Homework Statement
First of all, there is an an attachment called EXPLANATION which shows the situation and what I have done so far.
So we have got some circuits which are made of triangles (each triangle is made of three resistors (resistors here are shown as rectangles)). The resistance...
Thanks for answers.
I was really talking about a little bit different way for solving this kind of problems.
For example, please have a look at this picture:
http://img340.imageshack.us/my.php?image=copyofhexaoe6.jpg
Hexagonal circuit has got a vertical symmetry axis, so the...
Homework Statement
So, first of all, here is a drawing of a circuit:
http://img253.imageshack.us/my.php?image=hexabj4.jpg
The resistance of each hexagon wire is r.
I need to find the resistance of this circuit when it is connected to the source with points A and B.
I know that in...
Homework Statement
First here's the drawing which shows the situation:
http://img81.imageshack.us/my.php?image=phyxt3.jpg
So there is 1 metre length and 2 millimetres diameter glass pipe which is bent. The angle ABC is equal to 90 degrees. The part of the pipe ADB is horizontal and the...
Homework Statement
A spring (which tension is k) is connected with a body (which mass is m). The whole system is in viscous liquid. In this liquid frictional force is proportional to speed: F = -C*v. With what C value the oscillation won't happen?
The Attempt at a Solution
The...
Homework Statement
There is a ring which radius is R. A little ball moves inside this ring. Ring's plane is perpendicular to the surface of ground. When a ball is moving inside a ring (ring is in quiet), the ball reaches a height which is equal to R/2.
The ring starts to move upright with a...
Homework Statement
Two balls go vis-a-vis (each of them speed is v) and strike. Hit is absolutely elastic. After the hit, one of the balls changes his motion direction 30 degrees. I need to find the direction of the other ball and both ball speeds after the hit.
The Attempt at a Solution...
Thanks for explanation. But could anyone give a suggestion about counting horizontal component of the ball's acceleration. And I have no idea how this tangential acceleration interrelates with centripetal acceleration.
Thanks for help. But if I just use the acceleration equation and multiply it by the mass of the bullet, I get the answer: mv^2/(2*l). And in my solution there is an answer mv^2/(4*l), so twice less. I think that this happens because the speed of the bullet is not steady. So the recoil force is...
Homework Statement
There is a gun which mass is M = 4 kg. The length of the gun's barrel is l = 50 cm. I need to find the average recoil force while shooting the bullet which mass is m = 5g. The speed of bullet when it leaves the gun's barrel is v = 930 m/s.
The Attempt at a Solution...
Homework Statement
Here is the drawing which shows the situation:
http://img260.imageshack.us/my.php?image=monkeygn4.jpg
The disc is weightless. There is a rope which is rolled over the disc. A monkey is fastened at the point A. At the point B there is a body bound to rope. The mass of...
Homework Statement
Mass m ball hangs on the L length thread. This system is turned up by angle alfa from the vertical. What is the stretch force when the ball passes the state of balance (where ball's kinetic energy is the biggest)?
The Attempt at a Solution
At the alpha position...
Homework Statement
If vitreous bottle is full of water and we strike with a palm from the top to the bottleneck, we can knock out the bottom of the bottle. Why? How to evaluate the force which knocks out the bottom of the bottle?
The Attempt at a Solution
Because water has...
Well does this mean that the right ball gets some rotational kinetic energy because it rotates around the left ball (in my solution this energy is not counted) and the left ball doesn't get any rotational kinetic energy because it is located at the rotation centre? Maybe then I should use moment...
Homework Statement
Here is the drawing which shows the situation:
http://img507.imageshack.us/my.php?image=drawingae3.jpg
The mass of each ball is equal to m. A rod which connects the balls is weightless. A vertical wall affects a ball which is below with force F. I need to find this...
So here are these four mechanics problems. Could anyone help with them because I am quite new to the whole physics world :)
Homework Statement
1) Boat's engine during 1 second can give speed v to L litres of water. What is the maximum speed of boat, if its mass is equal to M?
Homework...