Given a circuit consisting of a DC battery of voltage 200 volts connected to a single resistor. If the electric current through
1 answer:
Given:
The battery voltage, V=200 V
The current through the resistor, I=50000 mA=50000×10⁻³ A
To find:
The resistance of the resistor.
Explanation:
From Ohm's law, the voltage across a circuit is directly proportional to the current through the circuit.
Thus the voltage across the resistor is given by,
On substituting the known values in the above equation,
Final answer:
The resistance of the resistor is 4 Ω
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Answer:
to overcome the out of friction we must increase the angle of the plane
Explanation:
To answer this exercise, let's propose the solution of the problem, write Newton's second law. We define a coordinate system where the x axis is parallel to the plane and the other axis is perpendicular to the plane.
X axis
fr - Wₓ = m a (1)
Y axis
N- = 0
N = W_{y}
let's use trigonometry to find the components of the weight
sin θ = Wₓ / W
cos θ = W_{y} / W
Wₓ = W sin θ
W_{y} = W cos θ
the friction force has the formula
fr = μ N
fr = μ Wy
fr = μ mg cos θ
from equation 1
at the point where the force equals the maximum friction force
in this case the block is still still so a = 0
F = fr
F = (μ mg) cos θ
We can see that the quantities in parentheses with constants, so as the angle increases, the applied force must be less.
This is the force that balances the friction force, any force slightly greater than F initiates the movement.
Consequently, to overcome the out of friction we must increase the angle of the plane
the correct answer is to increase the angle of the plane