Recent content by keroberous

I'm glad I wasn't going crazy! If only that was an option. lol Thanks!

So your diagram isn't all that different than mine, so I take it then that the textbook is incorrect and the statement is false? Here's the book's entire reasoning: "true; |a+b| and |a+c| both represent the lengths of the diagonal of a parallelogram, the first with sides a and b and the...

This is a question that I saw in a textbook: "If the magnitude of a+b equals the magnitude of a+c then this implies that the magnitudes of b and c are equal. Is this true or false?" The textbook says that this statement is true, but I'm inclined to believe it is false. I made a quick sketch to...

Thanks for your answer. I'm still not clear as to why exactly the second derivative at zero for x^4 should be zero. The function is clearly concave up at this point (isn't it) so should it not be a positive second derivative? Also, I'm not quite sure what the difference is in the changing...

Hi there. I'm having some trouble wrapping my head around some ideas of inflection points as they relate to the second derivative. I know that an inflection point occurs when f''(x)=0 in most cases. This makes sense to me because at this inflection point the slopes of the tangent change from...

Here are two questions and I'm not sure how they are different.

I have some questions regarding the sign of potential difference. For example, given the literal definition as the difference in potential between two locations it should be possible for potential difference to be negative if the final potential is less than the initial, but while reading texts...

Here are the two questions I want to compare: 1. A student of mass 62 kg stands on an upholstered chair containing springs, each of force constant 2.4 × 103 N/m. If the student is supported equally by six springs, what is the compression of each spring? 2. A 0.20-kg ball attached to a vertical...

Hi folks. I am trying to reconcile the additive colour theory of light with more traditional grade school colour mixing. For example, we all know that blue paint plus yellow paint makes green paint. How do we explain this from the perspective of light? So the yellow paint appears yellow because...

Homework Statement My main conceptual issue here surrounds positives and negatives as they apply to electric potential difference. I will post two questions that illustrate my confusion, if that's ok. 1) The electrons in an old TV picture tube are accelerated through a potential difference of...

Thanks all for your help!

Homework Statement A bomb initially at rest is exploded into three pieces on a smooth, horizontal surface. Two pieces fly off at a 60° angle to each other, a 2.0 kg piece at 20 m/s and a 3.0 kg piece at 12 m/s. The third piece flies off at 30 m/s with an unknown direction. Determine the...

thanks so much for your help

Ok, so here's what I ended up doing so far. I first looked at the vertical velocity, and determined what it would have to be to go 1.5 m up (i.e. to just touch the ceiling). So v2 = 0, a = -9.8, d = 1.5, and I'm looking for v1. the equation I used was v12 = v22 - 2ad and found v1 to be 5.4 m/s...

I'm a little new here and was hoping I might be able to get some help. This is the question I'm having problems with: A hallway is 40 m long and 3 m high. Could a professional baseball pitcher throw a ball from one end to the other before the ball hits the ground? I haven't really even...