How does the image distance (di) of a convex lens compare with the image distance of a concave lens?
2 answers:
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The strength of the magnetic field is
Explanation:
When a charged particle is moving in a uniform magnetic field, the particle experiences a force perpendicular to the direction of motion. This force is given by
where
q is the charge of the particle
v is the velocity of the particle
B is the strength of the magnetic field
Since this force acts perpendicular to the direction of motion, the particle moves in a circular motion and the force acts as a centripetal force, so we can write:
where
m is the mass of the particle
r is the radius of the circular orbit
We can re-arrange the equation in order to isolate B:
In this problem, we have electrons, with
r = 0.25 m
Substituting these numbers, we find the strength of the magnetic field:
Learn more about magnetic fields:
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Answer:
per mole of pentane = 3157.53 kJ/mol
Explanation:
Given:
Mass of pentane, m = 0.468 gram
Molar mass of pentane, M = 72.15
Now, mol of pentane, n = mass/M = 0.468/72.15 = 0.00648 mol of C5H12
Now,
ΔT = 23.65 - 20.45 = 3.2°C
Heat capacity of the calorimeter, C = 2.21 kJ/°C
Specific heat capacity of the water, Cp = 4.184 J/g.°C
Now,
the heat gained = the heat lost
also,
or
and
Now,
we have,
(Here negative sign depicts the release of the heat)
per mole of pentane =-20460.8/(0.00648 ) = 3157.53 kJ/mol