Answer: Lubrication
Moving parts of early machines were able to run because of the application of a lubricant such as oil, vaseline or grease.
The history of lubrication has advanced into a discipline known as tribology, which studies interactions between the moving parts of a machine.
By studying friction, wear, and lubrication, engineers are able to design bearings that prolong the useful life of rotating machinery.
1. The United States government had hardly any military resources with which to fight a major war.
2. The British ranked as the world's greatest maritime power, but the U.S. Navy did not possess a single ship of the line, as battleships of the day were called. The Americans had only eight frigates and eight smaller seaworthy warships.
3. The government had made no naval measures along the most strategically significant of the waterways bordering Canada-Lakes Champlain, Ontario, and Erie.
He enacted policies of glasnost (“openness”) and perestroika (“restructuring”), and he pushed for disarmament and demilitarization in eastern Europe. Gorbachev's policies ultimately led to the collapse of the Soviet Union in 1990–91. Learn more about this Russian political party.
Answer:
C. Middle-class Americans had more free time and money to enjoy leisure activities.
Explanation:
Answer:
africans were hard workers,coudnt stop slave traders.there was alot of africans
Explanation: