Một điện trở 5 ôm được mắc vào hiệu điện thế 6v nếu tăng hiệu điện thế ở 2 đầu điện trở ấy gấp 2 lần thì cường độ dòng điện chạy qua điện trớ đó tăng giảm thế nào

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

A10nc charge sits at a point in space where the magnitude of the electric field is 1500 n/c. what will the magnitude of the field be if the 10 nc charge is replaced by a 20 nc charge? assume the system is big enough to consider the charges as small test charges.

The particle p starts from rest at point a at time t = 0 and changes its speed thereafter at a constant rate of 2.8g as it follows the horizontal path shown. determine the magnitude and direction of its total acceleration (a) just before point b, (b) just after point b, and (c) as it passes point c. state your directions relative to the x-axis shown (ccw positive) and choose the angle with the smallest magnitude.