A bottle jack allows an average person to lift one corner of a 4000-lb automobile completely off the ground by exerting less than \(20 \mathrm{lb}\) of force. Explain how a 20-lb force can be converted into hundreds or thousands of pounds of force, and why this does not violate our general perception that you can't get something for nothing (a somewhat loose paraphrase of the first law of thermodynamics).