Recent content by kring_c14

ive found the answers on these problems.. bur i can't still figure out the solution..help! #1. 1465 khz #2. a.)5870 b.) 33.8 #3. 93.6 #4. 51 db

this is our last quiz on communication.. fortunately, the whole class got zero on this quiz so the professor arranged a retake and made it a take home exam instead.. this is my last hope on passing the course.. so any help would be greatly appreciated.. 1.A superheterodyne receiver having an...

[b]1. a.how many ways can you arrange the the letter of the word PROBABILITY? = my answer for this is 11!/(2!*2!)=9979200 b. how many of these arrangements start with letter B = itried considering the two B as one, so i have 9!/2!=181440 after this, I am stuck.. c. how may of these...

steams of charge particles emitted from the sun during periods of solar activity creates a disturbance in the Earth's magnetic field. How does this happen? also, the text in our book discussed the magnetic field of an infinitely long, straight conductor carrying a current. Of course there is...

I am so sorry if i didnt post any solutions to this test.. i just can't understand it.. this is supposed to be a self study topic...and this quiz is due tommorow...well,, can any of you recommend some site where there are sample problems like this one?? i found some. but i need more reference...

sorry..i typed the wrong letter...it should be "a".. may you pls explain further.. should i differentiate the equation?

The velocity of a particle moving along the x-axis is given by v=x^{3}-4x^{2}+7x whwere x is in meters and v in m/s. determine the acceleration when x=5m... the thing i know is that i just can't differentiate v to get y, since it is a function of x.. i don't know if chain rule would...

ok I got it already...lots of thanks!

i don't know if my solution is correct since the tank initially contains only pure water...

Homework Statement A tank contains 80 gallons of pure water. A brine solution with 2lb/gal of salt enters at 2 gal/min, and the well stirred mixture leaves at the same rate. Find a.) the amount of salt in the tank at any time and b.) the time at which the brine leaving will contain 1 lb/gal...

i don't know where I am wrong.. there was another problem on Newton's law of cooling where I got a negative k.. but I got the right answer..

yes, it is ln(T-Tm)]^{T2}_{T1}=kt]^{t2}_{t1} Ive already computed the value of k..it is -0.40 this is what I did ln(26-(-10))-ln(70-(-10))=k (2) ln(36/80)=2k k=-0.40 did I do it right?

heeeelllppp..

the answer in the book is 56 F but I couldn't get it right..

I was absent the day this was discussed..I would really appreciate some help..thank you//