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Vanyuwa [196]
3 years ago
8

An example of an exothermic reaction is:

Physics
1 answer:
elena55 [62]3 years ago
6 0

Answer:

C.

Explanation:

Exothermic refers to a RELEASE of energy through a reaction(usually chemical). When salt dissociates, polar water molecules pull apart ions, releasing energy.

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I need this to be correct and explane why its that answer.
Tanya [424]

Answer:

option A is your answer hope it will help you

4 0
2 years ago
3. A girl is running the 200 m dash. She starts by acceleration at 8m/s^2 for 7s. Then continues at this speed until the end of
antoniya [11.8K]

Answer:

10.6 s

Explanation:

Given that a girl is running the 200 m dash. She starts by acceleration at 8m/s^2 for 7s. Then continues at this speed until the end of the race. How long did it take for her to complete the race?

Solution.

If she accelerated for 7s, the velocity at which she accelerated will be:

Acceleration = velocity/time

8 = V/7

Make V the subject of the formula by cross multiplying.

V = 8 × 7

V = 56 m/s

She maintains the speed through out the journey.

Speed = distance/time

Make time the subject of formula

Time = distance/speed

Time = 200 / 56

Time = 3.57s

Therefore, she will complete the race by 7 + 3.6 = 10.6 s

7 0
3 years ago
The pressure at the button of a glass filled with water
-Dominant- [34]

Answer: Plz mark me brainlest.

The pressure in the bottom of the glass is defined as P= (pv)g/A.

  • V is the Volume.
  • A is the Area.
  • G is the acceleration due to gravity.
  • P is the density.
5 0
3 years ago
The x-axis of a trajectory represents its _____.
sineoko [7]
The x-acis of a trajectory represents its C
3 0
3 years ago
Read 2 more answers
The vertical columns in the periodic table are called _____________. families periods rows
bonufazy [111]

Answer:

families

Explanation:

periods are horizontal

4 0
3 years ago
Read 2 more answers
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