This is still confusing me..
The equation represents the difference quotient
f(2+h)− f(2) /h
it represents the slope of the secant line through the points (2, f (2)) and
(2+h, f(2+h)) on the curve.
But i used this equation to find the DQ = -h+1 in the first place - feels like I am going...
Thank you Ray, I am a mature age student trying to nut things out for myself, I don't always have access to teachers, tutors etc - so its a challenge most of the time.
I appreciate the response.
Regards
Ray
I appreciate your comments. However your reply is bordering on "well aren't you an idiot" I have used this forum for a few years now, and never once have I received a reply like this.
Not everyone fully understands calculus as you do - Just a simple " did you realize that you have...
Homework Statement
Original function f(x) = -x^2+5x-2
I have calculated the difference quotient as -2x-h+5
Then use difference quotient to calculate the average rate of change:
for the following x=2 and x=2+h
I need this to go on to the next part of the question and i wanted to ensure...
Homework Statement
Hi there
I need assistance with two graphs that are causing me some problems
y=e(^-2x)(-1) and y=ln(x-2)+1
Homework Equations
I just need some guidence as to where to start - starting with a table - what range is approriate?
The Attempt at a Solution
Stuck
Hi there
Can someone please review my work and advise.
Homework Statement
Given log(a)b=3 , use the properties of logs to evaluate
4log(a)(1/b)+2log(a)b^3
Homework Equations
I used the rules
log(a)1 = 0
log(a)(x/y) = log(a)x-log(a)y
log(a)x^m = mlog(a)x
The...
Projectile motion - urgent help needed
Homework Statement
Target is projected at an an angle to the horizontal, initial speed 4 m/s, unknown angle and unknown distance to the target. Height of the target is 0.8m.
Need to find the minimum angle.
Homework Equations
v= u+at
v =...
Homework Statement
Hi there. I have two questions and in both I believe that no photoelectrons will be emitted from the surface.
Question 1
A metal with a work function of 9 x 10^-19 J is irradiated with UV radiation of wavelength 180 mm. Will photoelectrons be emitted from the...
Hi
Homework Statement
Two points X(a,b) and Y(b,a)
Prove that the distance = sqrt2 (a-b)
Homework Equations
d = sqrt(x2-x1)^2 + (y2-y1)^2)
The Attempt at a Solution
I have drilled it down to
(sqrt 2b^2+2a^2-4ba) but unable to drill it down to sqrt2 (a-b)
Help...
Homework Statement
Describe with the aid of diagrams how the back emf and induced current vary in a single-coil DC motor over one full rotation of the armature.
Give particular attention to the rate of change of flux in the coil and to the direction(s) of the DC and induced current...
Hi there, and help!
I have been attempting to nut this out and could use some guidance.
I think that I have the equation right now E(max) = 2 x n (turns) x B(in tesla)x L x v sin (theta).
Based on the info already available (see previous post) the max voltage is 1000 V.
Can someone please...
I think I have worked it out, can someone please confirm.
10 Hertz converted to radians is 62.83, therefore my volts would drop to 314 V
and minumum - if e = 0, then the minimum voltage should be 0.
Cheers
Homework Statement
Hi there, motor and generator gurus
Suppose a generator has the following specifications, and the rotor turns with frequency 10 Hz. Determine the maximum and minimum value of the voltage generated, using the formula: ε = Βlv
n = 1000 loops = 1000
B = 10 Tesla
I...
Homework Statement
Using the domain 0 < x < pi sketch the two functions y=2sin(x/3) and y = 2x/pi on the same axes. Find the area
Homework Equations
The Attempt at a Solution
I have sketch the graphs. And attached my working so far - can someone confirm my workings so far...
Really sorry,
If x = 12.4 Find the value of ... correct to two sig fgures
8^(4x/3) (divided by sign) log(base 10 subscript) (5x-3/x^0) - this is exactly how the question is written.
x to the 0 power is 1 so log(base10)(5x-3/1) = log 59
8 to the power of 4x/3 if you substitute 12.4 into...
Hi Mark
For this question - I need to substitute 12.4 into all x values.
(5x-3/x to the power 0) so if you substitute 12.4 into the x in this part of the equation (12.4^0), yes, you will get (5(12.4)/1).
Is a substitution question.
I don't yet understand how to add the Maths chararcters...
Homework Statement
Greetings - can someone please check my work, many thanks
Homework Equations
If x = 12.4 Find the value of ... correct to two sig fgures
8^(4x/3) / log(base 10) (5x-3/x^0)
The Attempt at a Solution
= 8^(16 8/15) / log(base 10) (5(12.4)-3 / 1)
= 4.8 x 10^14 (via...
I have a further question about the efficiency calculation - to ensure that I get Watts for both input and output - can I convert VA to the following.
A small transformer used to power a laptop computer has the following characteristics printed on it:
• input AC 220 V, 50 Hz, 15 VA (Does...
Hi there
Many thanks, can you advise on how to set the calculation out.
Im confused about the 15VA part of the question can I use 15 VA in the equation or do I need to convert it to another unit type?? and also determining a value for the efficiency, how can that be done?
Cheers P
Greetings physics gurus
Im getting bogged down on conversion of the VA to A
Homework Statement
A small transformer used to power a laptop computer has the following characteristics printed on it:
• input AC 220 V, 50 Hz, 15 VA.
• output DC 5.0 V, 1.0 A.
Is this transformer...
Hi physics gurus
Homework Statement
What should the primary voltage be changed to in order to produce a secondary current of 10 A, given that the V / I ratios for the coils do not change?
Current ratios that I have calculated so far are as follows:
Np (200) Vp (1200) Is (15)...
\pi\int_a^b\left(f(x)\right)^2dx
y^2 = x and line y = 3
becomes y^4
= pi [y^5/5] 3 to 0
= pi [243/5]
Example
http://www.intmath.com/Applications-integration/4_Volume-solid-revolution.php
Cheers P
Homework Statement
Find the area enclosed by the y axis, the line y = 3 and the curve x = y^2
Homework Equations
[/b]3. The Attempt at a Solution [/b]
Area = \int 3 to 0 y^2.dy
= (1/3 y^3) 3 to 0
= (1/3 x 27)
= 9 sq units...
Im finding the rational functions diffcult for some reason, sorry just not getting it at the moment.
Many thanks, I will try and nut it myself. Cheers P
Part b)
I use the f '(x) to find the turning point and determine their nature.
I think that the second derivative is - (2x/(x^2-1) or - (2x/(x-1)^2(x+1)2
Therefore the stationary points where dy/dx = 0 ie x = +1 and -1
Therefore when x = +1 y + 0 and when x = -1 y = 0...
Hi there
I have a Rational function y = 1 / x^2-1 . I have a good idea what the graph looks it, it will have vertical asymptotes at -1 and 1 and I can work out the y intercept (-1 concave down). However I'm not sure about the other parts to the question.
Homework Statement
dy/dx...
Hi AM
Thank you both for your asistance - depending on the number of figures used - you could end up with 7.07 rounding or 7.38 years (7.38) which is the same as part b)
(c) How much time has passed on Earth’s clock, as seen from the spacecraft ?
How do you tell which is the most...
The question is as stated no additional information.
Formula comes from
1. Applying the conservation of momentum to this collision KVi - vi = KVf + vf
2. Applying the conservation of kinetic energy KVi^2 + vi^2 = KVf^2 + vf^2
Solving equations simultaneously for vf leads to the...