<p>the velocity of the boy should be toward the dock
the velocity of the sled should be away from dock</p>
<p>how about the question that was saying what changed the velocity of the light in water or something??
the answer choices were something like…
frequency, angle of incidence, distance from light source</p>
<p>Wait, but if he’s stopped, why wouldn’t he and the sled be both moving in the same direction relative to the dock or not moving at all?</p>
<p>For the guitar string, velocity changes, (v = squareroot( TL / m)) and wavelength does not change (it is only a function of string length) and so, because f= v / wavelength, and wavelength does not change, frequency must also change. So velocity and frequency change with thickness (or more mass).</p>
<p>And I’m pretty sure the water and light question was angle of incidence? (■■■ got that wrong qq)</p>
<p>^^Velocity stays the same for all light in a vacuum, i think that was one of the questions. Also, there was one dealing with how frequency does not change through mediums but speed and wavelength do? And another wave question (optics) was about rainbows and the answer was it was similar to the dispersion of a glass prism.</p>
<p>wait what was the full question for the person and the sled when he stops?</p>
<p>^^ nope angle of incidence doesn’t change the velocity. I forget what the answer choices were but it was something to do with either the medium or frequency.</p>
<p>waiiit one of teh answer choices had to do with the medium??
like if medium changes velocity changes?? nooo way i must not have misread that question nuuuu</p>
<p>Azn: I think heygirl was talking about what affects the speed of the light when it passes from air into water :P. And do you remember what the speed/wavelength changing through a medium but not frequency question was about?</p>
<p>heygirl: Something along these lines:</p>
<p>A boy starts walking toward a point on a frictionless sled on ice. What happens to the velocity of the boy and the sled after he stops walking just before he reaches the end of the sled, relative to the point?</p>
<p>Ok… bad restatement of the problem, but the gist is still there.</p>
<p>Wait, I thought the medium they gave you was water for sure o.O.</p>
<p>I put frequency for that question, but my friend keeps telling me about Snell’s Law (lol ignorant me has no clue what that is) and the angle of incidence…</p>
<p>i put angle of incidence but then liike…how would that affect the velocity…
idkkkkk IM GETTING CONFUSED
WHAT ABOUT THE SPHERE ROTATING ONE
.___.</p>
<p>what’s 5 wrong?</p>
<p>Was that the one with the electron beam fired into it? I put speed for that…</p>
<p>wait for the person/sled one
doesnt it kind of depend on who is heavier? if person is heavier than the sled, they should be going toward/toward</p>
<p>the kettle drum with the beam of particles was velocity because you know angular velocity and distance it covers, from that you can find time, thus velocity/speed</p>
<p>im taking physics C for both, and this test was way harder than C elec
I even used Biot’s law to sove one problem , doing integration lol…</p>
<p>daaaaaaaaaaaarn it i think i put momentum ]]]]:<</p>
<p>the question about light striking a medium barrier and reflecting - the answer was frequency affects velocity and this is why:</p>
<p>under normal circumstances, a refracted ray doesn’t not change in frequency, but rather in wavelength. however, this particular question asked: what would change the speed, so irrespective of the medium, if you manually change the frequency, the speed increases, so this is the answer</p>
<p>whyd you use the bio-savart law? I didnt see any need</p>