Tokyo stocks rose sharply Tuesday, with the Nikkei index briefly gaining over 2 percent, as the weakened yen versus the U.S. dollar prompted investors to widely buy back stocks that fell the previous day. The 225-issue Nikkei Stock Average ended up 674.30 points, or 1.80 percent, from Monday at 38,062.92. The broader Topix index finished 29.40 points, or 1.11 percent, higher at 2,670.54. On the top-tier Prime Market, gainers were led by pulp and paper, land transportation and nonferrous metal issues. The dollar strengthened to the lower 147 yen range in Tokyo, as the U.S. currency drew buying …