một dây dẫn được quấn một hình tam giác đều, mỗi cạnh là a = 50 cm. dòng điện chạy trong dây dẫn có cường độ I = 3,14A. tính cường độ của vector cảm ứng từ B và cường độ trường H tại tâm tam giác đó

What properties of a moving object are used in determining the object's energy of motion

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?

Review multiple-concept example 7 in this chapter as an aid in solving this problem. in a fast-pitch softball game the pitcher is impressive to watch, as she delivers a pitch by rapidly whirling her arm around so that the ball in her hand moves in a circle. in one instance, the radius of the circle is 0.626 m. at one point on this circle, the ball has an angular acceleration of 66.1 rad/s2 and an angular speed of 12.6 rad/s. (a) find the magnitude of the total acceleration (centripetal plus tangential) of the ball. (b) determine the angle of the total acceleration relative to the radial direction.