Answer:
The minimum difference between the lengths of the two tubes should be 0.385 meters.
Explanation:
As we known that for any two waves to arrive in phase at any point the difference in the path traveled by the waves should be an integral multiple of the wavelength of the wave.
Mathematically we can write:
For the given wave we have
Applying values we get
Thus the minimum difference in the lengths of the tubes can be obtained by putting the value of n = 1
Answer:
It is called force of friction
Explanation:
The force of friction is a force that acts between two objects whose surfaces are in contact with each other.
Consider the typical case of an object sliding along a certain surface. There are two types of frictions:
- Static friction: this is the force of friction that acts when the object is not in motion yet. If you push the object forward with a force F, the object will not move immediately, but it will "oppose" to this motion with a force of static friction exactly equal to the push applied:
However, this force of static friction has a maximum value, which is given by
where
is the coefficient of static friction
N is the normal reaction exerted by the surface on the object
So, when becomes greater than
, the static friction is no longer able to balance the push applied, and the object will start sliding forward.
- Kinetic friction: this is the force of friction that acts when the object is already in motion. Its magnitude is given by
where
is the coefficient of kinetic friction, and its value is generally smaller than
. The direction of this force is also opposite to the direction of motion of the object.
Friction:
Friction is the resistive force that acts on the body in a direction opposite to the direction of motion of the same object.
Laws of friction:
1. The frictional force acting on the object is proportional to the normal force acting on the object.
For example, if the object of mass m is moving along the horizontal surface, the normal force acting on the object is mg.
Thus, the frictional force acting on the object is,
where F_N is the normal force acting on the object,
The diagrammatic representation of the frictional force acting on the object is,
2. The frictional force acting on the object depends upon the nature of the surface in contact with the object.
3. The frictional force does not depend upon the area of contact of an object with the surface.
4. The kinetic friction acting on the object is independent of the velocity of the object.
5. The coefficient of static friction is more than the coefficient of kinetic friction.
Two factors on which the frictional force depends are:
1. The frictional force depends on the adhesion between the two bodies in contact.
2. The frictional force acting on the depends upon the roughness of the surface on which the object is moving.
