The distance of the principal focus from the pole is called the focal length (f). There is a relationship between these three quantities given by the mirror formula which is expressed as 1v+1u=1f. This formula is valid in all situations for all spherical mirrors for all positions of the object.

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## What are the 3 formulas in physics?

The three equations are, v = u + at. v² = u² + 2as. s = ut + ½at²

## What is the best formula in physics?

E=mc^2. For our first, we’ll take perhaps the most famous equation of all. Albert Einstein’s 1905 equation relating mass and energy is both elegant and superficially counterintuitive. It says that energy is equal to the mass of an object in its rest frame multiplied by the speed of light squared.

## What are the 4 equations of motion?

The equations are as follows: v=u+at,s=(u+v2)t,v2=u2+2as,s=ut+12at2,s=vt−12at2.

## What is current formula?

Ohm’s law relates the current flowing through a conductor to the voltage V and resistance R; that is, V = IR. An alternative statement of Ohm’s law is I = V/R.

## What is the formula of energy class 12?

The formula to determine the Kinetic energy of an object is – K.E = ½ mv² [ where,m= Mass of the object, V = The velocity of the object]. The formula to determine the Potential energy of an object is – P.E = mgh, Where m denotes the object’s mass, g denotes gravitational acceleration, and h denotes height.

## What is first law motion?

Newton’s first law: the law of inertia Newton’s first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.

## What is final speed?

A final velocity is a speed at which an object is moving after having gone through an acceleration over some time. How is final velocity calculated? Finally, velocity is calculated by adding the acceleration times time to the initial velocity.

## What is F1 F2 F3 in physics?

Formula of Resultant Force F1, F2, F3 are the three forces acting in the same direction on an object.

## What is the hardest formula?

For decades, a math puzzle has stumped the smartest mathematicians in the world. x3+y3+z3=k, with k being all the numbers from one to 100, is a Diophantine equation that’s sometimes known as “summing of three cubes.”

## Why is E mc2 so famous?

But its fame is mostly because of its association with one of the most devastating weapons produced by humans – the atomic bomb. The equation appeared in the report, prepared for the US government by physicist Henry DeWolf Smyth in 1945, on the Allied efforts to make an atomic bomb during the Manhattan project.

## What is the longest formula?

What is the longest equation in the world? According to Sciencealert, the longest math equation contains around 200 terabytes of text. Called the Boolean Pythagorean Triples problem, it was first proposed by California-based mathematician Ronald Graham, back in the 1980s.

## What is V motion physics?

They are often referred to as the SUVAT equations, where “SUVAT” is an acronym from the variables: s = displacement, u = initial velocity, v = final velocity, a = acceleration, t = time.

## Is velocity a speed?

Speed is the time rate at which an object is moving along a path, while velocity is the rate and direction of an object’s movement. Put another way, speed is a scalar value, while velocity is a vector.

## Is Ohm’s law is universal law?

No. Ohm’s law is not a universal law. This is because Ohm’s law is only applicable to ohmic conductors such as iron and copper but is not applicable to non-ohmic conductors such as semiconductors.

## What is current SI unit?

ampere. The ampere, symbol A, is the SI unit of electric current. It is defined by taking the fixed numerical value of the elementary charge e to be 1.602 176 634 x 10-19 when expressed in the unit C, which is equal to A s, where the second is defined in terms of ΔνCs. Unit of.

## What is charge SI unit?

The SI unit of electric charge is the coulomb.

## WHAT IS lens formula?

The Lens formula is applicable for convex as well as concave lenses. These lenses have negligible thickness. The formula is as follows: 1 v − 1 u = 1 f.

## What is V in lens formula?

where u is the distance of the object from the lens; v is the distance of the image from the lens and f is the focal length, i.e., the distance of the focus from the lens. N.B. other sign conventions are sometimes used in the literature. = 2 6 − 1 6 = 1 6 So v = 6 cm.

## WHAT IS lens and mirror formula?

The lens formula has a minus sign (-) between 1/v and 1/u where as the mirror formula has a plus sign (+) between 1/v and 1/u . Mirror formula : v1+u1=f1.

## What is energy SI unit and formula?

The energy stored in an object due to its position and height is known as potential energy and is given by the formula: P.E. = mgh. Unit. The SI unit of energy is Joules (J).

## What is the SI basic unit of energy?

Joule (J). This is the basic energy unit of the metric system, or in a later more comprehensive formulation, the International System of Units (SI). It is ultimately defined in terms of the meter, kilogram, and second.

## What is efficiency formula?

You can measure it by using the following formula: Efficiency = Output ÷ Input. Output (or work output) is the total amount of useful work completed without accounting for any waste and spoilage. If you want to express efficiency as a percentage, simply by multiplying the ratio by 100.

## What are the 45 formulas of trigonometry?

- sin (π/2 – A) = cos A & cos (π/2 – A) = sin A.
- sin (π/2 + A) = cos A & cos (π/2 + A) = – sin A.
- sin (3π/2 – A) = – cos A & cos (3π/2 – A) = – sin A.
- sin (3π/2 + A) = – cos A & cos (3π/2 + A) = sin A.
- sin (π – A) = sin A & cos (π – A) = – cos A.
- sin (π + A) = – sin A & cos (π + A) = – cos A.

## How are term 1 marks calculated?

CBSE marks weightage formula In the theory section, 30% weightage is given to term 1, and 70% to term 2. Equal weightage to both terms for practicals.