Question

please solve this dimension related question​

Answer 1

Answer:

20 %. Ans.

Explanation:

I think it helps you a lot

Answer 2

Question:

A momentum of an object is increased by 10%. Then it's K.E will increase by?

Answer:

$\bigstar{\bold{Option\:3:21\%}}$

Explanation:

$\Large{\underline{\underline{\bf{Given:}}}}$

• Momentum of an object increased by 10%

$\Large{\underline{\underline{\bf{To\:Find:}}}}$

• Increase in K.E

$\Large{\underline{\underline{\bf{Solution:}}}}$

➸ Kinetic energy is given by the equation

    K.E = p²/2m -------equation 1

   where p is the momentum and m is the mass of the body.

➸ Initial momentum = p

➸ Final momentum = p + (10/100)×p

    Final momentum = p + 0.1 p

   Final momentum (p₁) = 1.1 p

➸ Put this in the equation for kinetic energy

➸ K.E = (p₁)²/2m

    K.E₁ = (1.1p²)/2m

    K.E₁ = 1.21 (p²/2m)

➸ From the first equation this part is given by the initial K.E

    K.E₁ = 1.21 K.E

➸ Percentage change in K.E is given by

    ΔK.E = K.E₁ - K.E/K.E × 100

➸ Substituting the given datas we get,

  ΔK.E = 1.21 K.E - K.E/K.E × 100

  ΔK.E = 0.21 × 100

  ΔK.E = 21%

$\boxed{\bold{Increase\:in\:K.E=21\%}}$

$\Large{\underline{\underline{\bf{Notes:}}}}$

➺ K.E is defined as the energy possessed by a body due to its virtue of motion

➺ K.E = 1/2 × m × v²

➺ K.E = p²/2m