A student built a fire using coal. the coal started to burn. which statement best describes the energy changes that occurred.

2 answers:

5 0

ANSWER: B. The thermal energy stored in the coal changed to light energy and chemical energy.
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EXPLANATION: thermal energy is already within the coal and because of the light from the fire, that's obviously light energy. And in the end, there is a chemical reaction after the coal burns to ash, and that is chemical energy! I hope this helps!☺️ Please give Brainliest!!

sergiy2304 [10]2 years ago

4 0

Answer:

98% sure the answer is A, as coal, when burning, releases thermal and light energy through the fire.

Explanation:

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Serga [27]

Answer:

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Explanation:

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2 years ago

Read 2 more answers

2. Determine the current in a 120-watt bulb plugged into a 120-volt outlet.

Sergio039 [100]

Answer:

1 ampere

Explanation:

Power = VI

V = voltage

I = current

Given

Power = 120 watts

V = 120 volts

Therefore

120 = 120 x I

Divide both sides by 120

120/120 = 120/120 x I

1 = I

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Peter’s body supplies a force of 500 N to run up a 10-m hill in 10 s. How much power is involved in Peter’s run up the hill? Exp

shutvik [7]

Answer: 500 Watts

Explanation:

Power $P$ is the speed with which work $W$ is done. Its unit is Watts ( $W$ ), being $1 W=\frac{1 Joule}{1 s}$ .

Power is mathematically expressed as:

$P=\frac{W}{t}$ (1)

Where $t$ is the time during which work $W$ is performed.

On the other hand, the Work $W$ done by a Force $F$ refers to the release of potential energy from a body that is moved by the application of that force to overcome a resistance along a path. It is a scalar magnitude, and its unit in the International System of Units is the Joule (like energy). Therefore, 1 Joule is the work done by a force of 1 Newton when moving an object, in the direction of the force, along 1 meter ( $1J=(1N)(1m)=Nm$ ).