Answer:
(a) The terminal voltage of the cell is <u>1.9 V.</u>
(b) The terminal voltage of the cell is <u>1.0 V.</u>
Explanation:
Given:
(a)
E.M.F of the cell (E) = 2.0 V
Internal resistance of the cell (r) = 0.02 ohms
Current passing through the cell (I) = 5 A
Now, the potential difference across the terminals of the cell is given as:
Plug in the given values and solve for 'V'. This gives,
Therefore, the terminal voltage of the cell is 1.9 V.
(b)
E.M.F of the cell (E) = 2.0 V
Internal resistance of the cell (r) = 0.02 ohms
Current passing through the cell (I) = 50 A
Now, the potential difference across the terminals of the cell is given as:
Plug in the given values and solve for 'V'. This gives,
Therefore, the terminal voltage of the cell is 1.0 V.
Answer:
150.8 J
Explanation:
The heat released by the copper wire is given by:
where:
m = 10.0 g is the mass of the wire
Cs = 0.377 j/(g.C) is the specific heat capacity of copper
is the change in temperature of the wire
Substituting into the equation, we find
And the sign is negative because the heat is released by the wire.
Answer:
58.27 N
Explanation:
the data we have is:
mass:
coefficient of friction:
and we also know the acceleration of gravity is
We need to do an analysis of horizontal and vertical forces acting on the object:
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Vertically the forces acting on the object:
so the sum of forces in the vertical axis "y" are:
from Newton's second Law we know that , so:
and since the object is not accelerating in the vertical direction (the movement is only horizontal) , and:
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now let's analyze the horizontal forces
and the two forces just mentioned must be opposite, thus the sum of forces in the "x" axis is:
and we are told that the crate moves at a steady speed, thus there is no acceleration:
and we get:
substituting known values: