Coil the wire around the nail. connect one end of the wire to the positive battery terminal. connect the other end of the wire to the negative battery terminal. what has been made by making this series circuit? a. a stronger battery b. an electromagnet c. a galvanometer d. an electric nail

Will you chech and finish these for me, because i am stumped with them.

(a) assume the equation x = at^3 + bt describes the motion of a particular object, with x having the dimension of length and t having the dimension of time. determine the dimensions of the constants a and b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.) (b) determine the dimensions of the derivative dx/dt = 3at^2 + b. (use the following as necessary: l and t, where l is the unit of length and t is the unit of time.)

Select all the correct answers. which changes will increase the rate of reaction during combustion? decreasing the area of contact between the reactants adding more oxygen to the reaction removing heat from the reaction changing the reactants from solid form to powdered form lowering the exposure of the reactants to air