What type of circuit has all its resistors in the same path?
2 answers:
Answer:
A series circuit
Explanation:
Resistors can be connected in two different configurations:
- Series: all resistors are connected along the same path. In this case, the current flowing through each resistor is the same, while the potential difference across each resistor is different. The total resistance of the circuit for resistor in series is given by
- Parallel: each resistor is connected to the same batter through a different branch. In this case, the potential difference across each resistor is the same, while the current flowing through each resistor is different. The total resistance of the circuit for resistors in parallel is given by
In this problem, we have resistors all connected in the same path, so they are connected in a series configuration.
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Answer:
a) The student must run flight of stairs to lose 1.00 kg of fat 709.5 times.
b) Average power
P(w)= 1062.07 [w]
P(hp)=1.42 [hp]
c) This activity is highly unpractical, because the high amount of repetitions he has to due in order to lose, just 1 Kg of fat.
Explanation:
First, lets consider the required amount of work to move the mass of the student. (considering running stairs just as a vertical movement)
Work:
Where m is the mass of the student, g is gravity (9.8 m/s) and d is the total distance going up the stairs (0.15m *85steps= 12.75m )
Converting from Joules to Kcals:
Now lets take into account the efficiency of the human body (20%)
2.537 ---> 20%
x ---> 100%
So the student is consuming 12.685 KCals each time he runs up the stairs.
Now,
1 g --> 9 Kcals
1000 g --> 9000KCals
Burning 1 g of fat, requieres 9 KCals, 1000g burns 9000KCals. So in order to burn a 1Kg of fat:
He must run up the stairs 709.5 times, to burn 1 Kg of fat.
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For b) just converting units, taking into account the time lapse. (53103.75 is the 100% of the energy in joules, from converting 12.685Kcals to joules)
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