<p>post the number of the problem and the year from which it comes from to receive explaination</p>
<h1>58 from 1998</h1>
<p>bump bump does anyone know how to do this problem im having trouble</p>
<p>whats the problem?</p>
<p>the product of
2 ampsx 2 voltsx 2 seconds is equal to</p>
<p>8 coulombs
8newtons
8joules
8calories
8 newtonamperes</p>
<p>oh that one
think of it this way</p>
<p>amps is units of C/s, volts is J/C, and seconds is s so put it into those units, the C cancel, the s cancel, and u are left with 8 Joules</p>
<p>or</p>
<p>P=IV and Energy =IVt so its 8 Joules</p>
<p>whichever way u like</p>
<p>im going to post more problems so those that have questions on these tests can have them answered</p>
<p>the planet mars has a mass of 6.4 x 10^23 and radius of 3.4x10^6 what is the acceleration in freefall</p>
<p>and can anyone please explain to me these pv work diagrams like in questions 22 and 23 for 1998</p>
<p>C. 8 joules?</p>
<p>Fg=GM1M2/r2 so</p>
<p>mg=GM1M2/r^2</p>
<p>so g on Mars= G M of mars/r^2</p>
<p>g= (6.67x10^-11)(6.4x10^23)/(3.4x10^6)^2</p>
<p>and this problem of the following, which is the best estimate of the work done by the magnetic field on the protons during one complete orbit of the circle</p>
<p>0 J
10^-22 J
10^-5 J
10^2 J
10^20 J</p>
<p>0000000000000000000000000000000000 J</p>
<p>but why is it 0 joules</p>
<p>W=F*d</p>
<p>d=displacement</p>
<p>in a circle displacement is 0, hence no work</p>
<p>o yea and one more question</p>
<p>a muon with a lifetime of 2x10^-6 second in its frame of reference, is created in the upper atmosphere with a velocity of 0.998 c toward the earth the lifetime of a muon as measured by an observer on earth is most nearly</p>
<p>3x10^-2
^-3
^-4
^-5
^-7</p>
<p>58 </p>
<p>mg + Mgcos60 = 2Mg
mg = 2Mg - Mg/2
mg = 3M/2
C Q.E.D</p>
<p>dude thats relativity, dont need to know that for physics b, they took it out</p>
<p>and i would assume that angular momentum is no longer on it</p>
<p>torque, torque equilibrium and one thing about angular momentum, as length decreases, velocity increases for angular momentum</p>
<ol>
<li>for 1998</li>
</ol>
<p>what is the kinetic energy of a satellite of mass m that orbits the Earth, of mass M in a circular orbit of radius R</p>
<p>The disk-shaped head of a pin is 1.00 mm in diameter. Which of the following is the best estimate of the number of atoms in the layer of atoms on the top surface of the pinhead?</p>
<p>A. 10^4
B. 10^14
C. 10^24
D. 10^34
E. 10^50</p>