một electron bay vào trong không gian có từ trường đều có cảm ứng từ B = 0.2 với vận tốc ban đầu v0 =2×10∧5 m/s vuông góc với vec tơ B lực lorenxo tác dụng vào electron có độ lớn là

Apositive point charge q is fixed on a very large horizontal frictionless tabletop. a second positive point charge q is released from rest near the stationary charge and is free to move. which statement best describes the motion of q after it is released? assume q stays on the table

Pls pls pls pls ! describe, in your own words, how you found the epicenter of the earthquake.

Write the function getkthdigit(n, k) that takes a possibly-negative int n and a non-negative int k, and returns the kth digit of n, starting from 0, counting from the right