Frictional is the consequence of the surface irregularities of any two surfaces. Though the surface of an object seems to be smooth apparently, there are high and low grooves on it in fact. When an object moves on another object, the grooves of both the surfaces catch onto one another and this is why frictional … Read more
Why we do not feel the atmospheric pressure? The atmosphere for its weight applies force on the earth’s surface and the amount of force acting perpendicularly on per unit surface area of the earth is called atmospheric pressure. As the altitude increase, the length of the air column decreases. So, the weight it applies to … Read more
Weight is a force that is a vector. So, it has a magnitude and direction. However, mass is a scalar. Weight and mass are related to one another, but they are not the same quantity. Mass is multiplied by the acceleration due to gravity to calculate the weight of an object. Acceleration due to gravity … Read more
If the acceleration of a body 5 ms-2 it means that the body is moving with a uniform velocity of 5 ms-1 each second; that is, its velocity is increasing every second at a rate of 5 ms-1.
The rate of change of velocity with the time that is the change of velocity is known as acceleration. It means to be accelerated, the magnitude or direction of the speed of a body must be changed. But if the magnitude of the velocity of a moving body remains unchanged, then the velocity of the … Read more
A body is said to be in absolute rest when it is in rest with respect to an absolute rest object. Similarly, absolute motion of a body is its motion with respect to a reference object absolutely at rest. But in this universe, it is not possible to get a reference object which is at … Read more
Ultrasound Images: about various ultrasound images for diagnostics. X-rays Modern medicine relies heavily on a variety of imaging techniques. They generate pictures of the interior of the human body for diagnostic purposes. The oldest of these imaging techniques is radiography. It generates pictures by irradiating the body with X-rays and recording the shadows of the internal … Read more
A sound wave is intense and loud if it has a large amplitude. However, the amplitude of a sound wave is hard to measure directly, and it is more convenient to reckon the intensity of a sound wave by the energy it carries. The intensity of a sound wave is defined as the energy per … Read more