
0721 石牌校國三理化小考
Quiz
•
Physics
•
9th Grade
•
Practice Problem
•
Hard
Cindy Cindy
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20 questions
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1.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
1. 小強在觀看煙火時,看到亮光後,過了 2 秒鐘才聽到爆炸聲。已知聲音和光在空氣中的傳播速率分別為 340 公尺/秒和 30 萬公里/秒,則煙火爆炸的地點與小強的距離約為多少?
170 公尺
680 公尺
15 萬公里
60 萬公里
2.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
2. 圖為甲、乙兩車在某一時刻之時速表,僅由此圖判斷,下列敘述何者正確?
兩車之平均速率相同
兩車之平均速度相同
兩車之瞬時速率相同
兩車之運動方向相同
3.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
3. 甲速度為 10 公尺/秒向東,乙速度為 10 公尺/秒向北,則下列敘述何者正確?
兩者速度相同,速率不同
兩者速率相同,速度不同
兩者速度與速率都不同
兩者速度與速率都相同
4.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
4. 如表為某物體沿直線運動的位置與時間關係,求 1~4 秒內的平均速度為何?(以向東為正)
2 m/s,向西
2 m/s,向東
6 m/s,向西
6 m/s,向東
5.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
5. 一質量很小(但不可忽略)的木棉花絮受水平風力作用,由樹梢等速度水平飛至其東方 10 公尺的樓頂,共歷時 25 秒。已知花絮共受重力、風力、空氣阻力、空氣浮力等四力作用,則此花絮的平均速度大小為多少公尺/秒?
0.2
0.4
2.5
4
6.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
6. 請問一物體運動的位置(x)—時間(t)關係圖,哪個圖形不可能存在的?
7.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
7. 甲、乙兩鎮相距 12 公里,小芳騎腳踏車由甲鎮以 3 公里/小時的速率騎到乙鎮,又馬上以 6 公里/小時的速率騎回甲鎮,則全程的速率為多少?
0 公里/小時
2 公里/小時
4 公里/小時
6 公里/小時
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