Recent content by lifeiseasy

Well it doesn't really matter. The question requires me to use an indirect truth table, so all premises are assumed to be true and conclusion false. If there is no contradiction in the truth values, that means all premises are true and the conclusion false, which implies that the argument is...

The argument is: ~(A^B) / (~A^~B) -> (C^D) / D->C // C I've attached the truth values that I've filled in. I have difficulty in determining the truth values of A and B since I can't get any clue from other statements. Any advice would be appreciated.

Thanks! I just found out that the solution is absolutely obvious if we use factor theorem.

Homework Statement Find the divisor in each of the following. Dividend = x^3 - 4x^2 + x - 1, quotient = x - 6, remainder = 10x + 17 Homework Equations Dividend = divisor x quotient + remainder The Attempt at a Solution By division algorithm, we have f(x) = [(x^3 - 4x^2 + x - 1) -...

Homework Statement A stationary uranium-238 nucleus undergoes alpha-decay. What is the ratio of the daughter nucleus to that of the alpha-particle? P.S. It's a practice problem for which I had the final answer, but I'm not sure how to reach it. Homework Equations I guess it's based on...

What makes it suitable for the technology? Why don't we use eukaryotic DNA instead? Is it because of the gene for antibiotic resistance that's characteristic of most types of bacterial plasmids?

Thanks AtticusFinch for your hints and Phrak for your correction (I just mixed them up). I think I've arrived at the answer. Is it correct?

Homework Statement A wide tank contains a non-viscous liquid. The surface of the liquid is at a height 0.5 m above a hole situated at the bottom of the tank. Assuming streamline flow, calculate the velocity of the liquid emerging from the hole. Homework Equations P + 1/2 Dv^2 + Dgh =...

Yes! Is it v=[sq. root](E/D)? Ah, it's actually just substituting numbers into the equation... Why can't I think of this equation in the first place Thanks a lot!

Homework Statement A metal rod of length 1.0 m is hit with a hammer at one end. It takes 5.5x10^-4 s for the compression pulse generated to travel to the other end and reflected back to the end hit by the hammer. Find the Young Modulus of the metal. (Given: density of the metal = 9.0x10^3 kg...

I'm studying the reaction mechanisms for carboxylic acid and its derivatives and here it says whether a compound with a C=O bond undergoes nucleophilic addition (as in aldehydes and ketones) or nucleophilic acyl substitution depends on the relative basicities of the substituent group. For...

Huh? Sorry but I can't understand. Isn't it that empty = hollow in this case?

It states that in my book "There is no charge on the inner surface of a hollow conductor." Is it really a wrong concept? Or it actually means a NET charge can only be located on the outside of the conductor...

Very sound and thorough explanation! Now I finally know what's happening in the conductor... Thanks!

A few questions about electric field here: 1. Why do charges have to be on the outer surface of the conductor? 2. Why no charge on the inner surface of a hollow conductor? 3. If charges cannot be inside the conductor, how come the electric potential is constant throughout the conductor when...