Recent content by ckp

now, what if it is asked if a sub n is in the span of A (A consists of {a sub 1,...,a sub n})

So, say it is consistent. Then what do I do? (rr took a long time and numbers are rather large)

Is this possible with A being 4rows x 5 columns and b 4 rows 1 column?

so would it not have a solution because there are 4 eq and 5 unknowns? also how would i justify in terms of span that there is no solution? (as opposed to just saying because there are 4 eq and 5 unknowns)

How would i go about telling if vector b (4 row, 1 column) is in the span of the columns of matrix A(4 row, 5 column)? im just not sure what is asking, i know it would be an easy question if i knew what they meant by this.

ha, nevermind. I'm sorry, I messed up the integral of sec(X) >_> got it now.

i was trying to use an integrating factor, but I am not sure if I am using it right. the long mess is what i end up with and i can't go any further. my book doesn't do a very good job of explaining it

dr/d(theta) + r*sec(theta) = cos(theta) apparently the solution is (sec(theta) + tan(theta))*r = theta - cos(theta) + c but i have no idea how to get there. i am using a technique from the book, but it yeilds an answer with lots of e's and an integral i can't solve. this is my work...

Where did you get p = sqrt(2mE)?

anyone?

so E^2 = m^2c^4+p^2c^2 my E^2 is less than my m^2c^4(the 10MeV is less than the mc^2 for a proton) so my p^2c^2 turns out negative. What am I doing wrong?

How much energy must a photon have if it is to have the same momentum of a 10-MeV proton? I am not sure how to go about starting this one. Can someone help me out?