The probability of an event A occurring is 1/5, the probability of event B occurring is 1/8 and the probability of both A and B occurring is 1/30. What is the probability of A or B?
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If you have a homework problem do it yourself, but feel free to ask about concepts relating to it.And that is exactly what am doing. So what else do you have say?
Be plain and simple. What are you saying?-Remember the purpose of this forum is not for answering homework, and the question you posed sounds suspiciously like an assignment or exam....What are you saying? You mean a student preparing his exams or serious about his studies cannot learn using this forum? Is that what you mean?
Studying for exams is fine. We just don't want people posting their problem set here, waiting a week, and then copy-paste the answers. The fact that the question looked copy-pasted from somewhere was somewhat suspicious. I wasn't accusing you of anything, just making sure your aim and ours are in line.
-Remember the purpose of this forum is not for answering homework, and the question you posed sounds suspiciously like an assignment or exam....What are you saying? You mean a student preparing for his exams or serious about his studies cannot learn using this forum? Is that what you mean?
the square of the distance apart will be reduced by 2
Another way of saying this is that the distance must be reduced by the square root of 2, which is approximately 1.414.
50mm divided by 1.414 is roughly 35mm.
This is the answer in words. If this is a homework assignment, you will need to work out the answer as an equation, and provide it to more decimal places...
You are right that the square of the distance must be halved.
i think you have used the wrong formula...
basically what you should think is... that the work done to the catapult... will convert... totally into kinetic energy of the stone...
force in the formula (F e ) is F ..and you are explicitly writing it 1/2 F... is already given to us as the avg...force.. we don't need to take the avg..of the avg force...
so... F e = 1/2mv^2
and now.. you will get it right...