We have noticed in various electricity pylons/towers that groundwire or shieldwire is always placed at the top and between the two conductors ?
why is that so?
If you look at the 220kV structures or 500kV structures of pylons, you will notice the groundwire is placed at the middle of...
Homework Statement
Solve the follwing differential equation
2y'-(x/y)+x^3 cosy = 0 solve?
Homework Equations
Linear Differential equation: y'+py=q
exact differential equation: Mdx+Ndy=0
The Attempt at a Solution
both of the methods i have applied .... but didnt work
later i...
A mass spring system is in elevator which moves upward with an acceleration "a" . What will be effect on the measured value of spring constant compared to its value when elevator is at rest.
Since
K= F/x
At rest F=mg
But with acceleration
F=m(g+a)
So
I think the value is...
But if we apply bernoulli's principle here: I-e
" where the pressure is high in a fluid there is low velocity and where the pressure is low in a fluid motion , velocity will be higher..
We know that at sides there is more pressure due to Adhesion and Cohesion forces hence speed is low...
Why the speed of water in the middle of the smooth flowing stream is high than its speed on the sides?
Is it due to Adhesion or cohesion forces or viscosity or Bernoulli principle holds here?
Kindly tell me exact reason .
P = momentum, m = mass and v= velocity, and P=m*v
So before the collision we have a total momentum of (65*4.9) + (88*1.2) = 424.1Kg/ms^-1
After the collision, the momentum must be 424.1. This is equal to the combined mass of the man and the boat (65+88=153kg) multiplied by the final velocity...
How we differentiate the amount of Energy of a bullet fired by a gun and a rifle with same linear velocity?
do they posses the same energy ? or rifle has more energy than gun.
Homework Statement
A man of mass 65kg is running at speed of 4.9m/s, jumps in to a rowboat of 88kg that is drifting without friction in the same direction at a speed of 1.2m/s. when the man is seated in the rowboat, what is the final velocity of the boat?
Homework Equations
Momentum...
Homework Statement
An object is free to move on a table, ex-
cept that there is a constant friction force f
that opposes the motion of the object when
it moves. If a force of 10 N pulls the object
across the table, the acceleration is 2 m/s2. If
a force of 20 N pulls the object across the...
Homework Statement
A force acting on a particle moving in XY plane is given by F= 2y i + x^2 j . particle moves from origin to a final position having coordinates (x,y)=(5,5). calculate the work done by force F along
B_____________C
| |
|...
DaleSpam..
i got the point of your questions. but u quote examples both are related to the circular motion ...
what about the work in the rectilinear motion ?
We know that work is the dot product between force and displacement .. so dot product always gives scalar (horizontal projection etc) hence work is a scalar quantity?
I want the reason behind it.....
we always do work in specific direction..
suppose a man in appliying force at the...
I think all members are not taking this question seriously..
well this question appeared in Pakistan's superior examination for recruitment in March 2012.
this is the link of that paper...
what if Jacobi Method's condition did not meet?
Homework Statement
solve by Jacobi Method upto four decimal places
8x+y-z= 8
2x+y+9z= 12
x-8y+12z = 35
Homework Equations
The Attempt at a Solution
since the condition of convergence of jacobi method is
|A1| > |B1|+|C1|...
Homework Statement
If f(x) = x^3,
show that
f(a,b,c) = a+b+c
Homework Equations
I have given exam last week. and i am still searching for this question .. what this is about. is it from Tensor coordinate transformation or some numerical analysis involve here.
kindly somebody...
Homework Statement
Solve the following differential equation
y'''-3y''+2y' = e^x/(1+e^(-x))
Homework Equations
The Attempt at a Solution
first i find the complementary function i-e
Yc= C1 e^x + C2 e^(1+√3)x + C3 (1-√3)x
now i started to find particular integral by
Yp =...
so that means my method is correct?
but someone says
If the problem really is to find a "volume", it should read ∫ ∫ |xy| dA because the integrand is not positive everywhere on the region given.
Can't be sure, but that's probably not what the author intended. He just wants you to integrate...
Homework Statement
Find the Volume
∫∫ xy DA
where R is the region bounded by by the line y=x-1 and the parabola y^2=2x+6.
Homework Equations
∫∫ xy dx dy
The Attempt at a Solution
first i found the intersection of the above equations . which is (5,4) to (-1,-2) . then i...
Homework Statement
Evaluate the following line integral
∫y^2 dx + x dy where C is the line segment joining the points (-5,-3) to (0,2) and is the arc of the parabola x= 4-y^2
Homework Equations
Green's Theorem
∫ Mdx + Ndy = ∫∫ (∂N/∂x - ∂M/∂y ) dy dx
The Attempt at a...
Thanks for explanation.. i got it... i have given exam last last friday. i have written the same answer to the question stated below
Elaborate the Hybrid Nature of Operator NABLA ?
what this link say about dual nature of nabla? can anybody explain...
I didn't get the concept of dual or hybrid nature of nabla? I-e vector differential operator .. Is it means that nabla can produce a vector from scalar field (gradient) and scalar from vector field(divergence) ? What's the concept of Nabla's Dual nature ? Please explain..