hey guys, i'm in the middle for revising for a dynamics paper in January. I'm in the middle of a 1st year BSc Physics degree. Looking through some past papers, there are questions that i can do, and there are questions that i am unable to do. These are usually question where you have to derive...
hey guys, just wanted to know, in the graph of the OTTO cycle in the link
http://www.qrg.northwestern.edu/ther...Pv-diagram.gif [Broken]
are stage (2-3) and (1-4) adiabatic or not, if so why are they
the reason i ask is that i have a graph showing that these stages are adiabatic...
hey guys, just wanted to know, in the graph of the OTTO cycle in the link
http://www.qrg.northwestern.edu/thermo/design-library/otto/Otto-Pv-diagram.gif
are stage (2-3) and (1-4) adiabatic or not, if so why are they
the reason i ask is that i have a graph showing that these stages are...
question
a rectangular plot of land requires fencing on all 4 sides. two opposite sides will use heavy duty fencing at £6/metre, whilst the other tow sides will use standard fencing at £3/metre. if the farmer buying the fencing has £5000 to spend, what is the maximum area he can enclose...
1. ln (x2 / y2)
= log (A / B) = logA-logB
= logx2-logy2
= 2logx - 2logy
(is this correct)
2. can this expression be split into seperate log functions and numbers, is this question the answer
log(2x + 3y) = log(2x + 3y)
(is this correct)
given a distance s = 8.6m, time t = 2s, and a mass = 1.01kg, evaulate the expression to a physically appropriate accuracy?
m3 = 1.013 = 3.03kg
is this correct
are these dimensional analysis questions correct
A = area
V = volume
v = speed
p = density
1. VA / v = L3 L2 L-1 T-1 = L4T-1
2. V2/3 A = (LT-1)2/3 L2 = L2/3 T-2/3 x L2 = L10/3T-2/3
3. 3A3 + 2V2 = A3 = L6
V2 = (L/T)2 = L2T-2 = L4T-2
are these correct
a gas contains 2 kinds of atoms 4x105atoms of type A and 8x105 atoms of type B. it is known that the mass of type A atoms is 5x10-26kg and the mass of the gas is 2.8x10-20kg. what is the mass of type B atom?
answer;
2.8x10-20kg - 5x10-26kg = 2.8x10-20kg - 0.00005x10-20 = 2.799995x10-20kg...
questions
3.
A substance consists of equal numbers of tow kinds of atoms, with masses m1 and m2 respectively.
a) what is the mass of the substance is 2x106 atoms of each kind are present, where m1 = 3.4x10-26kg and m2 = 1.6x10-26kg?
answer;
3.4x10-26kg + 1.6x10-26kg = 5x10-26 x 2x106 =...
Differentiation problem and finding maximum, need helping :)?
have a few problems with these questions, can you help :)
Using differentiation, find the MAXIMUM value of the following functions?
1. f(x) = x2 / 4 + 4 / x
2. f(x) = xe-2x2
3. f(x) = sqrt(x - n) / x ; n>0
hope you guys...
Indefinate integration problem !!
find the following indefinate integrals?
a) ∫ x / 1 + x2
b) ∫ 1 / 1 - x2
c) ∫ 3x / (2x2 - 3)4
can you help me please !!!
Indefinate integration problems!!!
find the following indefinate integrals?
d) ∫ 6x2 / sqrt(2x3 + 9)
e) ∫ x sqrt(1 - x2
f) ∫ 4 / (x + 2)(x + 3)
can you help me answer these please
maximum values for differentiation :(
have a few problems with these questions, can you help :)
using differentiation, find the maximum value of the following functions?
1. f(x) = -x2 + x
2. f(x) = lnx - x
3. f(x) = -x2 + 2x2
4. f(x) = x2/4 + 4/x
5. f(x) = xe-2x2
6. f(x) = sqrt(x -...
have a few problems with these questions, can you help :)
1. f(x) = -x2 + x
2. f(x) = lnx - x
3. f(x) = -x4 + 2x2
4. f(x) = x2/4 + 4/x
5. f(x) = xe-2x2
6. f(x) = sqrt(x - n)/x ; n>0
hope you guys can help !
in plan view, the shoreline of a bay may be approximated by a curve f(x) = -x2 + 2x between one headland at x = 0 and another at x = 1km, where (f) is also measured in km. at low tide, the edge of the sea just reaches each headland, following a straight line between them. calculate in km2 the...
if a spaceship accelerates, from restat time t = 0, at a rate of 2t / sqrt(1 + t^2) m/s at time t, calculate in years to 1 significant figure how long it would take to reach the speed of light?
my attempt
speed of light = 3.0 x 10^8 m/s
integrate the rate function 2t / sqrt(1 + t^2) from...
the height h(x) in meters above the ground of a parachute varies with her horizontal distplacement x in meters from a landing target on the ground as h(x) = 50sin^-1 (0.1x). what is the rate of change of h with respect to x at x = 6m?
i was wondering of someone could help me with this question :)
how do i go about answering this question guys, send me in the right direction please :)
"when a diode allows a positive current to flow it has a resistance of 0.5kohms. It does not allow negative flow, i.e. the resistance is infinate. using ohms law, sketch a graph of current I against...
hey guys, stuck on a few question, but dnt tell me the answer, direct me please :)
how do i find the intercepts for;
1. y = 1 / x -1
2. y = 2 / x + 1
3. y = 3 / 2x + 3
cheers guys :):)
hey guys, could u use the quadratic formula;
x = -b +/- sqrt (-b2 - 4ac)
2a
for the following questions;
y = 4x2 - x
y = 4x2 -1
y = x2 + 4
and
y = -2x2 + 4x
i ask this as there is no value for (c)...
if a spaceship accelerates, from rest at time t=0, at a rate of 2t / sqrt(1 + t2) ms-2 at time t, calculate in years to 1 significant figure how long it would take to reach the speed of light 3x108 ms-1?
i got an answer of 5 years, is this correct, but i have made a mess of my workings, what...
i need help with the following quesitons;
a) log_3 27x^2
b) ln (x^2 / y^2)
c) ln (xe^x)
d) log (2x + 3y)
i dont mind if you could direct me in the right direction and i will do my best to go from there :)
USING THE RULES FOR LOGS, SPLIT THE FOLLOWING UP INTO SEPERATE...
hey guys, i have a question, then i will show my solution, is there any chance you guys could help me find an easier way to get to the answer, cheers
question:
log_3 3x
answer:
log_a (yx) = log_a (y) + log_a (x)
log_3 (3) + log_3 (x)
log_a (y) = x -> y = a^x -> log_a (a) = 1...
it is suspected that cells in a sample are dividing so that the number of cells present at any one time t (measured in seconds) is growing exponentially according to the relationship y = 64 x 2^2t. it would be hard to check this relationship accurately by plotting measurements of y against t, so...