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(福建省福州一中2019届高三模拟)如图甲所示,足够长的平行光滑金属导轨ab、cd倾斜放置,两导轨之间的距离为L=0.5 m,导轨平面与水平面的夹角θ=30°,导轨上端a、c之间连接有一阻值为R 1 =4 Ω的电阻,下端b、d之间接有一阻值为R 2 =4 Ω的小灯泡.有理想边界的磁场垂直于导轨平面向上,虚线ef为磁场的上边界,ij为磁场的下边界,此区域内的磁感应强度B随时间t变化的规律如图乙所示,现将一质量为m=0.2 kg的金属棒MN从距离磁场上边界ef一定距离处从t=0时刻开始由静止释放,金属棒MN从开始运动到经过磁场的下边界ij的过程中,小灯泡的亮度始终不变.金属棒MN在两轨道间的电阻r=1 Ω,其余电阻忽略不计,ef、ij边界均垂直于两导轨,重力加速度g取10 m/s 2 .求: (1)小灯泡的实际功率; (2)金属棒MN穿出磁场前的最大速率; (3)整个过程中小灯泡产生的热量.
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参考答案：
举一反三
【单选题】根据《美国道路通行能力手册》(HCM),关于道路可能通行能力的修正系数的说法错误的是
A.
车道越宽，修正系数越大
B.
侧向净宽越大，修正系数越大
C.
车型越大，修正系数越大
D.
视距越大，修正系数越大
查看完整题目与答案
【判断题】计算机能够直接识别和处理的语言是汇编语言。
A.
正确
B.
错误
查看完整题目与答案
【单选题】In author’s mind, which one is not mentioned about writing?
A.
T o write is to transform that inward gaze into words.
B.
T o study the worlds into which we pass when we retire into ourselves.
C.
T o do so with patience, obstinacy, and joy.
D.
T o look out the window at the children playing in the street or at trees and a view, or even at a black wall.
查看完整题目与答案
【多选题】组托操作时,必须注意的事项有( )。
A.
禁单人搬托盘
B.
禁止脚踩托盘
C.
禁止野蛮堆码
D.
禁止超重搬货
E.
禁止倒置货物
查看完整题目与答案
【多选题】下列做法对训练学生自我编辑和自我订正有帮助的是
A.
建立查错清单
B.
鼓励学生明白订正符号
C.
给学生一系列指导性问题
D.
指出学生的错误，让他们研究是何种类型的错误
查看完整题目与答案
【单选题】In the author’s mind, pay has much to do with ______.
A.
the position one holds
B.
one’s working years
C.
the demand and supply
D.
the size of the company
查看完整题目与答案
【判断题】微机唯一能够直接识别和处理的语言是汇编语言。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Paragraph 2: Questions 1. Who are the eligible readers of the books in the author’s mind?
A.
According to the author, they are adults who  like to read the masterpieces.
B.
According to the author, they are adults who have leisure time to read and would like to read the books.
C.
According to the author, they are adults who spend efforts in reading the book like Eliot's Adam Bede, even they finish it with a sign of relief.
查看完整题目与答案
【单选题】根据美国《道路通行能力手册》(HCM),基本通行能力与( )成正比
A.
车辆长度
B.
反应距离
C.
制动距离
D.
行驶车速
查看完整题目与答案
【简答题】In the author’s mind, what is the relationship between knowledge and imagination?
查看完整题目与答案
相关题目：
【单选题】根据《美国道路通行能力手册》(HCM),关于道路可能通行能力的修正系数的说法错误的是
A.
车道越宽，修正系数越大
B.
侧向净宽越大，修正系数越大
C.
车型越大，修正系数越大
D.
视距越大，修正系数越大
查看完整题目与答案
【判断题】计算机能够直接识别和处理的语言是汇编语言。
A.
正确
B.
错误
查看完整题目与答案
【单选题】In author’s mind, which one is not mentioned about writing?
A.
T o write is to transform that inward gaze into words.
B.
T o study the worlds into which we pass when we retire into ourselves.
C.
T o do so with patience, obstinacy, and joy.
D.
T o look out the window at the children playing in the street or at trees and a view, or even at a black wall.
查看完整题目与答案
【多选题】组托操作时,必须注意的事项有( )。
A.
禁单人搬托盘
B.
禁止脚踩托盘
C.
禁止野蛮堆码
D.
禁止超重搬货
E.
禁止倒置货物
查看完整题目与答案
【多选题】下列做法对训练学生自我编辑和自我订正有帮助的是
A.
建立查错清单
B.
鼓励学生明白订正符号
C.
给学生一系列指导性问题
D.
指出学生的错误，让他们研究是何种类型的错误
查看完整题目与答案
【单选题】In the author’s mind, pay has much to do with ______.
A.
the position one holds
B.
one’s working years
C.
the demand and supply
D.
the size of the company
查看完整题目与答案
【判断题】微机唯一能够直接识别和处理的语言是汇编语言。
A.
正确
B.
错误
查看完整题目与答案
【单选题】Paragraph 2: Questions 1. Who are the eligible readers of the books in the author’s mind?
A.
According to the author, they are adults who  like to read the masterpieces.
B.
According to the author, they are adults who have leisure time to read and would like to read the books.
C.
According to the author, they are adults who spend efforts in reading the book like Eliot's Adam Bede, even they finish it with a sign of relief.
查看完整题目与答案
【单选题】根据美国《道路通行能力手册》(HCM),基本通行能力与( )成正比
A.
车辆长度
B.
反应距离
C.
制动距离
D.
行驶车速
查看完整题目与答案
【简答题】In the author’s mind, what is the relationship between knowledge and imagination?
查看完整题目与答案
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