Homework Statement
the pic is in the attachment. and i am supposed to find the normal force. the object is in equilibrium.The Attempt at a Solution
i tried to separate the Fg into its components but the angle is unknown. i can't seem to use any other method. force of friction is unknown and...
thanks for all the help guys. this question for some reason became an itch for me. i had to solve it. hopefully as i learn more i will be able to better grasp the concepts.
ok. i think the whole f(x) and f(1/x) thing was just confusing me. i replaced them with x and y and did it like robphy advised and got an answer that the back of the book said was correct.
2x-3y=4
2y-3x=1/4
y=(3x)/2-1/8
2x-3((3x)/2-1/8)=4
2x-(9x)/2 - 3/8=4
(4x)/2-(9x)/2=4+3/8
5x=8+6/8...
i am not sure i understand the concept of the two unknowns. i tried to do it like linear systems but failed. i went through the textbook to try and find another question like these but there are none. does anyone have a link to a good guide that will help me understand the concepts?
tried really hard to find some form of method that will help me understand but couldn't. these two question for some odd reason are placed at the end of the "introduction to functions" chapter of my precal textbook. they are not part of any homework or test or anything, i was just...
ok.
for a) i am not sure how to do it, but here is my attempt.
as far as i understand, f(x) means just plug in a value for x.
f(2) i think is just x=2
2(2)-3(1/2)=2^2
4-3/2=4
8/2-3/2 doesn't equal 4.
so as you can see i am lost.
b)same thing for be, just put a value given for n...
Homework Statement
A)If 2f(x) - 3f(1/x) = x^2 , determine f(2).
B)Let f be a function defined by f(n)=2f(n-1) + 3f(n-2), where f(1)=1 and f(2)=2. Determine f(5).
The attempt at a solution
I tried to plug in the 2 into all the x's but got the wrong answer. would really appreciate...
I have trouble trying to figure out what happens to this reaction:
NaOH(s)+H2O(l)->
my first thought was that maybe nothing happened but then moved on to wondering wether it ionizes. can someone explain to me what happens and maybe why it does?
ok thanks. i think i understand.
so the mass of one proton is 1.0078 and neutron is 1.0086. there are six neutrons and 6 protons. that gives us 12.098940 and since the mass of the carbon 12 is 12.0000 the mass difference is 0.098940. insert that into einstien's equation and we get...
Hey, i was ill for a few day, (damn flu) and missed some classes, am trying to catch up and need some help to understand some things.
Question:
Calculate the molar binding energy of carbon-12 nuclei.
Attempt at solution:
I don't really know where to start with this. can someone explain...
Can I get some assistance with concentration problems?
1. What mass of formaldehyde, CH20 is contained in 250 mL of 8.0 mol/L solution of formaldehyde.
I went about this with first getting the molar mass of formaldehyde; which is 30 g/mol. Then since 8.0 mole/L I divided it by 4 to get 2...
ok...i know how to find the limiting reactant but am lost as in how to find out how much is left over...
Example:
N2H4 + 7H2O2 ---> 2HNO3 + 8H2O
a) 120g of N2H2 reacts with an equal mass of H2O2. Which is the limiting reactant.
i got is done:
N2H2= M/mm=120g / 32.1 g/m = 3.74 moles...