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ATSB and the Marine Corps
- Thread starter gtown99
- Start date
JTB7
Member
lol I was wondering how it got 1,000 views in a day...
Smacked_in_ATL
Banned
What are you having the most difficulty with? Read the entire section. I knew a good bit of the aviation stuff already, but reading the book in its entirty was good and I learned a lot. I take it Tuesday, I hope I do well.
The hardest part for me is getting quick at the math section because I've been using a calculator for forever!!
I am having the most difficulty finding information for the nautical stuff. I have been able to find a few terms here, latitude/longitude information there, etc. Also, the military aviation terms. I have a beginners aviation basics but things like "Zulu time" and the standard weight of oil, gas and water used by the military is not in there.
With the math and mechanical it is simply a matter of brushing up on some of the basic formulas and ideas such as factoring and how to figure the area of a cylinder. I had a bit of trouble at first but my correct to incorrect answer ratio has improved immensely over the past two weeks.
atrickpay
BDCP SNA
Sinatra
ALOHA LAMPS
Think of this as a diving board. As you (the block) move further toward the end of the diving board (the right end) it will "see" more weight and deflect downward. As this happens, the rope will "see" more weight (tension) because it is trying to hold the end of the board up; countering the downward force the block caused.
At position A there is no deflection because the block is on the anchored side of the folcrum.
First, I don't remember seeing a question like that on the ASTB. Second, that's a horrible diagram.
To me, it looks like it's a simple model of a tower crane, meaning that the 'anchor' is not attached to anything - it's there to balance any loads on the right horizontal support. The term 'anchor' does not necessarily mean a rigid attachment. The answer depends on whether the anchor is a just a weight, or a rigid point of attachment for the horizontal support. It also depends on whether that string can slide across the top of the vertical support, or if it's attached there.
Here's a quick list of answers for an attached/non-attached anchor, and a sliding/non-sliding string:
Attached/Sliding: B. B causes more tension because it bends the horizontal support and stretches the string, A can't pull the string because the anchor supports it's weight, and the left horizontal support can't move.
Attached/Non-sliding: C. The tension at both weight locations is 0 because the anchor supports A, and the bending caused by B doesn't pull the string on the left side.
Non-attached/Sliding: Unanswerable. It depends on the relative weight of the block and the anchor, and the relative distance of A and B. Both positions will cause more overall bending of the support and stretching of the string, but you can't tell how much without numbers.
Non-attached/Non-Sliding: A. B won't affect the tension, because the string isn't free to slide. A will increase the weight on the left horizontal support, causing it to bend more.
Since the word "string" is written only once, I guess you're safe assuming that it's one continuous string, and is free to slide. You can also assume the question is answerable, so the anchor probably is a rigid attachment. So, the answer is probably B like Sinatra said. I guess I made the whole thing more complicated, but I really hate bad diagrams and questions that give incomplete information.
To me, it looks like it's a simple model of a tower crane, meaning that the 'anchor' is not attached to anything - it's there to balance any loads on the right horizontal support. The term 'anchor' does not necessarily mean a rigid attachment. The answer depends on whether the anchor is a just a weight, or a rigid point of attachment for the horizontal support. It also depends on whether that string can slide across the top of the vertical support, or if it's attached there.
Here's a quick list of answers for an attached/non-attached anchor, and a sliding/non-sliding string:
Attached/Sliding: B. B causes more tension because it bends the horizontal support and stretches the string, A can't pull the string because the anchor supports it's weight, and the left horizontal support can't move.
Attached/Non-sliding: C. The tension at both weight locations is 0 because the anchor supports A, and the bending caused by B doesn't pull the string on the left side.
Non-attached/Sliding: Unanswerable. It depends on the relative weight of the block and the anchor, and the relative distance of A and B. Both positions will cause more overall bending of the support and stretching of the string, but you can't tell how much without numbers.
Non-attached/Non-Sliding: A. B won't affect the tension, because the string isn't free to slide. A will increase the weight on the left horizontal support, causing it to bend more.
Since the word "string" is written only once, I guess you're safe assuming that it's one continuous string, and is free to slide. You can also assume the question is answerable, so the anchor probably is a rigid attachment. So, the answer is probably B like Sinatra said. I guess I made the whole thing more complicated, but I really hate bad diagrams and questions that give incomplete information.
atrickpay
BDCP SNA
That is a relief. Thank you both for the explanations, it makes much more sense now. I was looking at the diagram differently, assuming the anchor was attached and that the string was non-sliding at the top. The picture just left me wondering exactly what was even going on.
atrickpay
BDCP SNA
Yeah, then I wondered why they gave you a specific point on the string. That is useless when it is a single string, because the tension will be the same at any point. Oh well, as long as the exam itself isn't that vague.
BullGator
Active Member
For the ASTB, in general, the questions are not about memorizing all the questions. It's all about understanding them. (Ask why, when you don't get something.) This is not saying every question in math and mechanical are tricks, but several can be (with it being multiple choice, it really isn't that tricky. One or two will trick you up, but the others you will notice).
I can't give away too much, just for that problem understand it as if the rope is going through a pulley with a MA of 1: the tension is the "same" amount on either side, for each respective box location. I know the pulley equivalent is a strech, but it helped my mind think about it "logically." Because before that I was thinking, "is this answer wrong or my intuition?"
Did that all make any sense at all?
atrickpay
BDCP SNA
Yeah it makes sense. The bad picture is really all that threw me off, because as mentioned above there are many ways to look at it and each way will lead to a different answer.