Each ordinance providing for the appropriation of money, or for an annual tax levy, or for improvements petitioned for by the owners of a majority of the foot frontage of the property benefitted and to be specially assessed therefor, and any emergency ordinance or resolution necessary for the immediate preservation of the public peace, health or safety, shall take effect, unless a later time be specified therein, upon its signature by the Mayor, or upon the expiration of the time within which it may be disapproved by the Mayor, or upon its passage after disapproval by the Mayor, as the case may be. No other ordinance or resolution shall go into effect until thirty days after its final passage by the Council. Each emergency measure shall contain a statement of the necessity for such emergency action and shall require the affirmative votes of at least five members of the Council for its enactment. No action of the Council in authorizing any change in the boundaries of the City, or the surrender or joint exercise of any of its powers, or in granting any franchise, or in contracting for the supply to the City or its inhabitants of the product or service of any utility, whether municipally owned or not, shall be taken as an emergency measure.