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3 years ago

Explain how improving the EXERGY may be as good, if not better than discovering new/coal mines ? (10 marks)

Physics

1 answer:

Reptile [31]3 years ago

3 0

Answer:

Improving energy is more good than discovering coal mines

Explanation:

It is because discovering coal mines can destroy a land by making deep holes and can even destroy some animal's habitat but by improving energy none of this will happen.

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Lesechka [4]

Answer:

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4 years ago

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A wave with a large amplitude has a lot of a.vibration b.speed c.energy

adoni [48]

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3 years ago

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What are some characteristics of an Effective Early Childhood teacher

nata0808 [166]

Answer:

Enthusiasm, patience, and the respect of differences.

Explanation:

It takes courage and time for an effective early childhood teacher to understand and appreciate what she has with the kids and to understand them and help kids with creativity and to make them feel awesome.

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3 years ago

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A step index fiber has a numerical aperture of NA = 0.1. The refractive index of its cladding is 1.465. What is the largest core

Vladimir [108]

Answer:

diameter = 9.951 × $10^{-6}$ m

Explanation:

given data

NA = 0.1

refractive index = 1.465

wavelength = 1.3 μm

to find out

What is the largest core diameter for which the fiber remains single-mode

solution

we know that for single mode v number is

V ≤ 2.405

and v = $\frac{2*\pi *r}{ wavelength} NA$

here r is radius

so we can say

$\frac{2*\pi *r}{ wavelength} NA$ = 2.405

put here value

$\frac{2*\pi *r}{1.3*10^{-6}} 0.1$ = 2.405

solve it we get r

r = 4.975979 × $x^{-6}$ m

so diameter is = 2 × 4.975979 × $10^{-6}$ m

diameter = 9.951 × $10^{-6}$ m

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3 years ago

A 2 kg blue car is moving 6 m/s to the right and collides with a 3 kg red car that is moving 2 m/s to the left. The cars collide

snow_lady [41]

Answer:

Their velocity after the collision is 1.2 m/s, to the right.

Explanation:

Given;

mass of the blue car, m₁ = 2 kg

initial velocity of the blue car, u₁ = 6 m/s

mass of the red car, m₂ = 3 kg

initial velocity of the red car, u₂ = 2 m/s

let the blue car moving to the right be in positive direction

also, let the red car moving to the left be in negative direction

Apply the principle of conservation of linear momentum for inelastic collision.

m₁u₁ - m₂u₂ = v(m₁ + m₂)

where;

v is their velocity after the collision

(2 x 6) - (3 x 2) = v(2 + 3)

12 - 6 = 5v

6 = 5v

v = 6/5

v = 1.2 m/s, to the right

Therefore, their velocity after the collision is 1.2 m/s, to the right.

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3 years ago