我們把一塊木頭壓在一桶水底,然後把手放開,在木頭浮出水面之前,其速度隨上升高度而增加,所以木頭的位能及動能皆同時增加;換句話說,木頭所具有的力學能會隨上升高度而增加。那麼,如何利用能量守恆定律來解釋此現象?

20210608Test

Quiz
•
Physics
•
10th Grade
•
Hard
栢川 林
Used 1+ times
FREE Resource
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
木頭所增加的能量是由水的位能減少所提供
在水裡,因為有浮力,所以無法應用能量守恆定律
木頭所具有的能量隨上升高度而增加,所以能量顯然不守恆
上層的水具有較高的溫度,木頭所增加的能量是由水的熱量所提供
2.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
小華將100公克的100℃沸水與150公克的0℃冰塊放在絕熱容器中。當達成熱平衡時,剩下多少公克的冰未熔化?
150
100
25
10
0
3.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
如果水銀的脹縮程度小於玻璃,則水銀溫度計的刻度愈往上方,溫度
愈高
愈低
不一定
無法判定
4.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
銅的比熱0.09卡/克-℃,在質量50克銅製容器內裝有100克的某液體,加熱至100℃後,加入8℃、300克的水後,溫度變為24℃,則該液體之比熱為若干卡/克-℃?
0.39
0.59
0.79
0.99
0.69
5.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
若以a代表核能,c代表化學能,e代表電能,h代表熱能,k代表動能。則核能發電時能量轉換的次序是
ace
ahke
ahe
ache
6.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
下列敘述,何者錯誤?
核能發電廠是利用核熔合原理
核分裂會產生放射性廢料
太陽所放射出的能量是以核熔合方式產生核能
核熔合所需要的原料取自海水
7.
MULTIPLE SELECT QUESTION
15 mins • 1 pt
(多選)下列何者作功為零?
推行李使之等速前進,推力對行李所做的功
球拋出離手後,落地過程中手對球所作的功
用力推車,車不動,推力對車所作的功
物體於水平面移動,重力對物體所作的功
單擺運動下降期間重力對擺錘所作的功
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