<div dir="ltr"><div class="gmail_default">
<p class="gmail-p1" style="font-family:arial,helvetica,sans-serif">On Sat, Jul 14, 2018 at 4:33 PM, Adrian Tymes <<a href="mailto:atymes@gmail.com">atymes@gmail.com</a>> wrote:</p>
<blockquote class="gmail_quote" style="font-family:arial,helvetica,sans-serif;margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><font size="4">> > Why couldn’t the same argument also be used to show you could get work out of the expansion of the universe?</font><br></blockquote><blockquote class="gmail_quote" style="font-family:arial,helvetica,sans-serif;margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"> </blockquote><blockquote class="gmail_quote" style="font-family:arial,helvetica,sans-serif;margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex">><i> Static friction,</i></blockquote>
<p class="gmail-p1"><font size="4">That was just one example, it you don't like friction then tie one end of a VERY long string to a bowling ball and the other to a bar magnet inside a solenoid, as the universe expands the ball will get further away and pull the magnet through the solenoid creating a electrical current that can do work. Or tie the string to the crank on a air compressor, as the air compresses it will get hot and you can use that to rum a heat engine; and the more the universe expands the colder the ultimate heat sink, empty space, becomes and that means the heat engine becomes more and more efficient. </font><span style="font-family:arial,helvetica,sans-serif"> </span></p>
<blockquote style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex" class="gmail_quote"><i>> Expansion of the universe seems likely to remain substantially weaker than most detectable gravitational waves.</i></blockquote><div> </div>
<font size="4">Not if the acceleration is accelerating, if it is we're heading for The Big Rip and that will be very detectable indeed, even atoms will be ripped apart and soon after that protons and neutrons.</font>
<p class="gmail-p1" style="font-family:arial,helvetica,sans-serif"><font size="4">John K Clark</font></p></div></div>