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3 years ago

TRUE OR FALSE: ancient swamp plants slowly decayed and turned into peat, the first step in making coal.

2 answers:

4 0

Not so fast! you are right the first step is that the plants and animals have to decay then they turn to peat and then in a million years time you have coal !!!!!!! :)

mamaluj [8]3 years ago

3 0

Answer:

True

Explanation:

In the first step of coal making all the plant species and trees which start decaying, gets buried under the earth crust and lead to the formation of peat. The peat is further acted upon by the heat and pressure thereby leading to the formation of lignite coal (soft brown coal), which further turns into bituminous coal (black and brittle) and then get converted into anthracite (highest carbon content and is found at greatest depth)

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Two birds collide in midair. Before the collision their combined momentum was 35kg•m/sto the east. What is their combined moment

katrin [286]

Answer:

Explanation:

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3 years ago

Read 2 more answers

What did they call the bug that the astronauts brought back from the moon?

MAXImum [283]

This is a riddle meant to have a humorous effect.
So, what did they call the bug that the astronauts brought back from the moon? - A lunatic.
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3 years ago

How much heat will change 10g of ice at 00C to water at 00C? Specific heat capacity of water = 4.2J/ (g0C), latent heat of fusio

arlik [135]

Answer:

0 J

Explanation:

If it's at the same temperature then it doesn't need more heat. So it'd be 0 J since it's already at 0C.

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3 years ago

The fastest time ever run at Pikes Peak is 7:57. That’s way too long. If we removed all the curves, making a straight line from

anygoal [31]

Answer: 271.4 s

Explanation:

We are told the top speed (maximum speed) $V_{max}$ the car has is:

$V_{max}=203 mph=90.74 m/s$ taking into account $1 mile=1609.34 m$

And the car's average acceleration $a_{ave}$ is:

$a_{ave}=0.091 g=2.93 ft/s^{2}=0.89 m/s^{2}$

Since:

$a_{ave}=\frac{V_{f}-V_{o}}{\Delta t}$ (1)

Where:

$V_{f}=V_{max}=90.74 m/s$ is the car's final speed (top speed)

$V_{o}=0 m/s$ because it starts from rest

$\Delta t$ is the time it takes to reach the top speed

Finding this time:

$\Delta t=\frac{V_{f}-V_{o}}{a_{ave}}$ (2)

$\Delta t=\frac{90.74 m/s - 0 m/s}{0.89 m/s^{2}}$ (3)

$\Delta t=t_{1}=101.95 s$ (4)

Now we have to find the distance $d$ the car traveled at this maximum speed with the following equation:

$V_{f}^{2}=V_{o}^{2} + 2a_{ave} d$ (5)

Isolating $d$ :

$d=\frac{V_{f}^{2}}{2a_{ave}}$ (6)

$d=\frac{(90.74 m/s)^{2}}{2(0.89 m/s^{2})}$ (7)

$d=4625.70 m$ (8)

On the other hand, we know the total distance $D$ traveled by the car is:

$D=12.42 miles = 19988.052 m$

Hence the remaining distance is:

$d_{remain}=D-d=19988.052 m - 4625.70 m$ (9)

$d_{remain}=15362.35 m$ (10)

So, we can calculate the time $t_{2}$ it took to this car to travel this remaining distance $d_{remain}$ at its top speed $V_{max}$ , with the following equation: