<p>it was asteroid because length contracts near high speeds</p>
<p>I’m just gonna throw everything i remember:
- Work-> Fd, Mgd, (1/2)mv2, which ones are right?
- Doppler’s effect one (respectively moving?)
- formula x+vo+(1/2)at2 used?? (inclined plane?)
- Magnetic force picture (+ on top, - on bottom and circles goin around in the middle clockwise)
- Energy: given 4.14+10^(-17) wave length, calculate the E value using Plank’s constant h (is the answer on this 4eV?)
- Bohr’s atom…the energy state one?? (I don’t remember the exact answer I put down nor the choices given)
- half life of some element in 12 min, who has half life of 4 (1/16 of original?)
- Vector: on this mass swining circularly…i don’t remember further, other than somethin perpendicular
- Diagram vector: someone draggin the box. (f [friction] arrow opposite of F, N goin up and mG goin down?)
- the pluto one… (it has higher velocity near the earth(or sun?) and somethin about potential being also true?)
- The piston one: with constant volume (when pushed in, temperature rises?)
- conduction, convection and radiation of a bulb inside of a box? (I put convection and radiation…)
- devices that stores charge (capacitors)
- E- field diagram with q1 and q2 (2 charges have similar magnitude but different charges?)
- EM induction: (relative movement btw coil and magnet?)
THIS IS ALL I REMEMBER SO FAR!!! any comments? please match it up and tell me how I did…:(</p>
<p>“it was asteroid because length contracts near high speeds” </p>
<ul>
<li>only from the perspective of people on earth. But if you measure from the other perspective, it goes the opposite way. It’s the highest spped asteroid.</li>
</ul>
<p>Hey anyone remember the last answer?? Was it 1/6 or 1/3600… Common knowledge tells me it’s 1/6 but when you plug in the values for g and find the ratio it comes to 1/3600:-</p>
<p>g=GM/R^2 both the GM’s cancel and your left with 1/60^2 = 1/3600
(i know this is wrong but can some1 explain please)</p>
<p>tetrahedr0n <— I put .8C one…is that the one ur talkin about?</p>
<p>tetrahedr0n, I believe you seem to be missing out on one of the most important principles of physics. Pretend the ship going at .8c is still. It measures the asteroid going by at .8c. All motion is relative.</p>
<p>L= L_o*sqrt(1-(v^2/c^2))</p>
<p>1-(v^2/c^2) will always be a number less than or equal to 1, so length contracts.</p>
<p>Yes, this means that the person on the asteroid sees the ship contracting, and a person on the ship sees the asteroid contracting.</p>
<p>EDIT: For clarification, a person on the asteroid is moving with the asteroid, and therefore there is no relative motion between the two. He is measuring the actual length.
L=L<em>o*sqrt(1-(0/c^2))
L=L</em>o<em>sqrt(1)=L_o</em>1=L_o.</p>
<p>Hope this helps!</p>
<p>Olo is right. Asteroid has the longest length, all other views spot contraction.</p>
<p>Checkmeout: I also got 1/3600, but I was also iffy on that question. I think it makes sense though. When you cleave the distance between people in 2, the Fg between them increases by a factor of 4.</p>
<p>I’m no expert, but…</p>
<p>
Fd and 1/2mv^2. The force Mg is perpendicular to the displacement and thus becomes zero. You’ll remember Work is equal to the dot product of F and s, or Fscos(theta). In this case, theta = 90, and cos(90)=0.
[/quote]
</p>
<p>
The source and the observer must be moving relative to eachother (this is why a car sounds different when it’s approaching you than when it’s leaving you, but if you’re moving in traffic, the cars more or less sound the same).</p>
<p>
An inclined plane has a constant acceleration, which is what the equation can be used for. You are correct.</p>
<p>
I don’t remember the actual diagram, so I can’t say. Anyone?</p>
<p>
Wavelength * frequency = speed (c). You can solve for frequency by dividing c by the wavelength, and then can calculate the energy by multpying c/(lamda) by Plank’s constant, h. 4eV is correct. </p>
<p>
Bohr’s model of the atom depicts discrete energy shells in which electrons reside.</p>
<p>
If the half life is three minutes, and four half lives elapse. .5^(4) = 1/16, so yes, that is correct.</p>
<p>
I don’t know which one you’re talking about? The one with the tangential vs. radial accelerations? </p>
<p>
That is correct. Friction opposes motion, and the Normal force is the reactionary force to the box’s weight.</p>
<p>
Keppler’s law indicate that equal areas are swept out in equal times, thus when any object is closer, it covers a greater arc (to maintain the same area).</p>
<p>
The ideal gas law states that PV = nRT, rearrange it to T = PV/nR. n and R are constant in this case. Because pressure and volume are inversely related, as one goes down, the other will go up. You are not sure that the temperature may rise. Add heat.</p>
<p>
Conduction only occurs through contact, and convection through heating of a gas. The air was removed, so the only heat dissipated is through radiation.</p>
<p>
Indeed.
If they had the same number of lines, and one was pointing to the other (not pushing away), then yes, they were equal and opposite.</p>
<p>
Indeed, in order to have induction, the coil and magnet must be moving relative to eachother, cutting across EM lines.</p>
<p>Yeah but on the moon g is 1/6</p>
<p>Chekmeout: You are thinking of the acceleration of an object on the moon. The question asked what the acceleration of of entire moon was in respect to the earth’s gravity.</p>
<p>1/3600 would have been correct.</p>
<p>Olo - you are right. I understand the concept, but I am switching the formula.</p>
<p>It’s okay man, you’ll get it next time. :)</p>
<p>yes everything is good so far…and moon is 1/6 jsut to clarify and thbe thing was asteroid (refer to the great explanation by OLO)</p>
<p>thanks…if anyone rmbrs anymore keep posting I’m lovin this</p>
<p>I just remembered one…what did you guys put for the one that had like in the beginning of test…there were different vector diagrams one with circle, and then two with forces like 200 N and 100N on different sides of a mass.</p>
<p>I forget the question but if anyone rmbrs please share</p>
<p>Rupang:
- for the one regarding making the area of a diffraction pattern larger… recall that nlambda = d sin(theta), or nlmabda/d = sintheta. We are trying to maximize theta, thus increasing both the wavelength and decreasing the width of the hole will do this.
- for the question with the curent going from + to - forming concentric circles of magnetic field, I believe i put the same answer as you, however the direction was anticlockwise in the drawing.</p>
<p>Merudh:
- regarding the questions with the circle diagram and two bock diagrams, the one with the applied force greater than the frictional force had the net force in the direction of velocity. The one with the friction > applied had the net force opposing the velocity. The circular motion had the net force perpindicular to the velocity of the ball. </p>
<p>What did you put for the one regarding finding the resitance of a resistor? I said putting the v meter across the resistor (to find voltage drop) and the ameter in series with the resistor (to find current) then you can do v = ir, solve for r… is that correct?</p>
<p>yeah ammeter with series and voltmeter should be parallel.
for that magnetism one that you just mentioned what was the letter of the answer…was it B or something</p>
<p>SNAKE (Series) current and POWER (parallel) voltage
that’s how I rmbred that…not that it matters now anyway lol</p>
<p>Adimeola: That is correct. A voltimeter is wired in parallel and an ameter in series.</p>
<p>Thanks.</p>
<p>Merudh, I do believe it was B.</p>
<p>YES!!! lol</p>
<p>anythin else important?</p>