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In measurement of a set, accuracy refers to closeness of the measurements to a specific value, while precision refers to the closeness of the measurements to each other. Both accuracy and precision reflect how close a measurement is to an actual value, but accuracy reflects how close a measurement is to a known or accepted value, while precision reflects how reproducible measurements are, even if they are far from the accepted value.
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A steradian is the SI unit of solid angle.It can be defined as the solid angle substended at a center of an unit,sphere by a unit area on its surface.For a general sphere of radius r, any portion on its surface with area A=r2
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Angular momentum is the property of any rotating object given by moment of inertia times angular velocity.
It is measured using SI base units: Kg.m2.s-1
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The velocity of an object under motion at a specific point of time.
The instantaneous velocity formula is given by
Vi =limΔt→0 ds/dt
Where,
- Δt is the small time interval.
- Vi is the instantaneous velocity.
- s is the displacement.
- t is the time.
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The property of a body by virtue of which the body tries to regain its original shape after the removal of deforming force, is called as Elasticity.
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Yogita Ingle 5 years, 7 months ago
A simple pendulum is just a pendulum made out of a small object attached to a light string. Ideally, it is a “point” particle attached to a massless string which is fixed to a pivot point. If the pendulum is displaced from equilibrium, it swings back and forth, and its motion is periodic.
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The sum of pressure energy , kinetic energy and potential energy of liquid remains constant
Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy.
Derivation :
Let the velocity, pressure and area of a fluid column at a point A be v₁, p and A₂ and at another point B be v₂, p₂, p₂ and A₂ .
Let the volume that is bounded by A and B be moved to M and N .
let AM = L₁ and BN = L₂ .
Now if we can compress the fluid then we have,
A₁L₁ = A₂L₂
Net work done per volume = p₂ - p₁
Kinetic energy per volume = 1/2 ρ v²
Kinetic energy gained per volume = 1/2 ρ (v₂² - v₁²)
Potential energy gained per volume = ρ g(h₂ - h₁)
Now ,
p₁ - p₂ = 1/2 ρ (v₂² - v₁²) + ρ g(h₂ - h₁)
p₁ - p₂ = 1/2 ρ v₂² - 1/2 ρ v₁² + ρ g h₂ - ρ g h₁
p₁ + 1/2 ρ v₁² + ρ g h₁ = p₂ + 1/2 ρ v₂² + ρ g h₂
p + 1/2 ρ v + ρ g h = constant
Applications :
The top of the airplane wing is a little curved and the bottom is completely flat. But air travels across both parts of the wings simultaneously in the sky.
The entire pitch of the baseball is working on the principle of Bernoulli’s theorem. The stitches of the ball can be seen forming a curve which makes it necessary for the pitcher to grip the ball’s seams.
Mr. Singh 5 years, 7 months ago
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Priyanshu Kumar 5 years, 7 months ago
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