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3 years ago

Which describes two minerals that have different arrangements of their atoms?

1 answer:

6 0

The best and most correct answer among the choices provided by your question is the third choice or letter C.

Two minerals that have different arrangements of their atoms may have different physical properties.

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S To minimize neutron leakage from a reactor, the ratio of the surface area to the volume should be a minimum. For a given volum

goblinko [34]

To minimize neutron leakage from a reactor, the ratio of the surface area to the volume should be a minimum. For a given volume V , ratio for (c) a parallelepiped of dimensions × 2 a will be $\frac{6.29961}{c^\frac{1}{3} }$

What will be the ratio of surface area and the volume of the parallelepiped

We will proceed by stating the equations of the surface area and the volume of each shape, and then identifying each of the surface area and the volume, we will take their ratios, and as it is asking for the shape which has the minimum surface area to volume ratio, therefore at some given volume, $V=const$ .

The parallelepiped whose dimension is given as

$2a,a,a$

the surface area and the volume is given respectively by:

$A=2(2a \times a)+2(a \times 2a)+2(a \times a)=10a^{2}$

$V=2a^{3}$

Let the volume be equal to the constant c, we get:

$V=c=2a^{3}\\a=(\frac{c}{2} )^\frac{1}{3}$

Hence the ratio is given by:

$\frac{A}{V} =\frac{10a^{2}}{2a^{3}}=\frac{5}{a}$

Calculating the constants, by substituting the value of $a$ in (3), we get:

$\frac{A}{V}=\frac{6.29961}{c^\frac{1}{3} }$

To learn more about parallelepiped, refer to:

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5 0

1 year ago

What additional information is needed for velocity that is not needed for speed

pychu [463]

That volocity is about how it moves not how fast it goes

4 0

3 years ago

Discuss 2 ways tolerance and empathy counteract discrimination in school and community

VladimirAG [237]

Answer:

Reducing Discrimination by Changing Social Norms

Reducing Prejudice through Intergroup Contact

Explanation:

3 0

2 years ago

A box of mass 20kg is pulled up an inclined plane by a force of 285N. Given that the value of

lorasvet [3.4K]

Answer:

19.6 m/s

Explanation:

The parameters given are:

Mass M = 20 Kg

Force F = 285 N

Angle Ø = 30 degree

Time t = 4 seconds

Coefficient of friction = 0.72

At the plane, the weight of the box will be mgsinØ

Resolving forces at the plane, we will have:

MgsinØ + Fr = F

Where Fr = frictional force.

Fr = F - mgsinØ

Substitute all the parameters into the formula

Fr = 285 - 20 × 9.8 sin30

Fr = 285 - 98

Fr = 187 N

But for the box moving toward the top of the plane,

F - Fr = ma

Where a = V/t

Substitute all the parameters involved into the formula

285 - 187 = 20 ( V/4)

98 = 5V

V = 98/5

V = 19.6 m/s

Therefore, the speed with which the box is moving is 19.6 m/s

4 0

3 years ago

Because cosmic distances are so vast, astronomers use light-years as their unit of distance. One light-year is defined as ______

8090 [49]

Answer:

Because cosmic disaster are so vast, astronomers use light-years as their unit of distance. One light-year is defined as the distance a beam of light travels in one year. The nearest star is a little more than 4.37 light-years away from us. When we see light from a galaxy 2 million light-years away, it has taken 2 million Earth years to reach us. Light from the Sun takes approximately 8.4269 minutes to reach us

Explanation:

i) One light-year is defined as the distance a light beam travels in a time of one Earth year. One light year is equivalent to 6 × 10¹² miles or 9.7 × 10¹² km

ii) The distance to the nearest star = 4.37 light-years

iii) When a star located in a galaxy that is 2.3 million light years away is seen, it has taken 2.3 million light years to reach us

iv) The distance of the Sun to the Earth = 151.58 million kilometers

The speed of light, c = 299792.458 km/s

The time it will take light to reach us from the Sun, 't', is given as follows;

t = 151.58 × 10⁶ km/(299792.458 km/s) ≈ 8.4269 minutes.

7 0

3 years ago