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3 years ago

8

_______________ involves removing the top layer of earth, mining the coal, and then replacing the earth back on the surface

1 answer:

aniked [119]3 years ago

5 0

Surface mining is the method of removing the overburden parts of the earth which are the earth and rocks. It also involves removal and loading out of the coal, and then placing back the collected earth back into a surface once again. It's also a method that uses equipment or explosives.

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Calculate the potential difference between points x and y

aliya0001 [1]

Answer:

4.275v

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3 years ago

Read 2 more answers

2. A Formula One race car speeds up from rest to 27.8 m/s in a distance of 25 meters.

Nadya [2.5K]

Answer:

Correct answer: a = 15.46 m/s²

Explanation:

The formula for accelerated movement with the given data is:

V² - V₀² = 2 · a · d where the initial velocity V₀ and the final V

Since the initial velocity V₀ is zero, the formula is:

V² = 2 · a · d => a = V² / (2 · d) = 27.8² / (2 · 25) = 772.84 / 50 = 15.46 m/s²

a = 15.46 m/s²

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3 years ago

A ball is thrown directly upward from a height of 3 ft with an initial velocity of 28 ft/sec. the function s(t)equalsminus16ts

borishaifa [10]

Answer:

$t = 0.875 s$

$s_{max} = 15.25 ft$

Explanation:

Position of the ball as a function of time is given as

$s(t) = s_o + v_y t + \frac{1}{2}at^2$

$s(t) = 3 + 28 t - 16 t^2$

now we know that when ball will attain maximum height then the differentiation of the position with respect to time will become zero

so we have

$\frac{ds}{dt} = 0$

$0 = 0 + 28 - 32 t$

$t = 0.875 s$

now the maximum height is given as

$s_{max} = 3 + 28(0.875) - 16(0.875)^2$

$s_{max} = 15.25 ft$

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4 years ago

What will it be the critical angle if light is incident from glass n=1.5 in to the air n=1

Alika [10]

Answer: 42°

Explanation:

1sin90 = 1.5sinθ

θ = 42°

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3 years ago

What is the correct description of lactic acid fermentation?

Nikitich [7]

An aerobic process that produces ATP from pyruvic acid<span />

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3 years ago