said :
Rigor mortis.

When a person dies, there is a process that starts in the corpse.
Protein in the muscles will start hardening.

The protein doesn't harden but I know what you mean.
Muscle contraction requires something called ATP (Adenine Triphosphase); which essentially is the currency of 'energy' the human body uses.

After a person dies, muscles can still temporarily contract and relax because they still have a concentration of ATP left. Once the ATP is depleted, the muscles enter a constant state of contraction because of the Calcium ions facilitating the protein bridges. With no ATP, myosin - one of the proteins in the bridge - cannot be moved and so the bridges cannot break.

This is Rigor mortis.

¸‹^¹´', ¸¸·¸·¸¸ ,'`¹^›¸

.

Dracule

.

¸‹^¹´', ¸¸·¸·¸¸ ,'`¹^›¸
' ´`· ˆ , -¸ . ¸- , ˆ ·´` '

………………..

' ´`· ˆ , -¸ . ¸- , ˆ ·´` '
'·ˆ·'

.………

I don't like steak

……….

'·ˆ·'

07-Jun-2015 01:34:15

Mar

2020

Dracule

Posts: 7,459 Rune Posts by user Forum Profile RuneMetrics Profile

Take a look at your phone. Have you ever tried to flip it end over end? If no, then give it a go!

But before you do what do you expect to happen? The phone to rotate cleanly end over end possibly?

Turns out, if you do give it a go, the phone has a bizarre physical phenomenon where it ends up going through an unsteady rotation before being caught (or dropped if you forgot how to catch!). Why?

This is down to something called Moment of Inertia, which essentially is determined by depending on the distribution of the mass of the object, it's shape and the axis it's rotated in. It is the latter most which is very important here.

If you try flipping your phone on the horizontal axis - flip while you hold your phone on the longer length, it's a clean rotation.

If you try flipping on the vertical axis - turn your phone on its side and flip, you'll also find that it's a clean rotation as well.

But flipping your phone end over end - along the intermediate axis - doesn't produce a clean rotation and that's due to the instabilities adding up from the mass distribution. As a result, the phone cannot flip cleanly as it is forced to rotate on a different axis along the way.

¸‹^¹´', ¸¸·¸·¸¸ ,'`¹^›¸

.

Dracule

.

¸‹^¹´', ¸¸·¸·¸¸ ,'`¹^›¸
' ´`· ˆ , -¸ . ¸- , ˆ ·´` '

………………..

' ´`· ˆ , -¸ . ¸- , ˆ ·´` '
'·ˆ·'

.………

I don't like steak

……….

'·ˆ·'

07-Jun-2015 02:14:18 - Last edited on 07-Jun-2015 02:17:34 by Dracule

Nov

2021

RubiksCube77

Posts: 943 Gold Posts by user Forum Profile RuneMetrics Profile

More on the physics above. Newton found that an object's acceleration is due to a force. Hence the equation F/m = a, and that is analogous to T/I = a. T= torque I = moment of inertia a = (radial) acceleration F= force m=mass

In this situation, since the object is rotating, it is appropriate to use T/I = a. At t naught, a force was applied to let's say one end of the phone to make it go up. A torque is the cross product of force and lever, and the lever is the length of the phone. The torque causes the phone to accelerate radially, and we can see that an object's moment of inertia does play a role in the object's radial acceleration if we look back at the equation. When the object is spinning, its axis of rotation is at the centroid of the object, and that itself can sometimes not even be in the object itself either.

I don't think the objects rough rotation is because of the moment of inertia itself, but I'll have to look into that sometime. I'm currently in the third of calculus based physics, but I'll admit the natural sciences aren't necessarily my forte, but I need to know it though.

Let me think about it; I'll come back to this. This is interesting. Make RuneScape Great Again usually on at 3:00 PM PST
I am the Emperor of Africa, Afrikaneer Engineer, and retired RSOF troll
The Real Bad African (shenanigans moved to YT under an assumed name)

07-Jun-2015 08:32:49

Nov

2021

RubiksCube77

Posts: 943 Gold Posts by user Forum Profile RuneMetrics Profile

I'll make my educated guess here.

I'm imagining you're flipping the phone from corner to corner. The value of the moment of inertia does depend on the geometry of the object. I won't disagree with that, but it stays constant throughout the rotation. The distribution of mass however may affect where the centroid is (imagine a dumbbell like object with more mass on one end; the centroid is closer to the end with more mass), but the phone should have an even distribution of mass throughout the phone if it has a clean rotation on a horizontal and vertical flip in your example. I'd actually argue that it's the position of the phone that affects the torque of the object that gives the phone's rough rotation. If we look at the lever arm, it's not going to produce an even torque throughout the body if we applied a force, and that's why we have the rough rotation.

In the end, the objects radial acceleration is the net torque over the moment of inertia.

If you're back tomorrow, I'd be glad to hear your input. And if anyone spots an error, please let me know. Make RuneScape Great Again usually on at 3:00 PM PST
I am the Emperor of Africa, Afrikaneer Engineer, and retired RSOF troll
The Real Bad African (shenanigans moved to YT under an assumed name)

07-Jun-2015 09:02:25

Forums

Scientist thread