close

標題:

此文章來自奇摩知識+如有不便請留言告知

HI A physics mc question

發問:

2003 CE phy mc 08 Please answer with explanations

最佳解答:

There are 2 forces acting on the child exerted by the safety seat. ( 1 ) Horizontal ( which brings the child to accelerate with the car ) ( 2 ) Vertical ( normal reaction ) ( 1 ) , By F = ma, Horizontal force = 10 x 3 = 30N ( 2 ) As the child does NOT have vertical acceleration, normal reaction balances his weight. Vertical force = mg = 10 x 10 = 100N As the question is asking about the resultant force, we then combine these 2 forces by Tip-to-tail Method. Magnitude of resultant force ( By Pyth. theorem ) = √( 302 + 1002 ) = 104 N ( correct to nearest 1N ) So, the answer is C

其他解答:A9A3995907B431A4

arrow
arrow
    文章標籤
    人口 文章 醫院 奇摩 大埔
    全站熱搜
    創作者介紹
    創作者 ttltlp7 的頭像
    ttltlp7

    部落格

    ttltlp7 發表在 痞客邦 留言(0) 人氣()

    E-mail轉寄