Recent content by sawtooth500

So I have a dataset with 3 variables -Time -Quantity 1 -Quantity 2 Currently I have all the data in an excel sheet. So for example, I can easily in excel create a line graph that shows me quantity 1 on the Y axis and time on the X axis... however I want to see all 3 at the same time. So my...

So a bit of clarification - For any given X value, there will only be one Y value. Good point about the Y values being squared in a regression - that does give the points further away more sway - at this time we don't want to do that. The calculation we're doing can be imagined like this -...

So the linear regression formula is https://www.ncl.ac.uk/webtemplate/ask-assets/external/maths-resources/statistics/regression-and-correlation/simple-linear-regression.html found here. Question - is the slope given by the regression formula mathematically equivalent to individually finding...

So in layman's terms (sorry I don't understand the math of this) - let's say if I were to go to the sun and back at speed 2C (if that were possible), from MY reference frame I would still be going forward in time but to the reference frame of an observer standing on Earth I would be arriving...

Well yes I agree that wikipedia isn't as reliable a source, but please bear with me I'm just a layman trying to understand this :) But if spacetime doesn't move, what about gravity waves, since they've been described as "ripples in spacetime" and look just like ripples in water in every picture...

Well let me try to understand this for starters... 1. I understand that you are never considered "at rest" within spacetime in a context of GR due to geodesic motion - correct? 2. "Spacetime is not an object that can be moving." - So I look at the wikipedia article for Alcubierre Drive -...

So I'm not a professional scientist, but rather an avid physics fan. This is one question that no matter how much I research I can't find a clear answer... So for the sake of argument, let's assume that you could actually build something like the Alcubierre Drive and go FTL (I know a lot of...

Yeah basically it is a going to be a human body - rope is rather to 5000 lbs of tension, I thought it should be enough but I just wanted to be sure...

So you got 200 lbs of mass, 200 * 32.2 = 6440 lbs of force?

So basically the tension in the line is never going to exceed the weight of the pendulum, and you'd be at max tension when the pendulum is straight vertical down, correct?

You have a pendulum with a 100 ft radius and 200 lb weight. The weight is dropped at the same height as the anchor point 100 ft away from anchor. How do I calculate the tension that will exist on the line? Also, are there any other forces involved here? I need to calculate this to make sure I...

Thank you for all the help!

Well basically this question arose from the required deceleration to stop at a yellow light so as not to get snapped by a red light camera. I figured car going 30 mph (44 ft/s) and a 3 second yellow. So to figure what the "decision point" would be, 44 ft/s * 3 seconds = 134 feet, so that's...

Ok, this isn't a homework question, I've been out of school for quite some time but I'm having an argument with a buddy how to solve this - I know it's straight out of high school physics but it's been a loooooong time since high school physics... :) You have a car going 44 ft/s - now you...

So is that true for all the elements? So suppose I tossed a slab of pure uranium into the sun - I am guessing it would separate the uranium into individual atoms and those would stay at the surface? Or would those sink because U is so much heavier than Li?