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seen Aug 27 at 15:44

Sep
21
awarded  Yearling
Dec
1
comment How to get energy of collision if you know force of gravity of an object($m \rightarrow F=mg$)?
As you pointed out right: $W = F \Delta s$ and the energy is derived form integrating over the path. If we assume that the gravitational field remains constant (so $g$ is independent on the position of the considered object) and that an object falls down form the height $h$ we have to integrate $mg\Delta s$ from $h$ to $0$, which yields $-mgh$. If you are familiar with concept of energy conservation, this(the potential energy) is equivalent to the kinetic energy the mass wins in a free fall from height $h$, which is $E_k = \frac{1}{2}mv^2$
Sep
28
comment Does a material exist that reduces a magnetic field without being affected by the magnetic field itself?
Also, if it is a type II superconductor, there will be losses due to flux pinning
Sep
28
comment Does a material exist that reduces a magnetic field without being affected by the magnetic field itself?
The point is, however, when the superconductor enters into the magnetic field, the field lines are deviated, which will be related to work... so actually, entering the region between the two magnets will cost some energy. If the plate leaves the area after, the energy will be won back.
Sep
28
comment Does a material exist that reduces a magnetic field without being affected by the magnetic field itself?
Check out this
Sep
27
comment Acceleration/tension of object. 1 on horizontal surface one hanging
By the way, I strongly advice you to not replace the masses and accelerations by the actual values, but to keep the symbols (so do not replace $m_1$ with 9). This really helps to not confuse things, also it allows you to check whether the units are right.
Sep
27
comment Acceleration/tension of object. 1 on horizontal surface one hanging
Effectively, the net force on $m_1 = 9kg$ is given by $m_1g - T$, thus the 2nd law of Newton for $m_1$ writes: $m_1g - T = m_1a$. Now what remains to do, is to write Newton's 2nd law for the other mass $m_2 = 5kg$ to find out what is $T$
Sep
27
answered Acceleration/tension of object. 1 on horizontal surface one hanging
Sep
26
awarded  Supporter
Sep
26
revised Does a material exist that reduces a magnetic field without being affected by the magnetic field itself?
added 182 characters in body
Sep
26
answered Does a material exist that reduces a magnetic field without being affected by the magnetic field itself?
Sep
21
awarded  Teacher
Sep
21
answered Will adding cold water to a hot iron pan harm it? Why/why not?
Sep
21
awarded  Editor
Sep
21
revised Why are L4 and L5 lagrangian points stable?
added 825 characters in body
Sep
21
answered Why are L4 and L5 lagrangian points stable?