In the horizontal direction, the forces acting on the person are
• friction with magnitude <em>f</em>, opposing motion, and
• the horizontal component of the pulling force (itself with mag. <em>p</em> ) with mag. <em>p</em> cos(30º), in the direction of motion.
There is no friction in the vertical direction, so we omit any discussion of the vertical forces.
By Newton's second law, we then have
<em>p</em> cos(30º) - <em>f</em> = <em>m</em> <em>a</em> cos(30º)
where <em>m</em> is the person's mass, and <em>a</em> is their acceleration so that <em>a</em> cos(30º) is the magnitude of the horizontal component of acceleration. The person is pulled by a force of <em>p</em> = 401 N, so solve for <em>f</em> :
(401 N) cos(30º) - <em>f</em> = (53 kg) (0.59 m/s²) cos(30º)
<em>f</em> ≈ 320 N
<span>N-type
semiconductor materials have been with elements which have spare
electrons in their outer shells. This gives N-type silicon free
electrons (which are negatively charged partials) which can move about
at will - with the potential to create current.
P-type semiconductor materials have been in the opposite way, with
elements that have too few electrons in their outer shells. Therefore
the opposite of electrons - holes - are free to move about within the
material - with the potential to create current.
You can think of it like positive and negative poles of a magnet.
When you place a piece of N-type silicon next to a piece of P-type
silicon, they form a diode. The excess electrons in the N-type are
attracted to the excess holes in the P-type, forming what is known as a
P-N junction. If you then put a potential difference (voltage) across
the junction such that the P-type is sufficiently higher potential than
the N-type, electrons will be able to jump across the boarder from the
N-type to the P-type, creating current in the opposite direction.
If you apply the potential difference in the opposite direction, such
that the N-type is at a higher potential than the P-type, there is no
flow of electrons from the P to the N-type because the N-type already
has too many. There is no current flow.
</span>
If energy could<span> be created or </span>destroyed<span>, all of our ideas of how the world works ... Historically, of course </span>not<span> all the forms of energy were known to begin with. ... too messy or complicated to make sense, we </span>would have<span> had to give up the law. ... </span>can<span> be converted into rest </span>mass<span> and back again (particle physicists </span>do<span> this </span><span>every )</span>
When a positive rod is placed to the right of sphere B, and the spheres are separated, the reason behind this is the same charge on the sphere as the rod i.e. the right of the sphere also had a positive charge. Thus, the same positive charges could not reside on the right side surface of the sphere due to which it separation happens.
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Answer:
Explanation:
First ship starts at Noon with speed 20 Knots towards West
now we know that 2nd ship starts at 6 PM with speed 15 Knots towards North West
so after time "t" of 2nd ship motion the two ships positions are given as
now we can find the distance between two ships as
now we have
now we will differentiate it with respect to time
here we know that
so we have
now we have
