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4 years ago

8

Get the lead out! That is really graphite in your pencil, not lead. Graphite is a form of carbon. Use the physical properties of

graphite to classify it using the choices below. A) metal B) nonmetal C) metalloid D) rare Earth element

2 answers:

Svetllana [295]4 years ago

5 0

NON-METAL!!!!!!!!!!!!!!!!!!!!!!!!!!!

Alja [10]4 years ago

4 0

The answer to this question is B. Nonmetal

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3 years ago

You are driving your car along a country road at a speed of 27.0 m/s. as you come over the crest of a hill, you notice a farm tr

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speed of the car = 27 m/s

speed of truck ahead = 10 m/s

relative speed of car with respect to truck

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relative deceleration of car

$a_r = -7 m/s^2$

now the distance before they stop with respect to each other is given by

$v_f^2 - v_i^2 = 2 a d$

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so it will come at the same speed of truck after 20.6 m distance and hence it will not hit the truck as the distance of the truck is 25 m from car

Part b)

Distance traveled by car before it stops is given by

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$s = 52.1 m$

so it will stop after it will cover total 52.1 m distance

Part c)

time taken by the car to stop

$v_f - v_i = at$

$0 - 27 = (-7) * t$

$t = 3.86 s$

now the distance covered by truck in same time

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<em>so the distance between them is 11.5 m</em>

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3 years ago