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第五章5.7课后课时精练(1)_E015高中全科试卷_数学试题_必修1_02.同步练习_5.同步练习(第五套)_(新教材)人教数学必修第1(课件+课时练+单元测试+复习)第5章(共68份打包)

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第五章5.7课后课时精练(1)_E015高中全科试卷_数学试题_必修1_02.同步练习_5.同步练习(第五套)_(新教材)人教数学必修第1(课件+课时练+单元测试+复习)第5章(共68份打包)
第五章5.7课后课时精练(1)_E015高中全科试卷_数学试题_必修1_02.同步练习_5.同步练习(第五套)_(新教材)人教数学必修第1(课件+课时练+单元测试+复习)第5章(共68份打包)
第五章5.7课后课时精练(1)_E015高中全科试卷_数学试题_必修1_02.同步练习_5.同步练习(第五套)_(新教材)人教数学必修第1(课件+课时练+单元测试+复习)第5章(共68份打包)
第五章5.7课后课时精练(1)_E015高中全科试卷_数学试题_必修1_02.同步练习_5.同步练习(第五套)_(新教材)人教数学必修第1(课件+课时练+单元测试+复习)第5章(共68份打包)
第五章5.7课后课时精练(1)_E015高中全科试卷_数学试题_必修1_02.同步练习_5.同步练习(第五套)_(新教材)人教数学必修第1(课件+课时练+单元测试+复习)第5章(共68份打包)
第五章5.7课后课时精练(1)_E015高中全科试卷_数学试题_必修1_02.同步练习_5.同步练习(第五套)_(新教材)人教数学必修第1(课件+课时练+单元测试+复习)第5章(共68份打包)

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A级:“四基”巩固训练 一、选择题 1.已知函数f(x)=2sin(ωx+φ)(ω>0)的部分图象如图所示,则下列不可能是 函数f(x)的对称中心的是( ) A. B. C. D. 答案 B 解析 T=-,解得 T=π,∴ω=2,又图象过点,∴2sin=2,则 φ=-+ 2kπ,k∈Z,∴f(x)=2sin,∵f=2sin=-2≠0,∴不可能是函数f(x)的对称中心, 故选B. 2.商场人流量被定义为每分钟通过入口的人数,五一节某商场的人流量满 足函数F(t)=50+4sin(t≥0),则在下列哪个时间段内人流量是增加的?( ) A.[0,5] B.[5,10] C.[10,15] D.[15,20] 答案 C 解析 ∵F(t)=50+4sin(t≥0),由 2kπ-≤≤2kπ+,k∈Z,得 4kπ- π≤t≤4kπ+π,k∈Z.∵t≥0,∴当k=0时,递增区间为[0,π],当k=1时,递增 区间为[3π,5π],∵[10,15]⊆[3π,5π],∴此时函数单调递增.故选C. 3.一根长l cm的线,一端固定,另一端悬挂一个小球,小球摆动时离开平 衡位置的位移s(cm)与时间t(s)的函数关系式是s=3cos,其中g是重力加速度, 当小球摆动的周期是1 s时,线长l等于( ) A. B. C. D. 答案 D 解析 因为周期T=,所以==2π,则l=. 4.如图所示的是一个半径为3米的水轮,水轮的圆心O距离水面2米,已 知水轮每分钟旋转4圈,水轮上的点P到水面的距离y(米)与时间t(秒)满足关系式y=Asin(ωt+φ)+2,则( ) A.ω=,A=3 B.ω=,A=3 C.ω=,A=5 D.ω=,A=5 答案 B 解析 ∵y=Asin(ωt+φ)+2,最高点离平衡位置距离是3,∴A=3.∵水轮每分 钟旋转4圈,转动一周为一个周期,∴T=15秒,ω==.故ω=,A=3. 5.如图,有一广告气球,直径为6 m,放在公司大楼上空,当行人仰望气球 中心时,测得仰角∠BAC=,测得β=.若β很小时,可取sinβ≈β,其中β用弧度 制表示,试估算该气球的高BC的值约为( ) A.70 m B.86 m C.102 m D.118 m 答案 B 解析 由已知,CD=3 m,β=.∵=sinβ=β=,∴AC=×3≈172(m),∴BC= ACsin≈86(m). 二、填空题 6.如图为某简谐运动的图象,这个简谐运动需要________s往返一次.答案 0.8 解析 由图象知周期T=0.8-0=0.8(s),则这个简谐运动需要0.8 s往返一次. 7.某城市一年中12个月的平均气温y与月份x的关系可近似地用函数 y=a +Acos(x=1,2,3,…,12)来表示,已知6月份的月平均气温最高,为 28 ℃,12 月份的月平均气温最低,为18 ℃,则10月份的月平均气温为________ ℃. 答案 20.5 解析 x=6时,y =a+A=28,x=12时, max y =a-A=18,解得a=23,A=5.所以当x=10时, min y=23+5cos=20.5. 8.下图表示相对于平均海平面的某海湾的水面高度 h(m)在某天0~24时的 变化情况,则水面高度h关于时间t的函数解析式为________. 