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starfish794
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How would I plug cos^2(30) into my scientific calculator to get the right answer? Thanks.
Plug cos^2(30) into my scientific calculator
- Thread starter starfish794
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To calculate cos^2(30) on a scientific calculator, first understand that cos^2(30) means (cos(30))^2, not cos(30*30). This involves first finding the cosine of 30 degrees, which is 0.866. Then, square that result to get approximately 0.75. It's important to clarify the notation, as cos^2 T indicates squaring the cosine value rather than multiplying the angle by itself. Properly interpreting the expression ensures accurate calculations.
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arildno
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What does cos^2(30) mean? 
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starfish794
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I don't remember, its been years since I've done that kind of math.
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arildno
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Well, then, look it up in a math book.
Hint: What does ^2 mean in the expression?
Hint: What does ^2 mean in the expression?
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- #5
kinthos
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There is a distinct difference between cos T^2 and cos^2 T. (Pretend that T=the angle.) Your problem asks for cos^2 T, or (cos T)^2 (calculator form). This means (cos T)(cos T), rather than cos (T*T).
TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance)
My thoughts for the first case , one of them must be 12 volt while the other is 0
The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
Here is what I tried
This question was actually asked in one of our engineering entrances.
The answer was 1D.
My teachers say that we have to use μₘ/fₘ to get to this answer. I cannot understand why. I'll be really glad if you could tell me the exact definition of power (numerically) that works in all scenarios.
The answer to this question is statements (ii) and (iv) are correct.
(i) This is FALSE because the speed of water in the tap is greater than speed at the water surface
(ii) I don't even understand this statement. What does the "seal" part have to do with water flowing out? Won't the water still flow out through the tap until the tank is empty whether the reservoir is sealed or not?
(iii) In my opinion, this statement would be correct. Increasing the gravitational potential energy of the...
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