On hot sunny days or days with thin clouds, the temperature over the land is warmer than the temperature over the water. The war
1 answer:
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1) Let's start by calculating the equivalent resistance of the three resistors in parallel, 
:
From which we find
Now all the resistors are in series, so the equivalent resistance of the circuit is the sum of all the resistances:
So, the correct answer is D)
2) Let's start by calculating the equivalent resistance of the two resistors in parallel:
From which we find
And these are connected in series with a resistor of
, so the equivalent resistance of the circuit is
And by using Ohm's law we find the current in the circuit:
So, the correct answer is C).
3) Let' start by calculating the equivalent resistance of the two resistors in parallel:
From which we find
Then these are in series with all the other resistors, so the equivalent resistance of the circuit is
And by using Ohm's law we find the current flowing in the circuit:
And so the voltage read by the voltmeter V1 is the voltage drop across the resistor 2-3:
So, the correct answer is D).
4) Again, let's start by calculating the equivalent resistance of the two resistors in parallel:
From which we find
Now all the resistors are in series, so the equivalent resistance of the circuit is:
The current in the circuit is given by Ohm's law
Now we can compare the voltage drops across the resistors. Resistor 1:
Resistor 2 and resistor 3 are in parallel, so they have the same voltage drop:
Resistor 4:
So, the greatest voltage drop is on resistor 1, so the correct answer is D).
5) the figure shows a circuit with a resistor R and a capacitor C, so it is an example of RC circuit. Therefore, the correct answer is D).
6) The circuit is the same as part 4), so the calculations are exactly the same. Therefore, the power dissipated on resistor 3 is
So, correct answer is B).
7) The circuit is the same as part 4), so we can use exactly the same calculation, and we immediately see that the resistor with lowest voltage drop was R4 (2.50 V), so the correct answer is B) R4.
From which we find
Now all the resistors are in series, so the equivalent resistance of the circuit is the sum of all the resistances:
So, the correct answer is D)
2) Let's start by calculating the equivalent resistance of the two resistors in parallel:
From which we find
And these are connected in series with a resistor of
And by using Ohm's law we find the current in the circuit:
So, the correct answer is C).
3) Let' start by calculating the equivalent resistance of the two resistors in parallel:
From which we find
Then these are in series with all the other resistors, so the equivalent resistance of the circuit is
And by using Ohm's law we find the current flowing in the circuit:
And so the voltage read by the voltmeter V1 is the voltage drop across the resistor 2-3:
So, the correct answer is D).
4) Again, let's start by calculating the equivalent resistance of the two resistors in parallel:
From which we find
Now all the resistors are in series, so the equivalent resistance of the circuit is:
The current in the circuit is given by Ohm's law
Now we can compare the voltage drops across the resistors. Resistor 1:
Resistor 2 and resistor 3 are in parallel, so they have the same voltage drop:
Resistor 4:
So, the greatest voltage drop is on resistor 1, so the correct answer is D).
5) the figure shows a circuit with a resistor R and a capacitor C, so it is an example of RC circuit. Therefore, the correct answer is D).
6) The circuit is the same as part 4), so the calculations are exactly the same. Therefore, the power dissipated on resistor 3 is
So, correct answer is B).
7) The circuit is the same as part 4), so we can use exactly the same calculation, and we immediately see that the resistor with lowest voltage drop was R4 (2.50 V), so the correct answer is B) R4.
Answer:
a. the ratio of the speed of light in a vacuum to the speed of light in the material it is passing though
Explanation:
When a light ray enters from one medium to another, it bends. This is because the speed of light decreases as it enters a medium having more optical density. The speed of light is maximum in vacuum.
The refractive index determines the optical density of a medium. It is the ratio of the speed of light in the vacuum (c) to the speed of light in the material it is passing through (v).