選修物理I-4-1~4-2

Quiz
•
Physics
•
11th Grade
•
Medium
來加 以
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5 questions
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1.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
一均勻彈簧水平放置未受力時長度為1m,在其上依次以1cm之間隔畫上刻度0、1、2、3、……、99、100。設此彈簧遵守虎克定律。今將此彈簧0刻度的一端掛在天花板上,令另一端自然下垂,平衡時測得刻度50與51相距1.2cm,則下列各項中2刻度間距離最接近2.1cm的為何?
0.5與2.5
11.5與13.5
49.5與51.5
74.5與76.5
86.5與88.5
2.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
由一對完全相同的強力理想彈簧所構成可垂直彈射之投射裝置,如圖所示,設g為重力加速度,彈簧的彈性常數為k。若質量為m的物體置於質量可忽略的彈射底盤上,欲將物體以7g的起始加速度垂直射向空中,此時兩彈簧與鉛垂線的夾角皆為θ = 60°,則每個彈簧的伸長量為下列何者?
4mg/k
5mg/k
6mg/k
7mg/k
8mg/k
3.
MULTIPLE SELECT QUESTION
10 mins • 1 pt
如圖所示,以忽略質量的細繩繫一輕彈簧(可忽略質量的彈簧),彈簧下方再懸掛重量W為5 kgw的木塊,當系統呈靜止時,彈簧的伸長量為2 cm,如圖(a)所示。現將彈簧取下平行放置於光滑水平地面上,兩端各施以5 kgw的力將彈簧拉開而靜止,如圖(b)所示。上述操作彈簧皆在比例限度內,試問:下列敘述哪些正確(應選n項,n>1)?
圖(a)中,細繩施予彈簧的張力為5 kgw向上
圖(a)中,細繩施予木塊的張力為5 kgw向上
此彈簧的彈性常數為2.5 kgw/cm
圖(b)中,彈簧的伸長量為4 cm
圖(b)中,彈簧的伸長量為2.5 cm
4.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
曾同學站在等速行駛中的車內,當車子突然加速時,他的身體會向後傾。依據附圖,下列哪一項是造成曾同學身體向後傾的主要理由?
車地板給曾同學一向後的摩擦力
車內空氣給曾同學一向後的力
車地板給曾同學一向前的摩擦力
車突然加速時,改變了地球給曾同學的重力方向
因為車加速後曾同學處於慣性坐標系中
5.
MULTIPLE CHOICE QUESTION
10 mins • 1 pt
已知地球由西向東自轉,若在北韓朝正南方往赤道上空發射長程飛彈,則彈著地在出發點(北韓)的
北偏西
南偏西
北偏東
南偏東
正南
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