Category: History : What was the name of the B-29 used at Hiroshima to drop the bomb?

Questions

Condition of weather that occurs when the air temperature is below freezing?

Railway with two cars connected by a wire cable wound around a drum at the top of a steep hill?

Unit of measurement originating in Anglo-saxon England,equal to 220 yards?

Soft greenish grey rock resembling clay?

japanese Electronics company, worlds second biggest computer manufacturer behind IBM?