Trong không khí, đặt hai điện tích q1 = 4.10- 8 (C) và q2 = - 3.10- 8
(C) tại 2 điểm A, B cách nhau
30cm và điện tích q = 10- 8
(C) đặt tại M. Tính độ lớn lực tĩnh điện tổng hợp do q1 ,q2 sinh ra tác dụng lên
q trong các trường hợp sau :
a) M là trung điểm cuả AB
b). MA = 40cm, MB = 10cm.
c) Tam giác AMB vuông cân, góc M vuông.

When your appreciate the opinions of other teammates you show

Which sentence is punctuated correctly?  a.under a microscope; the organisms look a bit like ruffled tennis balls they have armored plates that fit together to make a round shape. b.when the water is disturbed; the organisms respond by glowing this makes swimmers look like floating beams of blue light. c.there is a bay in puerto rico that seems to light up at night; the light comes from tiny organisms in the water. d.the luminescence attracts visitors from around the world people are curious to see; this beautiful otherworldly sight.

In  the earth is precious, chief seattle says that man did not “weave the web of life, he is merely a strand in it.” what attitude is he implicitly criticizing by saying this?