Recent content by spl-083902

That's right, the forward acceleration of the car would have to be greater. However, you're still missing something. What would cause drag on a car at rest? If a rock is at rest on the ground does it have drag? Does a car parked in a garage have drag? Why would that answer change if the car...

Drag is velocity dependent, not acceleration dependent. Think about what is it that physically causes drag on a car. Also, remember that the way the car will ultimately move is going to be the direction of the net vector. So always check that it makes sense. If you're saying that your largest...

For the car problem, what is the drag on an object at rest? For the rocket, check to see if the sum of all your vectors makes sense, if they were all placed head to tail.

How are you eliminating the constant from the equations? and why do you think you need 2 equations to solve it? I think you can do it with just 1

I'm sure you know this equation v=\frac{d}{t} and just do it in sections

Having this as a factor in relationships is something I can live with. What bothers me is how it plays roles in things like job interviews. You can argue that someone who looks nice is probably a nicer person and will be better for morale in the workplace, etc... But those are logical arguments...

Actually on second thought you should probably just treat it as positive. Getting a positive acceleration on an object traveling in the negative direction is still causing the object to slow down and I think the point of this problem is for you to call that negative acceleration. So for this...

West is only negative if you define it to be so. It would be good practise to see how you get the same answers for this problem whether you take west to be negative or positive. You put N/A for relevant equations, but you could have put an equation relating acceleration to change in velocity...

Looks like you did it right. Other than writing 0= 30 +(-0.015)(t) = 2000sec which is technically wrong since 0 != 2000sec. You should put t=2000s on a separate line

This is one area of physics that I think gets easier when you get to more advanced levels, where such a procedure exists. But for basic physics I would say to try this. Just quickly ask yourself what is doing the work, and what is it doing the work on. Then just quickly think about W=F*d to...

r-hat (\hat{r}) is a unit vector. Unit vectors have a length of 1. In this way you can separate out the "magnitude" of a vector from its direction. So you can think of r-hat as a vector (of length 1) that points in the direction from the particle to where you want to measure the force at. Any...

To understand this just find the probability distribution of a linear combination of wavefunctions passing through each slit: \Psi=R_{1}e^{i\theta_{1}}+R_{2}e^{i\theta_{2}} and find |\Psi|^{2} You should end up with R1^2 + R2^2 plus a cross term which exhibits the interference. Then to see why...