A car has a mass of 550 kg. What is the weight of the car?
2 answers:
<u>Answer:</u> The weight of the car is 5390 N
Explanation:
Weight is defined as the force exerted by the body on any surface. It is also defined as the product of mass of the body multiplied by the acceleration due to gravity.
Mathematically,
where,
W = weight of the car
m = mass of the car = 550 kg
g = acceleration due to gravity on Earth =
Putting values in above equation, we get:
Hence, the weight of the car is 5390 N
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<h2>Answer:</h2>
0.5Ω
<h2>Explanation:</h2>Since different currents are passing through the resistors, then the resistors are most probably connected in parallel. This also means that the same voltage will pass across them.
Using Ohm's law, the voltage across a resistor in a circuit is given by;
V = I(R + r) -----------(i)
<em>For the 1ohm resistor, the voltage across it is given by;</em>
<em>Where;</em>
I = current passing through the 1 ohm resistor = 0.6A
R = resistance of the 1 ohm resistor = 1Ω
r = internal resistance of the cell = r
Substitute these values into equation (i) as follows;
V = 0.6(1 + r) -------------------(ii)
<em>For the 4.0ohm resistor, the voltage across it is given by;</em>
<em>Where;</em>
I = current passing through the 4.0 ohms resistor = 0.2A
R = resistance of the 4.0 ohms resistor = 4.0Ω
r = internal resistance of the cell = r
Substitute these values into equation (i) as follows;
V = 0.2(4.0 + r) -------------------(iii)
<em>Now solve equations (ii) and (iii) simultaneously;</em>
V = 0.6(1 + r)
V = 0.2(4.0 + r)
Substitute the value of V in equation (ii) into equation (iii). Therefore, we have;
0.6(1 + r) = 0.2(4.0 + r)
<em>Solve for r</em>
0.6 + 0.6r = 0.8 + 0.2r
0.6r - 0.2r = 0.8 - 0.6
0.4r = 0.2
r =
r = 0.5
Therefore, the internal resistance of the cell is 0.5Ω