Mathematics>Standard Multiple Choice
Read the following SAT test question and then click on a button to select your answer.
v=152-9.8t
A volcanologist modeling a volcanic eruption determines that vertical velocity, v, in meters per second (m/s), of the debris reaching the highest altitude t seconds after the eruption can be given by the equation above. Which of the following is the best interpretation of 152 in this context?
A.The velocity changed by 152 m/s every second.
B.The highest altitude reached by debris was 152 meters.
C.The debris hit the ground 152 seconds after the eruption.
D.The debris had a vertical velocity of 152 m/s at the time of eruption.
答案:B
解析:Choice D is correct.
重点词汇:
volcanologist [,vɔlkən'ɔlədʒist] n. 火山学家
altitude ['æltɪtjuːd] n. 高地;高度;[数] 顶垂线;(等级和地位等的)高级
equation [ɪ'kweɪʒ(ə)n] n. 方程式,等式;相等;[化学] 反应式
interpretation [ɪntɜːprɪ'teɪʃ(ə)n] n. 解释;翻译;演出
velocity [vəˈlɒsəti] n. 【物】速度
altitude ['æltɪtjuːd] n. 高地;高度;[数] 顶垂线;(等级和地位等的)高级;海拔
debris [ˈdeɪbri:] n. 碎片,残骸
vertical ['vɜːtɪk(ə)l] n. 垂直线,垂直面 adj. 垂直的,直立的;[解剖] 头顶的,顶点的
velocity [vəˈlɒsəti] n. 【物】速度
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