The correct answer is:
<span>Point charges must be in a vacuum.
In fact, the usual form for of the Coulomb's law is:
</span>
<span>where
</span>
is the permittivity of free space
<span>q1 and q2 are the two charges
q is the separation between the two charges
However, this formula is valid only if the charges are in vacuum. If they are in a material medium, the law is modified as follows:
</span>
where
is the relative permittivity, which takes into account the dielectric effects of the material.
Answer:
The value is 
Explanation:
From the question we are told that
The wavelength of each source is 
The distance from the pinhole 
The diameter is 
Generally from Rayleigh's criterion we have that the distance between the sources of light for their diffraction patterns is mathematically represented as '
=> 
=>
Answer:
F = 8.25 10⁴ N
Explanation:
The definition of pressure is
P = F / A
F = P A
Let's use Newton's second law in the window
F = F₁- F₂
F = P₁ A - P₂ A
F = (P₁ -P₂) A
The area of a square window is
A = L²
F = (P₁ -P₂) L²
Let's reduce the magnitudes to the SI system
P₁ = 1.2 atm (1.01 10⁵ Pa / 1 atm) = 1.212 10⁵ Pa
P₂ = 0.910 10⁵ atm = 0.9191 10⁵ Pa
Let's calculate
F = (1.1212 - 0.9191) 10⁵ 2.02²
F = 0.8246 10⁵ N
F = 8.25 10⁴ N
<span><span>23892</span>U→<span>l<span>23490</span></span>Th<span>+<span>42</span></span>He</span>
Explanation:
Uranium-238 produces thorium-234 by alpha decay.
An α-particle is a helium nucleus. It contains 2 protons and 2 neutrons, for a mass number of 4.
During α-decay, an atomic nucleus emits an alpha particle. It transforms (or decays) into an atom with an atomic number 2 less and a mass number 4 less.
Thus, uranium-238 decays through α-particle emission to form thorium-234 according to the equation:
<span><span>23892</span>U→<span>l<span>23490</span></span>Th<span>+<span>42</span></span>He</span>
Note that the sum of the subscripts (atomic numbers or charges) is the same on each side of the equation.
Also, the sum of the superscripts (masses) is the same on each side of the equation.
The potential energy at 2.00 m above the ground is 1.53 J
Explanation:
The gravitational potential energy of an object is given by
where
m is the mass of the object
g is the acceleration of gravity
h is the height of the object above the ground
In the problem, we have:
m = 0.0780 kg is the mass of the lemming
is the acceleration of gravity
h = 2.00 m is the height
Substituting, we find its potential energy at 2.00 m above the ground:
Learn more about potential energy here:
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