摘要： 以ce,se,ze,(d)ge结尾的名词加s.其读音为[iz].
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如图所示是长度为L＝8.0m水平传送带，其皮带轮的直径为d＝0.40m，传送带上部距地面的高度为h＝0.80m。一个旅行包（视为质点）以v0＝10m/s的初速度从左端滑上传送带。旅行包与皮带间的动摩擦因数μ＝0.60。g取10m/s2。求：
（1）若传送带静止，旅行包滑到B端时，若没有人取包，旅行包将从B端滑落到地面上，则包的落地点距B端的水平距离为多少？
（2）当皮带轮顺时针匀速转动，其角速度为ω0="20" rad/s时，求旅行包在皮带上运动的时间与旅行包落地时的速度；
（3）设皮带轮以不同的角速度顺时针匀速转动，画出旅行包落地点距B端的水平距离s随角速度ω变化的图象（ω的取值范围从0到100 rad/s）。
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（1）若传送带静止，旅行包滑到B端时，若没有人取包，旅行包将从B端滑落到地面上，则包的落地点距B端的水平距离为多少？
（2）当皮带轮顺时针匀速转动，其角速度为ω0="20" rad/s时，求旅行包在皮带上运动的时间与旅行包落地时的速度；
（3）设皮带轮以不同的角速度顺时针匀速转动，画出旅行包落地点距B端的水平距离s随角速度ω变化的图象（ω的取值范围从0到100 rad/s）。
查看习题详情和答案>>
如图所示是长度为L＝8.0m水平传送带，其皮带轮的直径为d＝0.40m，传送带上部距地面的高度为h＝0.80m。一个旅行包（视为质点）以v0＝10m/s的初速度从左端滑上传送带。旅行包与皮带间的动摩擦因数μ＝0.60。g取10m/s2。求：
（1）若传送带静止，旅行包滑到B端时，若没有人取包，旅行包将从B端滑落到地面上，则包的落地点距B端的水平距离为多少？
（2）当皮带轮顺时针匀速转动，其角速度为ω0="20" rad/s时，求旅行包在皮带上运动的时间与旅行包落地时的速度；
（3）设皮带轮以不同的角速度顺时针匀速转动，画出旅行包落地点距B端的水平距离s随角速度ω变化的图象（ω的取值范围从0到100 rad/s）。
查看习题详情和答案>>
（1）若传送带静止，旅行包滑到B端时，若没有人取包，旅行包将从B端滑落到地面上，则包的落地点距B端的水平距离为多少？
（2）当皮带轮顺时针匀速转动，其角速度为ω0="20" rad/s时，求旅行包在皮带上运动的时间与旅行包落地时的速度；
（3）设皮带轮以不同的角速度顺时针匀速转动，画出旅行包落地点距B端的水平距离s随角速度ω变化的图象（ω的取值范围从0到100 rad/s）。
查看习题详情和答案>>
如图所示是长度为L＝8.0m水平传送带，其皮带轮的直径为d＝0.40m，传送带上部距地面的高度为h＝0.80m。一个旅行包（视为质点）以v0＝10m/s的初速度从左端滑上传送带。旅行包与皮带间的动摩擦因数μ＝0.60。g取10m/s2。求：
（1）若传送带静止，旅行包滑到B端时，若没有人取包，旅行包将从B端滑落到地面上，则包的落地点距B端的水平距离为多少？
（2）当皮带轮顺时针匀速转动，其角速度为ω0="20" rad/s时，求旅行包在皮带上运动的时间与旅行包落地时的速度；
（3）设皮带轮以不同的角速度顺时针匀速转动，画出旅行包落地点距B端的水平距离s随角速度ω变化的图象（ω的取值范围从0到100 rad/s）。
查看习题详情和答案>>
（1）若传送带静止，旅行包滑到B端时，若没有人取包，旅行包将从B端滑落到地面上，则包的落地点距B端的水平距离为多少？
（2）当皮带轮顺时针匀速转动，其角速度为ω0="20" rad/s时，求旅行包在皮带上运动的时间与旅行包落地时的速度；
（3）设皮带轮以不同的角速度顺时针匀速转动，画出旅行包落地点距B端的水平距离s随角速度ω变化的图象（ω的取值范围从0到100 rad/s）。
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短文填空 阅读下则短文，然后在空白处写出适当的单词，单词首字母已给出。[有的词请注意词形的变化！] （共12个空，做对一个得1分，共10分）
How times flies! Junior 3 students will take the senior high school student entrance exam. They are studying hard for this big challenge, and they are also 【小题1】w about it. Do they have time to do something to celebrate their middle school years? Many do.
