Unlike the idealized ammeter described in your text (section 25.4), any real ammeter has a nonzero resistance. (a) an ammeter with resistance ra is connected in series with a resistor r and a battery of emf and internal resistance r. the current measured by the ammeter is ia. find the current through the circuit if the ammeter is removed so that the battery and resistor from a complete circuit. express your answer in terms of ia, r, ra, and r. the more "ideal" the ammeter, the smaller the difference between this current and the current ia. (b) if r=4.50, e=8.25 v, and r=0.33, find the maximum value of the ammeter resistance ra so that ia is within 1.0% of the current in the circuit when the ammeter is absent. (c) explain why your answer in part (b) represents a maximum value.

Answer is c because in exothermic reactions, energy releases.in cellular respiration,atp+h20 (water) = adp+ pi + energyso celullar respiration is exothermic and releases energy

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.