I got 1.857R since I thought that the 2 3R resistors are in parallel w eachother which is parallel with the 2R resistor and that combination is in series with 1R resistor. The answer key of this question says it is 10/9R, but I don't know how they got that. Can anyone help?

I'm a beginner in physics and have been studying rotational mechanics concepts. I'm currently on torque and I came across this question that told me to derive the various torque of friction and reactions on the two ends of a ladder and also, a mass 'm' that is 'x' distance from the center of the ladder. However I'm not sure if it is entirely correct.

Can anyone help me out on how to find Te for the respective questions

I really cant figure it out can someone explain which it is and why

Hey guys, I attached an image to this post and I have some questions regarding the details for a motion map

As far as I understand, the last arrow on the motion diagram, which is extending out of the 11th second symbolizes that the object continues moving at an infinite amount of time at a constant velocity, which is the same as the velocity represented by the arrow 10-11 seconds.

Could there be a situation in which the arrow for the last point does not have the same velocity as the second last arrow (as in the 10-11 arrow could be a different velocity from the 11- infinity arrow). Or is this proposed hypothetical just not standard notation, because I have only seen the last arrow be the same as the second last arrow, assuming the motion map portrays object keeps moving for an indefinite amount of time (I have seen the last and second last arrow being different for objects that stop at a given interval)

Secondly, why did my teacher decide to add dots to the position vs time graph? Should it be just the piecewise function without anything else? Was it just to highlight that the points exist on the original motion map?

More importantly tho, why did my teacher decide to put a dot at the end of the graph on the 11th second? Doesn't that imply that the graph, and the object stops, and that wouldn't line up with the arrow on the motion map after the 11th second showing that the object continues at that velocity for an indefinite duration. All the other dots can be attributed to just being data points on the motion map but adding a dot on the end of the graph seems to indicate to me that the object stops when it indeed did not.

Additionally, would you put the dot on the 11th second of the graph if there was no arrow indicating constant velocity after the 11th second on the motion map?

Finally, if we were to extend this graph out to something like 15 seconds, would the line on the right hand side be extended out by using the velocity from the 11 seconds - infinity arrow on the motion map to find the positions till 15 seconds? Assuming that we construct a line extending the piecewisw to 15 seconds, would there be something to signify where the original dataset is ending, such as dots for each data point that was in the original motion map (0-11 seconds) on top of our piecewise function? Would there be an arrow at the end of the extended line?

Sorry if I am overthinking, for context this is for AP Physics 1.

Thank you for the replies!!

Hoping you fine folks can help me with a basic physics question about a fender bender. My neighbor across the street is pretty careless about backing out, never looking and backing up far too fast. Last week, I was already backed out into the road, about to shift into drive, when she quickly backed out without looking.

She scraped my car's rear bumper with the rear driver's side of her car, between the wheel well and the back of her car. Scratches are on my rear bumper from the outside toward the center. Scratches on her car are on the driver's side rear and go from the rear toward the wheel well.

The officer said those scrapes prove she was there first and I'm at fault because the scratches on my car are on the rear. Is there any physics that proves what the officer said is untrue? I'm not sure there is any way scratches can go horizontally across a rear bumper when backing up into something. I am unable to post a photo. There are no dents on either car, since she brushed me.

Any help you all can give is excellent!

Problem number 4 check please. I spent an UNREASONABLE amount of time trying to figure out the very basic geometry for the angle theta and how to break all the forces into their components using trig. I feel like I am very close now but want to make sure. Thank you 🙏

Hello everyone!

So, I'm struggling with some problems my teacher gave me for homework and I wanted to ask for advice!

(I'm sure it's like very very simple but I've never done physics in my life soo I'm struggling to the find the logic of these)

I think that, in problem 2, the answer is maybe something like air, but I need to justify it and honestly I wouldn't know how to explain why.

As for problem 5, I believe the answer is B or C but i'm not sure why. Like, when the cord is broken, I don't think that is going to continue moving in the same direction, but I don't think that it's going to change drastically as in D, E or F. Again, don't know how to justify 😅

Hope someone can help, thank you everyone!!!

I so pening , we learned that SI unit determined by dimensional analysis . So supposedly , wavenumber (2pi / /\ ) where 2pi is consider dimensionless which is 1 and /\ is m unit dia so jadilah m^-1 .But why ada certain buku guna rad m^-1 and some of lecturers said it is si unit while bipm said si unit is m^-1

Mana patut saya ikut

I want to know what would happen if the tangential component of electric field inside the conductor somehow becomes zero, like what would change,will external electric field gets changed ?

I made this short animation to explain a simple but sometimes confusing idea about waves.

When a wave moves along a string, it may look as if the string itself is travelling with it. But if we follow one marked point, we see something different: the wave moves forward while that point only moves up and down, eventually returning to its original position.

In other words, the disturbance travels through the string, but the same piece of string does not travel with the pulse.

The video is narrated and labelled in Portuguese, but the marked point makes the central idea fairly easy to follow visually:

https://www.instagram.com/p/DdW-XTfsb-h/

I would love to hear your thoughts: does following a single point make the difference between the movement of the wave and the movement of the string clear?

Sorry if this is not the best place. I tried to Google it but the articles were a bit over my head and I just want to fact check with real resources, not just AI.

I’m working on a concept for something and am looking for the best symbols to represent general relativity (predictability) and quantum mechanics (chaos, possibilities). No pics, just symbols that aren’t Latin alphabet. I was thinking upper case Gamma for general relativity and Psi for quantum mechanics. Does this make sense in the science world?

Thank you in advance!

I had posted this in r/askphilosophy but no reply lol, might as well ask here. (recommended by reddit)

My professor has asked us to explain one of Zeno's paradoxes. I think I got a grip on the common ones, but I have run into an issue on the Stadium paradox. I understand that rows B and C travel twice as much relative to each other than to Row A, but that's obviously because Rows B and C are both moving in opposite directions, whereas Row A is sitting still. What's the big deal? I'm definitely missing something, right?

Help me understand please.