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Stress in Physics Stress in Physics The internal restoring force acting per unit area of cross–section of the deformed body is called stress. Stress = (Internal Restoring force/Area of cross section) = Finternal/A = Fexternal/A SI Unit : Nm–2 Dimensions : [M1 L–1 T–2] Types of stress (Stress in Physics) (a) Longitudinal Stress (b) Volume…
COP(Heat Pump)=COP(Refrigerator)+1 Heat PUmp: Heat pump is a device that transfers heat from a colder area to a hotter area by using mechanical energy, as in a refrigerator. In heat pump how much heat is rejected at higher temperature is an important quantity. Coefficient of performance of Heat Pump ⇒ ∴ ……….(1) Refrigerator:…
Difference between Heat Engine Heat Pump and Refrigerator In this article we are going to have detailed study of difference between Heat Engine Heat Pump and Refrigerator. Heat Engine: Heat engine is a device which converts heat energy into mechanical work. In heat engine how much work is extracted from a given amount of heat…
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DIMENSIONS Dimensions of a physical quantity are the powers (or exponents) to which the base quantities are raised to represent that quantity. 1. Dimensional formula :- Dimensional formula of any physical quantity is that expression which represents how and which of the base quantities are included in that quantity. It is written by…
System of Units System of Units :- A system of units is the complete set of units, both fundamental and derived, for all kinds of physical quantities. The common system of units which is used in mechanics are given below :- (a) CGS or Gaussian system In this system the fundamental quantities are…
Physical Quantities All the quantities which are used to describe the laws of physics are known as physical quantities or in other words “the quantities which can be measured are called physical quantities.” Classification of physical quantities :- Physical quantities can be classified on the following bases :- I. Based on their directional…
Newton’s Laws of Motion Newton’s Laws of Motion Newton has published three laws, which describe how forces affect motion of a body on which they act. These laws are fundamental in nature in the sense that the first law gives concept of force, inertia and the inertial frames; the second law defines…