答案 h=-6sint,t∈[0,24] 解析 根据题图设 h=A·sin(ωt+φ),则A=6,T=12,∴=12,∴ω=,点 (6,0)为“五点”作图法中的第一点,∴×6+φ=0,∴φ=-π,∴h=6sin=- 6sint,t∈[0,24]. 三、解答题 9.健康成年人的收缩压和舒张压一般为 120~140 mmHg和60~90 mmHg. 心脏跳动时,血压在增加或减小.血压的最大值、最小值分别称为收缩压和舒张 压,血压计上的读数就是收缩压和舒张压,读数120/80 mmHg为标准值. 设某人的血压满足函数式 p(t)=115+25sin(160πt),其中 p(t)为血压 (mmHg),t为时间(min),试回答下列问题: (1)求函数p(t)的周期;(2)求此人每分钟心跳的次数; (3)求出此人的血压和血压计上的读数,并与正常值比较. 解 (1)T===(min). (2)f==80(次). (3)p(t) =115+25=140 mmHg, max p(t) =115-25=90 mmHg. min 即收缩压为140 mmHg,舒张压为90 mmHg,比正常值高. 10.在一个港口,相邻两次高潮发生时间相距 12 h,低潮时水的深度为 8.4 m,高潮时为16 m,一次高潮发生在10月10日4:00.每天涨潮落潮时,水的深 度d(m)与时间t(h)近似满足关系式d=Asin(ωt+φ)+h. (1)若从10月10日0:00开始计算时间,试用一个三角函数来近似描述该港 口的水深d(m)和时间t(h)之间的函数关系; (2)10月10日17:00该港口水深约为多少?(精确到0.1 m) (3)10月10日这一天该港口共有多少时间水深低于10.3 m? 解 (1)依题意知T==12, 故ω=,h==12.2, A=16-12.2=3.8, 所以d=3.8sin+12.2; 又因为t=4时,d=16, 所以sin=1, 所以φ=-, 所以d=3.8sin+12.2. (2)t=17时,d=3.8sin+12.2=3.8sin+12.2≈15.5(m). (3)令3.8sin+12.2<10.3, 有sin<-, 因此2kπ+<t-<2kπ+(k∈Z), 所以2kπ+
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  1. CONNECT:[ UseTime:0.000806s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001136s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000636s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.003633s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001175s ]
  6. SELECT * FROM `set` [ RunTime:0.000551s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001284s ]
  8. SELECT * FROM `wendang` WHERE `id` = 249475 LIMIT 1 [ RunTime:0.003655s ]
  9. UPDATE `wendang` SET `liulancishu` = 6 WHERE `id` = 249475 [ RunTime:0.008486s ]
  10. UPDATE `wendang` SET `lasttime` = 1773100319 WHERE `id` = 249475 [ RunTime:0.001029s ]
  11. SELECT * FROM `wendang` WHERE `id` < 249475 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001192s ]
  12. SELECT * FROM `wendang` WHERE `id` > 249475 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001073s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 249475 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.010965s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 249475 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004330s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 249475 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.014563s ]
0.203698s