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Science Junior High

⑶⑸⑹⑺⑻⑼教えてください!

測定結果である。表をよく見て、次の各問いに答えなさい。 回 図のような実験装置で電熱線に電流を流して、1分ごとに水温の変化を調べた。 水の量は 100gで、下の表は、 電熱線に加えた電圧とそのときに流れた電流と水温の ※氷1gの温度を1℃上げるのに必要な熱量は1cal であり4.2Jとする。 4 5 時間(分) 温度 3 電圧4.0V 電流1.0A 電圧6.0V 電流1.5A 0 1 2 14.4 14.9. 12.3 12.8 13.4 13.9 15.0 16.3 17.5 11.4 12.6 13.8 (1)実験に使用した電熱線の抵抗はいくらか。 電源装置 (2)電圧 4.0Vで電流が 1.0Aのときの電力はいくらか。 (3) 1分ごとの水温の変化から考えて、電圧が一定のと きに電熱線が1分ごとに発生する熱量についてわか ることを書きなさい。 (4)電圧 4.0Vのとき、実験開始から5分後に電熱線が 発生させた熱量は何Jか。 電熱線 (5)電圧 4.0Vのとき、実験開始から5分後に水が得た 熱量は何 cal か。表のデータから考えて答えなさい。 (6)(5)の熱量は何Jか。 (7)(4)の電熱線が発生した熱量と(6)の水が得た熱量の値が一致しないのはなぜか。 (8) 6.0Vの電圧で5分間電流を流したときに、水温の上昇に使われなかった熱量は何Jか。 (9) この電熱線に 8.0Vの電圧をかけたところ水温が9.0℃上昇した。電流を流した時間は だいたい何分か、次の①~⑥から最も近いものを選びなさい。 の2分 の8分 610分 60 5 24分 36分 S80908)

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English Junior High

ベストアンサーの方フォローします この問題が分からないので教えてください。

1 When we need to see the time, we look at clocks or watches. Today we can check the time very 置き時計 easily. However, it was not so easy long ago. Time keeping_has a very interesting history. 簡単に 長い間,ずっと 時間の計測 Ancient people used nature to read the time. About 6,000 years ago, Egyptians used the sun. 2 They put sticks in the ground, and the shadows told them the time. These were some of the first 話す。教えるの過去形 clocks in the world. 3 At night, people could not use the sun. About 3,500 years ago, Egyptians started to measure time without it. They put water in pots. The pots had tiny holes in them. The water decreased …なしで little by little. The lines in the pots told them the time. 4 About 1,500 years ago, other people used fire. They burned candles, for example.. The candles gave them light, and people saw the time by the lines on them. 与えるの過去形 線 5 About 700 years ago, people started to make mechanical clocks. At first, they used weights to power these clocks. The clocks told the hour with bells. However, the weig were big and heavy, so these clocks were difficult to move. 6 About 500 years ago, people improved their clocks. They used springs to power the clocks. The springs were small and light. So people could move the clocks easily. Eventually, people 小さい began to carry watches. 7 Today, we have clocks and watches everywhere. This is the result of many great inventions and many people's efforts. Even now, clocks and watches are improving. 8 We cannot really see time, but ancient people tried to recognize it. They used different ideas and technologies to measure it. When we look at our clocks and watches, we can easily see the time. Now it is time to recognize the wisdom of those ancient people.

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