document.write( "<A HREF=/cgi-bin/jump-to-question.mpl?question=344429>Question 344429</A>: <I><SPAN STYLE=\"word-break: break-all;\"> can you show me how to work these out please:\r<BR>\n" );
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document.write( "1) The formula S=4 &#960; r2 gives the surface area of a sphere of radius r. Jupiter’s radius is 71 492 000 metres. Use the formula t0 estimate the surface area of Jupiter. \r<BR>\n" );
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document.write( "2) Atomic particles: Atoms are made up of protons, neutrons and electrons. The mass of a proton is 0.000 000 000 000  000  000  000 000  001 673kg. <BR>\n" );
document.write( "   This is 1836 times as heavy as an electron.<BR>\n" );
document.write( "   What is the mass of an electron? <BR>\n" );
document.write( "    How many protons are needed to make a mass of 1kg?\r<BR>\n" );
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document.write( "3)  The wave length of red light is 7x10-7 m and that of violet light is 4x10-7<BR>\n" );
document.write( "          Metres. What is the difference between these wavelengths </SPAN>\n" );
document.write( "</I><HR><TABLE width=100%><TR><TD><B><A HREF=http://www.algebra.com/>Algebra.Com's</A> Answer #246443 by </B><A HREF=/tutors/aboutme.mpl?userid=Alan3354><B>Alan3354(69443)</B></A><img src=\"/images/stars/stars-13.gif\" alt=\"\" >&nbsp;<A HREF=/tutors/aboutme.mpl?userid=Alan3354><IMG SRC=http://www.algebra.com/images/aboutme-small.gif BORDER=0 alt=\"About Me\" VALIGN=MIDDLE></A>&nbsp;<IMG SRC=http://www.algebra.com/cgi-bin/show-face.mpl?user=Alan3354><BR>You can <A HREF=\"/cgi-bin/embed-solution.mpl?show=1&solution=246443\">put this solution on YOUR website!</A><BR><SPAN STYLE=\"word-break: break-all;\"> can you show me how to work these out please: <BR>\n" );
document.write( "1) The formula S=4 &#960; r2 gives the surface area of a sphere of radius r. Jupiter’s radius is 71 492 000 metres. Use the formula t0 estimate the surface area of Jupiter. <BR>\n" );
document.write( "Sub the number for r<BR>\n" );
document.write( "<IMG STYLE=\"max-width:80%;\" SRC=/cgi-bin/plot-formula.mpl?expression=Area+=+4%2Api%2A%2871492000%29%5E2 ALIGN=MIDDLE  ALT=\"Area+=+4%2Api%2A%2871492000%29%5E2\"   DISABLED_style= \"max-width:90%; height:auto;\" ><BR>\n" );
document.write( "Do it with a calculator.<BR>\n" );
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document.write( "2) Atomic particles: Atoms are made up of protons, neutrons and electrons. The mass of a proton is 0.000 000 000 000 000 000 000 000 001 673kg. <BR>\n" );
document.write( "This is 1836 times as heavy as an electron.<BR>\n" );
document.write( "What is the mass of an electron?<BR>\n" );
document.write( "Mass of the proton is 1.673E-27 kg<BR>\n" );
document.write( "Mass of the proton = 1.673E-27/1836 = 16730E-31/1836<BR>\n" );
document.write( "=~ 9.112E-31 kg<BR>\n" );
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document.write( "How many protons are needed to make a mass of 1kg?<BR>\n" );
document.write( "# = 1/mass =~ 5.977E26 protons/kg<BR>\n" );
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document.write( "3) The wave length of red light is 7x10-7 m and that of violet light is 4x10-7<BR>\n" );
document.write( "Metres. What is the difference between these wavelengths<BR>\n" );
document.write( "7E-7 - 4E-7 = 3E-7 (or 3*10^-7) meters<BR>\n" );
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