Recent content by kingstar

Yeah then it holds. The definition is provided as part of the information the exam question but i'll just assume it in the exam as well. Thanks

Yes, i agree with what you said...but the question does not mention that y > z

Homework Statement a) Consider the relation S defiend on the set {t : t is a person} such that xSy holds exactly if person x is taller than y. Determine if the relation S is reflexive, symmetric and transitive. Is the relation S an equivalence relation? Homework Equations Recall that...

Ahh, thanks! This helped me understand it a lot better

Hi, I'm reading a book on sets and it mentions a set B = {1,2,3,4} and it says that R3 = {(x, y) : x ∈ B ∧y ∈ B} What does that mean? Does that mean every possible combination in the set? Also the book doesn't clarify this completely but for example using the set B say i had another...

Yeah, but I don't see how this would help determine if the left wing tip was positive or negative :S

Homework Statement An aeroplane in horizontal flight has a wing span of 50 m and is traveling due north at a speed of 500 kmph. Calculate the emf induced between the wing tips of the aeroplane. The value of the vertical component of the Earth’s magnetic field is 5.5 x 10-5 T. What...

Thanks.

Homework Statement Estimate the energy released, in Joules, by the fission of 1g of U-235 according to the equation: ^{235}_{92}{U} + ^{1}_{0}{n} → ^{144}_{56}{Ba} + ^{90}_{36}{Kr} + 2^{1}_{0}{n} + Q atomic masses: ^{235}_{92}{U} = 235.04438u ^{144}_{56}{Ba} = 143.92279u...

Using gneil's diagram I'd just split it into 2 loops and then as 'barryj' suggested, solve them simultaneously. Will try this and check if its right. Thanks.

I am not exactly sure either, I've just copied word for word the question my professor has given.

Homework Statement AB, BC and CD are three resistors connected together at B and C. AB = 12 ohms, BC = 7 ohms, CD = 6 ohms. A battery of emf 48V and internal resistance 0.5 ohms has it positive pole connected to B and its negative connected to D. A battery of emf 74V and internal resistance 1...

Thanks for the help! :D

Woops, I'm making such stupid mistakes. The area of the square metre would just be 1, so put that into the equation 397.6 J/s 397 x 3600 = 1.4 x10^6 j/h Is that it?

Oh so would the area 4pi(0.5)^2 which is just pi... Then sub that into the equation to get 1148 J/s and then to find the total in an hour i would just do 1148 x 3600 =4.1x10^6 J/h Is that it?