================== Homework 2 ================================
Dr. C.,
I have a few questions so hopefully this goes smoothly, if not then I
guess there is always Homework #3 to do well on.
Problem #3 (b)- I am not sure how to figure out how big one side of a
singular transistor would be.
Problem #4 (a/b) - I am really not sure of how to start this problem and
any pointers would be appreciated about 1e9 times over ðŸ˜ƒ
Problem #5 - I gathered the volume of the earth and multiplied it by
.4501 to get the total amount of water in meters cubed but where to go
from there I am completely unsure.
Problem #6 - Figuring out ratios is eluding my brain and im not sure how
to start this either.
from YYYYYYYYYYYY.
-----------------------------
Hi YYYYYYYYYY,
For #3, I think that you might be referring to problem #1, since #3 is
about a party. In the first part where you find the number in one square
meter, invert that so that you have m^2/transistor, and then take the
square root of that.
for #5, once you have the volume of ocean in m^3, convert it to liters,
then to gallons, then to megagallons (by essentially dividing by 1e6)
and then the human population! You're almost home!!
For 6, suppose the boxes are the same shape and that one side on , say
box 2, is 2.3 times the corresponding side on box 1. So the volume of
box 2 is V_2 = L_2 W_2 H_2, but we have L_2 = 2.3 L_1, W_2 = 2.3 W_1 and
H_2 = 2.3 H_1, so that L_2 = (2.3 L_1)(2.3 W_1)(2.3 H_1) = (2.3)^3
L_1W_1H_1. But L_1W_1H_1 = V_1, so the previous statement reads V_2 =
(2.3)^3 V_1. And you can compute the ratio of the volumes from there. DO
the same thing with the areas,etc....
Good luck with it and come back to me with particular questions if you
are still stumped. Talk with your peeps too...work together.
Ciao,
-Dr. C.
======================== Sept. 5 ==============================
Q: Hey Dr. Crescimanno, I have no clue how to go about 7 or 8 on
homework one. Let me know if you could give me a couple pointers.
Thanks, XXXXXXXXXXXXXXXXX
Dear XXXXXXXXXXXXXXxx,
For 7, start with writing down the volume of a cyclinder in temrs of
the height and the radius. Then, comvert your gallons into liters. From
there convert the liters into m^3 (recall that there are 1000 l in a
m^3).
Then set the volume you find = pi r^2 (the value given for height in
meters)
Dividing both sides by pi and (the value given for height in meters)
you can isolate r by taking the square root! Then double it and you've
got the diameter.
FOR 8: You need to find the volume in m^3 of a box whose lengths are
given...but they are given in ft. SO, convert eash side to meters length
first, then multiply! Viola, you'll get the volume in m^3. For part (b)
use the fact that the mass is the density times the volume, but again
you need to put all quantities in the same unit. I' do this by convertin
the m^3 to cm^3, computing the mass by M=density x volume, and then
converting g to Kg.