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4 years ago

Which nonmetal makes up diamond, graphite, and the majority of coal?

Physics

2 answers:

Alenkasestr [34]4 years ago

5 0

D-carbon
When compressed forms diamonds

Lostsunrise [7]4 years ago

3 0

Answer

D- Carbon

Explanation:

Carbon, as an element, is the basis of what is referred to as diamond, graphite, and coal. Coal is a solid form with high content of hydrocarbon making coal amenable to burning). In a much purer form Carbon occurs in graphite and diamond. While in graphite carbon atoms bond to two neighboring atoms, in diamond they do so to four neighboring carbon atoms in a "tetrahedron-like" configuration (making diamond very hard).

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For a force to be balanced, its net force must be __________ N.

Nookie1986 [14]

Answer:

equal

......,.............

........,...

4 0

3 years ago

If 10 calories of energy are added to 2 grams of ice at -30° C, calculate the final temperature of the ice. (Notice that the spe

MA_775_DIABLO [31]

<span>At where:

Q = amount of sensible heat (cal or J).

C = specific heat of the substance constituting the body (cal / g ° C or J / kg ° C).

M = body mass (g or kg).

Δθ = temperature variation (° C).

T = final temperature

To = Initial temperature

Data:
Q = 10 calories
M = 2 grams
C (ice)= 0.550 cal / g ° C
To = -30 ° C
T =?

Formula: Q = m * c * Δθ

Resolution:
Substitute
Q = m * c * Δθ
10 = 2 * 0.550 * [T-To]
10 = 1.1 * [T-(-30)]
10 = 1.1 * [T+30]
10 = 1.1T + 33
-1.1T = 33 - 10
-1.1T = 23 .(-1)
1.1T = - 23
T = </span> $\frac{-23}{1.1}$
T ≈ - 20.90 ° C (the final temperature of the ice)

5 0

3 years ago

A concert loudspeaker suspended high off the ground emits 32.0 W of sound power. A small microphone with a 1.00 cm^2 area is 52.

lesya [120]

Answer:

Sound Intensity at microphone's position is $9.417\times 10^{- 4} W/m^{2}$

The amount of energy impinging on the microphone is $9.417\times 10^{- 8} W/m^{2}$

Solution:

As per the question:

Emitted Sound Power, $P_{E} = 32.0 W$

Area of the microphone, $A_{m} = 1.00 cm^{2} = 1.00\times 10^{- 4} m^{2}$

Distance of microphone from the speaker, d = 52.0 m

Now, the intensity of sound, $I_{s}$ at a distance away from the souce of sound follows law of inverse square and is given as:

$I_{s} = \frac{P_{E}}{Area} = \frac{P_{E}}{4\pi d^{2}}$

$I_{s} = \frac{32.0}{4\pi (52.0)^{2}} = 9.417\times 10^{- 4} W/m^{2}$

Now, the amount of sound energy impinging on the microphone is calculated as:

If $I_{s}$ be the Incident Energy/ $m^{2}/s$

Then

The amount of energy incident per 1.00 $cm^{2} = 1.00\times 10^{- 4} m^{2}$ is:

$I_{s}(1.00\times 10^{- 4}) = 9.417\times 10^{- 4}\times 1.00\times 10^{- 4} = 9.417\times 10^{- 8} J$

7 0

3 years ago

. On a safari, a team of naturalists sets out toward a research station located 9.6 km away in a direction 42° north of east. Af

Elden [556K]

Answer: $\theta =49.76^{\circ}$ North of east

Explanation:

Given

Research station is 9.6 km away in $42^{\circ}$ North of east

after travelling 3.1 km $25^{\circ}$ north of east

Position vector of safari after 3.1 km is

$r_2=3.1cos25\hat{i}+3.1sin25\hat{j}$

Position vector if had traveled correctly is

$r_0=9.6cos42\hat{i}+9.6sin42\hat{j}$

Now applying triangle law of vector addition we can get the required vector $(r_1)$

$r_1+r_2=r_0$

$r_1=(9.6cos42-3.1cos25)\hat{i}+(9.6sin42-3.1sin25)\hat{j}$

$r_1=4.325\hat{i}+5.112\hat{j}$

Direction is given by

$tan\theta =\frac{y}{x}=\frac{5.112}{4.325}$

$\theta =49.76^{\circ}$

8 0

3 years ago

Why is blood important

Margarita [4]

Blood is essential for good health because the body depends on a steady supply of fuel and oxygen to reach its billions of cells. Even the heart couldn't survive without blood flowing through the vessels that bring nourishment to its muscular walls.

5 0

3 years ago