I am revising for my A levels and I have noticed that a common question on the paper is to define RESISTIVITY.
I have looked and looked but found no definitive description or a good definition.
I know the formula but is it right to just say that "resistivity is directly proportional to a...
Just wondering if anyone can check over my answer for a question.
Q) A 1.7kg object is swung on the end of a 0.6m string in a vertical circle. The object does one revolution every 1.1s. What is the tension in the string at the top of the circle? and the bottom?
A) m=1.79kg r=0.6m...
just a check of my work please.
I have to write an expression for the nth term of this geometric sequence.
a1=100
a2=106
a3=112.36
I've worked out the ratio to be r=1.06
I am using the formula un=ar(n-1)
so the expression i have come up with is un=100(1.06)(n-1)
Is this correct? I have...
Just a check of my work please,
The topic is series and sequence,
Question:
The sequence u1, u2, u3,..... where u1 is defined by u1=2 and Un+1 =un+4
Find the nth term, un, of the sequence.
I got the answer,
u1=-1
u2=-1+4= 3
u3= 3+4 = 7
So:
un = 4(n-1)-1
This seems to work but not sure if...
I'm pretty sure the lost volt is the resistance inside the battery. Once you work out the lost volt you can minus that from the voltage of the battery and work out the real value of V. Most questions dont include thw lost volt because it is quite small and considered negible. I think they are...
Hi guys,
Having trouble with a question
I need to know the displacment of a point on a spring at certain times.
At t=0 point p is at its maximum displacement at 2cm
point A is further down the spring at p-A = 0.4m
A transverse wave of frequency 5Hz is moving along the spring at...
simultaneous polynominals!!
stuck on this coursework question
The cubic polynominal f(x)= 4x^3+ax^2+bx+6 has a factor (x-2)
when it is divided by (x+1) it has a remainder 0f -15
find the values of a and b
I did as follows
factor (x-2)
f(-2)
4(-2)^3+a(-2)^2+b(-2)+6=0
equals 4a-2b=26...
I have been asked to draw the graph of the function f(x)= (x+3)/(x-2)
I have found where it cuts the y axis by putting x=0 but am unsure of how to find the x value.
I found the inverse of f(x)= (x+3)/(x-2) which gave me x= (y+3)/(y-2) then set y=0 which again gave me x=-3
I have checked...