Một vật trượt xuống một phương nghiêng có hệ số ma sát μ = 0,5. Tìm góc θ nếu độ nghiêng của phản ứng bình thường gấp đôi
lực hướng xuống dọc theo phương nghiêng.

Answer: 1.4 seconds which is the third optionexplanation: current is defined as the flow of charge per timetherefore, the equation that relates current, charge and time can be expressed as follows: i = δq / δtwhere: i is the current given = 1.8 ampereδq is the charge given = 2.5 coulombδt is the time required for the flow of the given charges to give the 1.8 ampere.substitute with the givens in the above equation to get the time as follows: 1.8 = 2.5 / δtδt = 2.5 / 1.8 = 1.38888 which is approximately 1.4 secondshope this was !

D. a  bar magnet with its south pole on the left