Physics, 18.07.2019 10:30 kevinbazalar

What is striking a match an example of? a) providing activation energy to a physical reaction b) providing activation energy to a chemical reaction c) an endothermic reaction d) an endothermic process

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option B) providing activation energy to a chemical reaction.

Justification:

1) The combustion of a match is a very exothermic energy process.

2) That means that the reaction liberates a high amount of energy.

3) Process that liberate energy are told to be favourable, this is the productos of the reaction are in a more favorable stable position than before reacting. Then why then do not happen spontaeously? It is because the reactions follow a determined path and that path involves the consumption of energy (named activation energy) to form an activated complex that will then lead to the final formation of the products.

4) That means that to start the products must absorb some energy (the activation energy). Striking a match will provide such activation energy required for the match to ignite and the continue burning. Without this energy the match will never start burning.

Answer from: Quest

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.

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What do you mean there’s no jelly beans

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