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3 years ago

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The three classes of rocks are sedimentary, metamorphic, and igneous. How are rocks classified into one of these three groups? A

. According to the type of minerals present in the rock B. According to how many times they have been through the rock cycle C. According to the method of their formation D. According to the amount of weathering they have endured Rese

2 answers:

snow_tiger [21]3 years ago

6 0

the answer is C. according to the method of their information

KIM [24]3 years ago

3 0

Hello,

Here is your answer:

The proper answer to this question is option C "<span>According to the method of their formation".

Here is how:

Scientist's figure out what type it is due to the method they use to figure out what type of rock it is.

Your answer is C.

If you need anymore help feel free to ask me!

Hope this helps! </span>

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In creating his definition of horsepower, James Watt, the inventor of the steam engine, calculated the power output of a horse o

Studentka2010 [4]

Answer:

Part a)

$F = 182.3 Lb$

Part b)

$P = 0.55 HP$

Explanation:

Diameter of the circle = 24 ft

Diameter = 731.52 cm = 7.3152 m

now the horse complete 144 trips in one hour

so time to complete one trip is given as

$t = \frac{3600}{144} s$

$t = 25 s$

now the speed of the horse is given as

$v = \frac{2\pi r}{t}$

$v = \frac{\pi(7.3152)}{25}$

$v = 0.92 m/s$

Part a)

Now we know that the power is defined as rate of work done

it is given as

$P = F v$

$746 = F(0.92)$

$F = 810.9 N$

$F = 182.3 Lb$

Part b)

Work done to climb up to 3 m height is given by

$W = mgh$

now we have

$Power = \frac{Work}{time}$

$P = \frac{mgh}{t}$

$P = \frac{(70kg)(9.81)(3)}{5.0s}$

$P = 412.02 Watt$

now we know that 1 HP = 746 Watt

so we have

$P = \frac{412}{746} = 0.55 HP$

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3 years ago

Which type of mixture is air explain

igor_vitrenko [27]

Answer:Three elements make up over 99.9 percent of the composition of dry air: these are nitrogen, oxygen, and argon.

Explanation:

7 0

3 years ago

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A roller coaster accelerates from 0 m/s to 25 m/s in 5 seconds. Determine the acceleration of the roller coaster.

pashok25 [27]

Acceleration = change of velocity / time taken = 25/5 = 5 m/s/s

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4 years ago

true or false the speed of sound traveling through steel is much less than the speed of sound traveling through air

Misha Larkins [42]

This is false. Sound travels faster through steel. That is why you can see people in movies putting their ear on the railroads to see whether a train is coming. That is because they can't hear it through air, but the sound travels through the steel.

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3 years ago

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A convex refracting surface has a radius of 12 cm. Light is incident in air (n = 1) and refracted into a medium with an index of

OLga [1]

Answer:

<h2>36cm from the surface</h2>

Explanation:

Equation of refraction of a lens is expression according to the formula given below;

$\dfrac{n_2}{v} = \dfrac{n_1}{u}= \dfrac{n_2-n_1}{R}$

R is the radius of curvature of the convex refracting surface = 12cm

v is the image distance from the refracting surface

u is the object distance from the refracting surface

n₁ and n₂ are the refractive indices of air and the medium respectively

Given parameters

R = 12 cm

u = $\infty$ (since light incident is parallel to the axis)

n₁ = 1

n₂ = 1.5

Required

<em>focus point of the light that is incident and parallel to the central axis (v)</em>

<em />

Substituting this values into the given formula we will have;

$\dfrac{1.5}{v} - \dfrac{1}{\infty}= \dfrac{1.5-1}{12}\\\\\dfrac{1.5}{v} -0= \dfrac{0.5}{12}\\\\\dfrac{1.5}{v}= \dfrac{0.5}{12}\\\\$

Cross multiply

$1.5*12 = 0.5*v\\ \\18 = 0.5v\\\\v = \frac{18}{0.5}\\ \\v = 36cm$

Hence Light incident parallel to the central axis is focused at a point 36cm from the surface

6 0

3 years ago