What is the coefficient of friction if the normal force of a laundry basket is 500N and the frictional force is 125 N?

Idon’t quite understand this problem

Which of the following are considered noble gases? a. bromine b. neon c. argon d. chlorine

Which is special about a dc circuit ? a. it has both series and parallel components b. it has only series or only parallel components c. charge moves in a single direction d. charge moves back and forth quickly