Question

求翻译啊求翻译，英文版物理题

8.A long thin wire ,hundreds of meterslong,carries a uniformly distributed charge of -2.8uC per meter oflength.What are the magnitude and direction of the electric field at point(a)5.0m and (b)2.0m from the wire?
9.A point charge of 3.5nC is located at theorigin and a second charge of -5.0nC is located on the x axis at x=1.5m .Calculate the electric flux through a sphere centered at theorigin with radius 1.00m .Repeat the calculation for a sphere of radius 2.00m .
10.A spherical cavity of radius 4.50 cm is at the center of a metal sphere of radius 18.0 cm.A point charge Q=5.50uC rests at the verycenter of the cavity,whereas the metal conductor carries no netcharge.Determine the electric field at a point(a)3.0 cm from the center of the cavity and (b)6.0 cm from the center of the cavity.
11.Amotorboat whose speed in still water is 3.70m/s must aim upstream at an angle of the 29.5°
(with respect to a line perpendicular to the shore) in orderto travel directly across the stream.(a)What is the speed of the water?(b)Whatis the resultant speed of the boat with respect to the shore?

Answer 1

8。一个长薄丝，几百米，进行均匀分布的电荷的-2.8uc每米长度。什么是大小和方向的电场在点（a）5.0m和（B）2.0m线？
9.A point charge of 3.5nC is located at theorigin and a second charge of -5.0nC is located on the x axis at x=1.5m .Calculate the electric flux through a sphere centered at theorigin with radius 1.00m .Repeat the calculation for a sphere of radius 2.00m .
9。点电荷3.5nc是位于起源和第二电荷-5.0nc位于X轴在x = 150万。计算电通量通过球体中心半径1.00m起源。球体半径2.00m重复计算。
10.A spherical cavity of radius 4.50 cm is at the center of a metal sphere of radius 18.0 cm.A point charge Q=5.50uC rests at the verycenter of the cavity,whereas the metal conductor carries no netcharge.Determine the electric field at a point
10。球形空腔的半径为4.5厘米是在一个金属球体的半径为18.0厘米的中心。一个点电荷Q = 5.50uc休息在verycenter腔，而金属导体进行无netcharge。确定在一个点的电场
(a)3.0 cm from the center of the cavity and (b)6.0 cm from the center of the cavity.
（一）3厘米，从中心的空腔和（乙）6厘米从中心的空腔。
11.Amotorboat whose speed in still water is 3.70m/s must aim upstream at an angle of the 29.5° (with respect to a line perpendicular to the shore) in orderto travel directly across the stream.
11。amotorboat的速度还有水3.70m/s必须瞄准上游在29.5°角（相对于垂直于海岸线），旅游直接越过小溪。
(a)What is the speed of the water?(b)Whatis the resultant speed of the boat with respect to the shore?
（一）水的速度是多少？（b）是相对于岸边的船的合速度？

Answer 2

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