Nvidia investors are facing potentially bearish developments on multiple fronts.Nvidia (NVDA -8.91%) stock is getting hit hard in Tuesday's trading. The semiconductor company's share price was down 8.7% as of 2:15 p.m. ET, according to data from S&P Global Market Intelligence.The artificial intelligence (AI) leader's share price is falling in response to rising concerns about the health of the U.S. economy. News out of China and other geopolitical dynamics are also prompting sell-offs for Nvidia and other c ...