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vampirchik [111]
3 years ago
14

In one town, there are several natural gas drilling sites. Scientists warn town officials that the health of the people could be

affected by the natural gas wells, so in an effort to protect its citizens, the town temporarily prevents builders from developing homes and businesses within two miles of the drill sites.
This example demonstrates how science can be used to inform decision making at the ______ level.
A.
international
B.
national
C.
community
D.
state
Physics
2 answers:
KATRIN_1 [288]3 years ago
8 0

Answer:

C - Community (if wrong try D )

Explanation:

I would go with c because national addresses the whole and State addresses that whole state that only the town has that problem Usa while C while only address the town since the problem is only affecting one town  

Citrus2011 [14]3 years ago
7 0

Answer:

C. community

Explanation:

Community consists of a local residence, like a town.

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1. An express train, traveling at 36 m/s, is accidentally sidetracked onto a local train track. The express engineer spots a loc
Colt1911 [192]

Answer:

(i) 12 seconds

(ii) 216 meters from the initial position

(iii) 132 meters from the initial position

(iv) No

Explanation:

Speed of express train =36 m/s

Speed of local train =11 m/s

The initial distance between the local train and passenger train =100 m.

Due to the application of breaks, the express train slows at the rare of 3.0 m/s^2.

So, the acceleration of the express train, a=-3 m/s^2.

(i) Let t be the time the express train takes to stop.

From the equation of motion,

v=u+at

where, v: final velocity, u: initial velocity, a: constant acceleration, t: time taken to change the speed from u to v.

In this case, v=0, u=36 m/s, a=-3 m/s^2

So, 0=36+(-3)t

\Rightarrow t= 36/3=12 seconds.

(ii) To compute the distance traveled, s, till the express train stops, using

v^2=u^2+2as

\Rightarrow 0^2=36^2+2(-3)s

\Rightarrow s=\frac{36\times36}{6}

\Rightarrow s=216 meters.

(iii) The local train is moving at a speed of 11 m/s

So, in 12 seconds, the distance, d, traveled by the local train

d= 11x12=132 meters [as distance= speed x time]

(iv) Let 0 be the reference position which is the initial position of the express train.

So, at the initial time, the position of the local train is at 100m.

After 12 seconds:

The position of the express train is at 216 m [using part (ii)]

and the position of the local train is at 100+132=232m  [using part (iii)].

So, the local train is still ahead of the express train, hence the trains didn't collide.

6 0
2 years ago
During a chemical reaction, increasing the temperature often
Nadya [2.5K]

Answer:c

Explanation:

the rate of reaction increases as temperature increases

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