A. There is less current flowing through the bulb.
Ohms law dictates that Electrical voltage = current x resistance. To understand current you would divide voltage by resistance. The less voltage the less current will run through the circuit.
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Answer:
![Q=94185\ J](https://tex.z-dn.net/?f=Q%3D94185%5C%20J)
Explanation:
Given:
- mass of water,
![m=0.3\ kg](https://tex.z-dn.net/?f=m%3D0.3%5C%20kg)
- initial temperature of water,
![T_i=20^{\circ}C](https://tex.z-dn.net/?f=T_i%3D20%5E%7B%5Ccirc%7DC)
- final temperature of water,
![T_f=95^{\circ}C](https://tex.z-dn.net/?f=T_f%3D95%5E%7B%5Ccirc%7DC)
- specific heat of water,
![c=4186\ J.kg^{-1}.K^{-1}](https://tex.z-dn.net/?f=c%3D4186%5C%20J.kg%5E%7B-1%7D.K%5E%7B-1%7D)
<u>Now the amount of heat energy required:</u>
![Q=m.c.\Delta T](https://tex.z-dn.net/?f=Q%3Dm.c.%5CDelta%20T)
![Q=0.3\times 4186\times (95-20)](https://tex.z-dn.net/?f=Q%3D0.3%5Ctimes%204186%5Ctimes%20%2895-20%29)
![Q=94185\ J](https://tex.z-dn.net/?f=Q%3D94185%5C%20J)
Since all of the mechanical energy is being converted into heat, therefore the same amount of mechanical energy is required.
Conductor because it creates heat.
Answer:
very smooth and polished glass mirror
Explanation:
The best type of mirror for this would be a very smooth and polished glass mirror. A metal mirror will also work but it would need to be extremely polished. This would allow light to efficiently be reflected across the room, thus effectively adding an "extra" light source to the room. If the mirror is not smooth then the light may become distorted and not reflect properly as it is supposed to. This may defeat the entire purpose of the mirror for this scenario.