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3 years ago

Which equation contains only scalar quantities

Physics

1 answer:

sergejj [24]3 years ago

7 0

Answer:

B. power = work /time has only scalar quantities

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What happens when a mixture is formed?

Darina [25.2K]

Physical properties change

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Consider An equilateral prism made of silica glass with n=1.5. Light is incident on one face at an angle of π/4 with respect to

erastovalidia [21]

Answer:

The angle at which the light emerges from the opposite face of the prism with respect to the original incident beam is 53.3°.

Explanation:

Given that,

Angle $\theta=\dfrac{\pi}{4}$

$\theta=45$

Refractive index n=1.5

For the refraction at the first surface

We need to calculate the angle

Using formula of refraction

$n_{a}\sin\theta_{1}=n_{g}\sin\theta_{2}$

Put the value into the formula

$1\sin\dfrac{\pi}{4}=1.5\sin\theta_{2}$

$\sin\theta_{2}=\dfrac{1\times\sin45}{1.5}$

$\sin\theta_{2}=0.46520$

$\theta_{2}=\sin^{-1}(0.46520)$

$\theta_{2}=27.7^{\circ}$

We need to calculate the angle on incidence at the second surface

$(90-\theta_{2})+(90-\theta_{3})+A=180$

$\theta_{3}=A-\theta_{2}$

Put the value into the formula

$\theta_{3}=60-27.7$

$\theta_{3}=32.3$

For the refraction at the second surface,

We need to calculate the angle at which the light emerges from the opposite face of the prism with respect to the original incident beam direction

Using formula of refraction

$n_{g}\sin\theta_{3}=n_{a}\sin\theta_{4}$

Put the value into the formula

$1.5\sin32.3=1\times\sin\theta_{4}$

$\theta=\sin^{-1}(\dfrac{1.5\sin32.3}{1})$

$\theta=53.3^{\circ}$

The angle is 53.3° from the original

Hence, The angle at which the light emerges from the opposite face of the prism with respect to the original incident beam is 53.3°.

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4 years ago

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1 second What is the frequency of this wave? O 1 02 O 3 O4

ankoles [38]

Answer:

Option (1) f = 1

Explanation:

Formula for Frequency (F) = 1/t where t = Time in seconds.

F = 1/1

F = 1 hz ( hz or hertz is the unit for Frequency ).

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2 years ago

Friction occurs when microscopic hills and valleys stick together true or false

Reika [66]

Answer:

true

Explanation:

Friction occurs because no surface is perfectly smooth. Rougher surfaces have more friction between them. Heavier objects also have more friction because they press together with greater force. Friction produces heat because it causes the molecules on rubbing surfaces to move faster and have more energy.

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If the net external force acting on a system is zero , then the total momentum of the system is zero

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If net external force acting on the system is zero, momentum is conserved. That means, initial and final momentum are same → total momentum of the system is zero.

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