trên cùng 1 đường thẳng có 2 xe chuyển động đều và cùng chiều, xe B đuổi theo A. Ban đầu 2 xe cách nhau 20km và chuyển động cùng lúc. Xe A chạy với tốc độ 40km/h. Xe B muốn đuổi kịp xe A chỉ trong 20p phải chạy với tốc độ là

An charge with mass m and charge q is emitted from the origin, (x, y)=(0,0). a large, flat screen is located at x=l. there is a target on the screen at y position y(h), where y(h) > 0. in this problem, you will examine two different ways that the charge might hit the target. ignore gravity in this problem. 1.assume that the charge is emitted with velocity v(0) in the positive x direction. between the origin and the screen, the charge travels through a constant electric field pointing in the positive y direction. what should the magnitude e of the electric field be if the charge is to hit the target on the screen? express your answer in terms of m, q, y(h), v(0), and l. 2.now assume that the charge is emitted with velocity v(0) in the positive y direction. between the origin and the screen, the charge travels through a constant electric field pointing in the positive x direction. what should the magnitude e of the electric field be if the charge is to hit the target on the screen? express your answer in terms of m, q, y(h), v(0), and l.

To a of 4 x hz is 1. 0. mm nm nm

Amagnetic field applies forces on: a)static chargesb)moving chargesc)water flow