Hai điện tích điểm bằng nhau đặt trong chân không cách nhau một khoảng R1 = 4 cm lực đẩy giữa chúng là F1 = 9 nhân 10 mũ trừ 5 niutơn để lực tác dụng giữa chúng là F2 = 1,6 nhân 10 mũ trừ 4 n thì khoảng cách R2 giữa điện tích đó phải bằng bao nhiêu

When considering gravity acceleration and the force of acceleration, what must be true? a. the direction of acceleration must be perpendicular to the direction of the force. b. the direction of the force and the direction of acceleration must be the same as each other. c. the direction of the force and the direction of acceleration must be opposite of each other. d. the mass of the body must be the same as the acceleration of the body.

The air that we breath is made mostly of which gaseous molecule

Aplayground merry-go-round has a radius of 4.6 m and a moment of inertia of 200 kg-m2 and turns with negligible friction about a vertical axle through its center. a child applies a 26.0 n force tangentially to the edge of the merry-go-round for 15.0 seconds. if the merry-go-round is initially at rest, how much work did the child do on the merry-go-round?