<p>I put only Intensity because the formula I=P/4pir^2 directly relies on distance from source. I zoned in on the word the source was “stationary” so that probably meant Doppler effect was invalid so frquency and wavelength are constant. Different thoughts?</p>
<p>yea it doesnt actually change
it’s just observed differently if either the source, the observer, or both is/are in relative motion</p>
<p>what happens when you put a neutron in a magnetic field (or was it an electric field?)</p>
<p>the proton spins around in a helix, but does the radius of revolution get smaller (D) or remain the same throughout (e)
I doubt a proton can lose momentum if a constant force (either magnetic or electric, can’t remember) is acting on it</p>
<p>i said it would get smaller, and i think i left the neutron blank lol i wasnt sure</p>
<p>dasheeky - electric field, and I put no.
I was confused on the same things as you, guessed the same answers though haha.</p>
<p>I put that waves cancel each other if they’re 180 degrees out of phase.</p>
<p>I agree with shellpell that it’s 37 counts/min.</p>
<p>Well, since the acceleration is perpendicular to the component of velocity, I thought it was a spiral with constant radius. The neutron should continue in a straight line.</p>
<p>what force compels the neutron to move in an electric field if it is neutral?</p>
<p>oh and also, does anyone remember the question with</p>
<p>A and v both pointed up, V up and A down, and V up and A to the side?
acceleration and velocity</p>
<p>^I thought that all three were possible.</p>
<p>bravosix - the third one was impossible, because direction of v and a must be same to be consistent with a = v/t no?</p>
<p>centripetal motion has velocity tangent and acceleration not parallel to it</p>
<p>dasheeky, yea that was the second one. the third one showed a and v to be in opposite directions though.</p>
<p>oh that’s easy
the thing is deccelerating</p>
<p>Well I’m not so sure what it’s asking. In any case, a = (delta)v/(delta)t. In other words, it’s the change of speed, not the absolute value of the speed. I just assumed that it was asking what is possible, in which all three should be.</p>
<p>2 + balls were affected by gravity, tension of the string, and electrostatic repulsion because both were positive right?</p>
<p>^Yea, for that one I put all three</p>
<p>For the ball hanging from a string, F1 = F2 = F3 = F4?</p>
<p>And after the string is cut, F1 (the force of string on ball) = F2 (force of ball on string) = 0?</p>
<p>isn’t there another choice because the ball and teh string still have gravitational attraction</p>
<p>and were there other choices for the first one?</p>
<p>It asked which forces were zero when the string is cut. Gravity is acting on the string and ball, but the string and ball are in free-fall and aren’t acting forces on each other. So I put F1 and F2 to be equal to zero.</p>
<p>Did anyone else get (v^2)/2g</p>
<p>bravosix - I got the same for H peak, don’t really remember what the string ball was asking. I remember putting down F3 and F4 for the gravitational potential e that did exist.
btw. Which ones result from energy being quantized for electron: alpha dcay, isotopes, line spectra?</p>
<p>just line spectra i think</p>
<p>did anyone remember anything about Jupiter
it’s faster around the sun
but anything else?</p>
<p>and does anyone remember the question about the orbit velocity
like you had to substitute an entire chunk for GMplanet/R</p>
<p>About one of the last questions with the mirror: Actually I believe that he can see everything of his body (except maybe his toes) Remember, the mirror is half as high as the person, and the upper end of the mirror is at the same level of the head. Now the person looks at the bottom end of the mirror. Because angle of inflection = angle of deflection, he will see all parts of his body which are as far from the bottom of the mirror as his eyes are - so almost everything. This also doesn’t change if the person moves farther away or closer to the mirror.</p>