Recent content by Ignea_unda

Alright. First off, make sure you enjoy and are passable at math and physics. If you struggle with these, you will struggle with just about all engineering. Additionally, are you detail oriented? Engineering is one of those fields where you can do the first 75-90% in your garage - the reason...

I'm currently working on an expanded lifting-line problem. I've got plenty of data, but I need to find the maximum oswald efficiency factor. I've got a table of data of efficiency factors for taper and twist combinations and I need to interpolate to find the maximum in 2 directions. I don't...

No worries. Sometimes it just takes a fresh glance to see it. Glad I could help.

The questions are very similar. The rule is known as the chain rule. The best way to describe is that you chain your way from the outside to the inside. If you know how to find y' for: y = ln(sin(x)) Then you know how to find y' for: y = sin(ln(x)) For the chain rule, if you have...

Alright. Remember that there is no acceleration up or down (since the ground is solid). What does this mean to the forces in the vertical direction? Can you write out an equation showing this relation? What are you looking for in the horizontal direction? Can you write out a relation with...

Think about where the ball was at each point in time. After it leaves your hands, what forces are acting on it? I don't think that after it left your hand it was accelerating up, but rather just had a positive velocity at that time.

Like I mentioned above, draw out a FBD with your forces. It will help you to see what you need to solve for.

For a lab, remember that you don't "know" gravity is -9.81 \frac{m}{s^2} since that is what you are told to find. In the most basic sense, what is acceleration? Try listing a few different ways to describe acceleration (i.e. different equations). After making the list (make sure you show...

If you haven't done so, I recommend drawing a free body diagram (FBD). It will help you to visualize what you need. Also, make a list of what you know and what you don't know. Can you construct the same number of equations as your unknowns?

It doesn't bother me. And honestly, my numbers could be way off and a jet liner could very well do 500 ktas at sea level. I don't know. As long as the thrust was enough and the structures could handle it, it could happen.

To address your answer simply, no, it could not. The reason for this is the added drag that is applied based on the increased density of the air. The jet would run into a major problem with having a strong enough structure to withstand the extra force on it. Moreover, the jet may or may not...

Alright, when considering "relative" speed, remember that it means that you are pretending that car A is completely stopped. As such, what do you need to do with its velocity and acceleration?

I'm not sure that it does. Remember, you can choose any of the clocks to be your reference frame. If that is the case, I can take the westerly plane as Reference (A), the Earth as (B) and the other plane as (C). If we can take any of the three of them to be the reference frame, then let us...

Assuming that either (a) the initial velocity, Vi, is zero, or (b) the initial velocity is at the same angle as the resultant force, you are correct. :approve:

This whole discussion about "preferred reference frames" not existing seems a moot point after the Hafele-Keating Experiment. Please correct me if I'm wrong but according to http://hyperphysics.phy-astr.gsu.edu/hbase/relativ/airtim.html" , a clock moving easterly "gained" time while the clock...