Liu Jia, 14, from Beijing said that in her class students are 【小题2】w goodbye messages or letters for each other. They are also giving photos to each other.
“Even the head teacher has a project,” said Liu. “She 【小题3】p to put all our class photos onto a CD and give each student one.”
Li Wei, 14, in Xianning, Hubei said that their English teacher Ms Deng asks them to write what they want to be when they【小题4】g up on the paper. She likes her students to come back after they graduate, and share their teen-time dreams together. Doing that 【小题5】e her students to work harder for their future.
Chen Ze, 15, in Guangzhou said his classmates are making “lucky stars” as graduation 【小题6】g . The cheerful stars are 【小题7】m of colored paper.
“【小题8】B you make a lucky star, you write some words for the person on the paper,” said Chen. “He or she can read the words after they open the star.”
In Xiao Xing’s school, each Junior 3 student will get a yearbook, in which the graduation classes will put their photos and self-introductions(自我介绍).
Xiao said, “ We have written a 【小题9】p in the ancient style as the self-introduction!”
“Our class may be not the one with the best school grade but it must be the 【小题10】m creative one,” said Xiao. “ I feel 【小题11】p of studying in such a class!”
What good ideas! I think all those will 【小题12】r them of their good days. 查看习题详情和答案>>
How times flies! Junior 3 students will take the senior high school student entrance exam. They are studying hard for this big challenge, and they are also 【小题1】w about it. Do they have time to do something to celebrate their middle school years? Many do.
Liu Jia, 14, from Beijing said that in her class students are 【小题2】w goodbye messages or letters for each other. They are also giving photos to each other.
“Even the head teacher has a project,” said Liu. “She 【小题3】p to put all our class photos onto a CD and give each student one.”
Li Wei, 14, in Xianning, Hubei said that their English teacher Ms Deng asks them to write what they want to be when they【小题4】g up on the paper. She likes her students to come back after they graduate, and share their teen-time dreams together. Doing that 【小题5】e her students to work harder for their future.
Chen Ze, 15, in Guangzhou said his classmates are making “lucky stars” as graduation 【小题6】g . The cheerful stars are 【小题7】m of colored paper.
“【小题8】B you make a lucky star, you write some words for the person on the paper,” said Chen. “He or she can read the words after they open the star.”
In Xiao Xing’s school, each Junior 3 student will get a yearbook, in which the graduation classes will put their photos and self-introductions(自我介绍).
Xiao said, “ We have written a 【小题9】p in the ancient style as the self-introduction!”
“Our class may be not the one with the best school grade but it must be the 【小题10】m creative one,” said Xiao. “ I feel 【小题11】p of studying in such a class!”
What good ideas! I think all those will 【小题12】r them of their good days. 查看习题详情和答案>>
如图所示是长度为L＝8.0m水平传送带，其皮带轮的直径为d＝0.40m，传送带上部距地面的高度为h＝0.80m。一个旅行包（视为质点）以v0＝10m/s的初速度从左端滑上传送带。旅行包与皮带间的动摩擦因数μ＝0.60。g取10m/s2。求：
（1）若传送带静止，旅行包滑到B端时，若没有人取包，旅行包将从B端滑落到地面上，则包的落地点距B端的水平距离为多少？
（2）当皮带轮顺时针匀速转动，其角速度为ω0="20" rad/s时，求旅行包在皮带上运动的时间与旅行包落地时的速度；
（3）设皮带轮以不同的角速度顺时针匀速转动，画出旅行包落地点距B端的水平距离s随角速度ω变化的图象（ω的取值范围从0到100 rad/s）。
查看习题详情和答案>>
（1）若传送带静止，旅行包滑到B端时，若没有人取包，旅行包将从B端滑落到地面上，则包的落地点距B端的水平距离为多少？
（2）当皮带轮顺时针匀速转动，其角速度为ω0="20" rad/s时，求旅行包在皮带上运动的时间与旅行包落地时的速度；
（3）设皮带轮以不同的角速度顺时针匀速转动，画出旅行包落地点距B端的水平距离s随角速度ω变化的图象（ω的取值范围从0到100 rad/s）。
查看习题详情和答案>>