Một electron, được gia tốc bởi hiệu điện thế 400V bay vào một từ trường đều có cảm ứng từ B=1.5.10-3T.
Phương của vận tốc vuông góc với phương của đường sức
từ. Hãy xác định bán kính quỹ đạo của electron

Identify the forces that contribute to the centripetal force on the object in each of the following examples: a. a bicyclist moving around a flat, circular track b. a bicycle moving around a flat, circular track c. a racecar turning a corner on a steeply banked curve

The place you get your hair cut has two nearly parallel mirrors 6.00 m apart. as you sit in the chair, your head is 2.00 m from the nearer mirror. looking toward this mirror, you first see your face and then, farther away, the back of your head. (the mirrors need to be slightly nonparallel for you to be able to see the back of your head, but you can treat them as parallel in this problem.) how far away does the back of your head appear to be?

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body