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Mrrafil [7]
3 years ago
10

Which is an example of a chemical change?

Physics
2 answers:
laila [671]3 years ago
7 0
When you put coke on a rusty bumper and the rust comes off. or if something rust because the chemical make up of the object has changed.
zhenek [66]3 years ago
3 0
Fire burning wood or a other thing
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A ranger in a national park is driving at 52 km/h when a deer jumps onto the road 87 m ahead of the vehicle. After a reaction ti
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Answer:

Time, t = 0.23 seconds

Explanation:

It is given that,

Initial speed of the ranger, u = 52 km/h = 14.44 m/s

Final speed of the ranger, v = 0 (as brakes are applied)

Acceleration of the ranger, a=-4\ m/s^2

Distance between deer and the vehicle, d = 87 m

Let d' is the distance covered by the deer so that it comes top rest. So,

d'=\dfrac{v^2-u^2}{2a}

d'=\dfrac{-(14.44)^2}{2\times -4}

d' = 26.06 m

Distance between the point where the deer stops and the vehicle is :

D=d-d'

D=87 - 26.06 = 60.94 m

Let t is the maximum reaction time allowed if the ranger is to avoid hitting the deer. It can be calculated as :

t=\dfrac{v}{D}

t=\dfrac{14.44}{60.94}

t = 0.23 seconds

Hence, this is the required solution.

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g A high-energy photon turns into and electron and a positron. (A positron has exactly the same mass as the electron, but opposi
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Answer:

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