# Recent content by abrowaqas

1. ### Why Groundwire at the Centre of Electricity pylon?

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...
2. ### PF is getting a face lift!

Way to go ....
3. ### 2y'-(x/y)+x^3 cosy = 0 solve?

Give me some hint ... I have also tried Cauchy and legendre methods as well ... But no one works here
4. ### 2y'-(x/y)+x^3 cosy = 0 solve?

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...
5. ### The value of spring constant in Mass spring system in an elevator

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...
6. ### Bernoulli principle or due to Viscosity?

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...
7. ### Bernoulli principle or due to Viscosity?

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 .

9. ### Law of conservation of momentum problem?

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...
10. ### Amount of Energy from Bullet fired from different weapon

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.
11. ### Law of conservation of momentum problem?

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...
12. ### Newton's Third law of motion problem.

then Doc Al how will i find the net force.. will it be Fnet = 20+10 = 30N ... what i do next?
13. ### Newton's Third law of motion problem.

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...
14. ### Calculate the work done in Rectangle?

thanks tiny-tim i got the answer... the complete answer is here .. http://cas.umkc.edu/physics/wrobel/phy240/Homework%20%205.pdf
15. ### Calculate the work done in Rectangle?

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 | | |...