A person of mass mp is standing on a rung one third of the way up a uniform ladder of mass ml and length d. The ladder is inclined at an angelof 0° with respect to the horizontal. Assume there is no friction between the ladder and the wall but there is friction between the base of the ladder and the floor with a coefficientof static friction. Fins the minimumcoefficientof frictionbetweenthe ladder and the floor so that the person and the ladder do not slip.

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2