Skeptic123

A spherical Yo-Yo is released from rest 1.2 m above the ground. The Yo-Yo unwinds as it falls. What is the Yo-Yo's linear velocity right before it hits the ground? Use energy method.

A dentist's drill stars from rest and after 3.2 s it has an angular velocity of 2.51 * 10^4 rev/min.

A) Find the angular acceleration of the drill

B) Calculate the angle through which the drill rotates.

A mass of 8kg is resting on a horizontal table with a coefficient of kinetic friction of 0.35. the mass..?

is connected to a cable that passes over a pulley of mass 3.5 kg and radius 21cm. the other end of the table is attached to a second hanging mass of 15kg. the system is released from rest.

a) Calculated the acceleration of the system

b) How many times does the pulley rotate in 2 seconds?

Unsure how to apply angular equations to this problem.

A box of mass 30 kg is being dragged from rest up a frictional ramp by a rope with tension 500 N. The ramp has coefficients of static and kinetic friction of 0.5 and 0.3, respectively.

The angle of the box up the ramp is 25 degrees.

a) Calculate the net work done on the object if it moves 5 m up the ramp.

b) At the end of 5 m what is the box's velocity?

Hi folks I can't quite figure this problem out.

A car of mass 2000 kg is driving at 12 m/s. It turns the corner at an intersection. The radius of the path is 20 m. What does the coefficient of static friction have to be so that it will make the turn without sliding.

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I know that he Force centripetal is equal to mass * acceleration. Acceleration in this case would be V^2/r since it's a circle.

But I don't know how to use that to calculate the mu s.

Hi there I need some help with this question.

I understand the basic idea of it but I'm unsure how to calculate the advancing rocket's velocity as well as the man's own falling velocity given these equations.

y=yo + voy*t+.5ay*t

vy=voy+ay*t

vy^2=voy^2+2ay* change of y

If it was just the man falling to the ground then the first equation would be used with y=o as the ground. Then I could use the quadratic equation to solve for time.

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Mitch is skydiving. He jumps out of a plane and reaches a terminal velocity (constant velocity) of 20 m/s. When he is 1000 m above the ground, Skid, standing directly below Mitch, fires a rocket launcher at Mitch. The rocket has an initial velocity of 125 m/s.

a) How much time does Mitch have to figure out how to survive this predicament?

b) Assuming Mitch does not have his wits about him, at what location above the ground will the rocket intersect with him?

Right now it just displays "Site Name" in the mobile site even though I've tried changing it.

Hey there I'd like a step by step process if possible.

a)

e^4

f thing dx/ xsqrt(lnx)

e

b)

4

f thing xdx/ sqrt(1+2x)

0

I thought of maybe doing the substitution method as that's what we're covering in class but that only seems to apply to indefinite integrals. So I'm kind of stuck.

Thanks.

Hi there, I was thinking of importing a replica gun of a comic series I really love.

http://webshop.planetreplicas.com/epages/es140885....

However I recall that Cali has some weird laws about importing and brandishing props (orange caps)?

Can someone help clarify?

I know that I'm not the only one who's thought of this, but I don't recall any names addressing this issue.

When people think about how life exists in all its complexity, religious goers give the example of the clock and how everything is too complex to "not" be designed by a higher being and such. Things cannot happen randomly over time to create it and etc.

Now the hypothesis I've been thinking of would be the non believer's alternative to the watch scenario.

Instead of a blank canvas which a designer fills to create a masterpiece.

I think of it more as a mathematical formula, in which there are many ways to reach a certain answer. The answer is absolute but the processes which you can use to get there varies. And the process is accomplished by trail and error.

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Say we take the position of the earth which contains the only forms of life we know at the moment. Any closer to the sun and it would be too hot, any farther and it would be too cold. "Perfect" in an exaggerated sense of the word.

A religious man would claim that it's perfect therefore someone must have put it there.

I hypothesize that perhaps it has reached its perfect state due to there being no other option. If life could have formed closer or father from the sun then it would have. Essentially the result of a "perfect" earth location for life is due to there simply being no other option due to trial and error. If life could have existed elsewhere it already would.

Therefore earth location is not perfect but simply the result of options exhausted.

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Things become more complex and become more "perfect" in our eyes because all other options have either been already tried or lack the prerequisite to be fulfilled thus leading to the only choice left.

Since the only choice left is the only choice we have come to know, we see this only choice as the "perfect" choice.

The concept is similar to natural selection except that it applies to more than just the environment selecting mutations beneficial for life. It's that all options have already been exhausted leading to the next step. Since if a different option for progress was viable it would already have been taken.

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Sorry if the concept I'm trying to relate seems to be hard to get across.

This was more of an afternoon's thought, and communicating ideas of this nature with words over the internet things are lost in translation. As opposed to if we were sitting at a cafe discussing this where I could elaborate and clarify points of confusion.

P.S. While all answers are welcomes please don't say something random without explaining its significance. Example: 2nd Law of Thermodynamics without explaining what it has to do with the idea. Thanks.

Christian, Atheist, Muslim, Jewish, Buddhist, doesn't matter I want an opinion.

Just to see where people stand.

I recently bought a used tie and although in very good condition I can't help but notice that there is a very slight dirt stain on a part of it.

As if you take dried powdered dirt sprinkled some off your tie, then wiped it off.

So the stain is there, a little hard to see, but there.

Any advice how to clean it?

http://www.4degreez.com/misc/dante-inferno-test.mv

I apparently ended up in the 1st level of hell.

Limbo

Where the Virtuous Pagans and Virtuous non-believers reside.

If I wasn't so nice I'd end up in the 8th level with all the Heretics.

Of course by a political point of view.

Personally I prefer Cowboy Bebop, but this is coming from a guy who used to hate all forms of Anime in general.

http://img106.imageshack.us/img106/9206/0019dh1.jp...

The helmet seems pretty straightforward WW2 styled.

But that jacket is giving me some 2nd thoughts, and the idea of making it Green is strange too.

Anybody got any ideas?

I've looked quite a bit and it's pretty hard to find any solid info on what Belgium thought of Japan's invasion.

So I'm taking a bit of a leap of faith here, but I think that they pretty much had France's viewpoint.

Does anyone have more intimate knowledge about this?

Just want to get a general consensus on what people think of it.

If possible I would like to see a Yes on Prop 8 voter give me a real reason behind it that's just not a disguised version of homophobia.

I'll give you a hint. It's not Communism.

Ok not really.

Question is, how come there are so many young people in this section?

I would think our youngest person would be 16 and would go on from there.

But we're getting 13 year olds (actual number from someone who said so) and perhaps younger.

Don't you think that's a little young to be discussing religion in such a serious manner? I mean these kids are barely in control of their lives, not the say that they're even in a position to discuss such an important topic.

I mean sure, I bet there are teens who can argue the point. But I'm not seeing anyone near that intellectual level at that age in Yahoo Answers.