Originally posted by epiccJamess
Why can't i fly
why
My guess would be you're too fat and can't afford two seats.
Originally posted by Just4Hax
What are your thoughts on the Higgs boson? And what exactly does that mean, I think I get the basic basic jist of it.
Detection of the Higgs boson is essentially one of the only ways of experimentally confirming the Higgs mechanism, which is an essential part of the Standard Model. The Higgs mechanism is essentially this: particles interact with the Higgs field (a scalar field*) and how strongly they interact with it determines its mass. The Higgs boson is an excitation** of the Higgs field, just like the photon is an excitation of the electromagnetic field. The reason the Higgs is so hard to detect is because of its mass - it's extremely massive for a fundamental particle. The more massive the particle, the harder (more energy required, i.e. E=mc²) it is to create. It also decays very rapidly.
*Scalar field - every point in space (x,y,z) is assigned a value Φ. Basically, you tell me the point P=(x,y,z) that you're talking about, and I'll tell you the corresponding value Φ.
**Excitation - basically the field is "excited" or more energetic. A part of the field becomes energetic and sort of "breaks off" as a particle.
Originally posted by RedFlowz
A football is kicked at an 50 degree angle to the horizontal , travels a horizontal distance of 20m before hitting the ground. What is the initial speed?
Well, the vertical distance from the ground as a function of time is the following:
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So to find the time t at which the ball hits the ground, we simply set y(t)=0:
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Now, the horizontal distance is given by:
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So now we simply plug in the time we found above to get the horizontal distance the ball it traveled when it hit the ground:
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(I made use of the fact that 2sin(x)cos(x)=sin(2x).) Now we simply solve for the initial velocity in terms of the angle and distance traveled:
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If you plug in 50 degrees for θ and 20m for x, you should get approximately v_0=14.1 m/s^2.