Nike's 2nd-Quarter Earnings Jump  NEW YORK (Reuters) - Nike Inc. &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=NKE.N target=/stocks/quickinfo/fullquote"&gt;NKE.N&lt;/A&gt; on Thursday said its  second-quarter earnings rose a surprisingly large 46 percent on  strong sales in the United States and in emerging markets like  China, while a weaker dollar beefed up profits in Europe.