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I am planning to build a robotic arm for a particular event in division C science Olympiad, but I am relatively unfamiliar with practical electronics (I know all the math, just not the hardware of it). The robot arm needs to pick up particular objects using a control that you make yourself. For the robot, I was planning to use 4 servo motors (rotation, grabbing, wrist, and elbow). However, I was considering a master-slave interaction to control the robotic arm, as I noticed that the top teams generally succeeded with this concept. Also, in my 'research', I noticed that for the master-slave concept, people used potentiometers for the control wired to an arduino microprocessor. What kind of potentiometers would I need, and how exactly do they work? Also, is there programming necessary to use these potentiometers to control the slave arm?

Area = π × r² : 1/4 of that would be 1/4 × π × r²

or

Area of sector = 1/2 × r² × θ : θ = angle in radians :1/4 circle is 90º = 0.5π rad = 1.5707963268 rad

Area of 1/4 circle = 1/2 × r² × 1.5707963268

 

Circumference = 2 × π × r : 1/4 of that would be 1/4 × 2 × π × r = 1/2 × π × r

oh sorry i don't think u understand what i mean im talking about the equation of a quarter circle on a graph which has an origin as its center

im just wondering what the equation of it would be if it were plotted on a graph

I dont even know if there is an equation for this, but what is the equation for a quarter circle that has a center at the origin?

 

But that is because of their mass. (They obviously have non-zero density as well, but that is also a consequence of their mass.)

yeah, so thats why mass curves space time . thats what i have been saying

"Religion is used to explain what hasn't been publicly explained by science. Easy."

Can you give some examples please?

Also, please remember "God id it" isn't an explanation of anything unless you can explain where God came from and why He did it.

 

BTW, had you read all the thread before you posted?

actually i am only answering to the original question of this thread. and an example is what happens to our "soul" (proposed by religion) after death. Science has not been able to publicly make a theory about this, so different religions have made multiple explanations for it.

 

Note that you can only see laser beams (in the air) because there is dust or mist and some gets reflected into your eyes.

ok thanks

 

I'm afraid I don't understand the question. You can only see light when it hits something and is reflected into your eyes.

OOHHH oops my bad I was thinking about laser beams not beams of sunlight my bad never mind that question.

As it is sunlight it will be visible light (although, as with all light, you will only be able to see it if it hits something - which is normally something carrying a fluid to convert the incident radiation to heat and carry it away to do something useful).

Sorry I think I stated the question incorrectly (scientifically). I was trying to ask with a parabolic trough, will the light be in one complete beam or will you only see light at the point in which it comes from and the point at which it hits

I'm just saying that all planets that do have a density greater than 0 will bend space time

Well wireless charging doesnt have to mean floating electricity. It could be manually generating electricity, like how some of those flashlights work, in which you spin the handle and that charges the flashlight.

Sources: I have one of those flashlights

Thanks. Just one question though. Will the line be visible light or will it seem invisible( for the trough)?

Religion is used to explain what hasn't been publicly explained by science. Easy.

What about the fact that celestial objects bend space time, causing gravity?? I saw this in another forum.

Well, my guess would be that matter is made of compressed spacetime, so there's less spacetime to go around nearby matter. Of course that's just random gibberish until someone finds an equation that would describe such and checks that the predictions are correct. Is that the sort of "why?" that you were looking for? Because if you were looking for a "why?" that would not involve new equations, the sort of question that Newton thought irrelevant to his idea of gravity, then science isn't really the place to look for such answers.

Well actually I agree with Mr Skeptic but in another way...doesn't any object with a higher mass have a higher density? And obviously dense objects sink, causing the bends in space-time which is why the planets with more density or mass would have more gravity. This is not a topic i have dwelved too much into but i am just using logic to prove this.

Hey I am a new member here at the science forum! I recently have been doing some research on optics and started experimenting with laser lights. I started to place mirrors around my room and reflecting laser beams off of them. After a while of just random experimenting, a thought came into my head. What would happen if I could collect light from the sun using a mirror that would reflect the light at one point? I researched this topic and found out about parabolic reflectors and parabolic troughs. So if I were to concentrate sunlight at one focus, which would be better (in terms of more heat): a parabolic reflector (like a bowl shape), or a parabolic trough?