Answer:
The volume of the lungs at 5m deep is 4L
Explanation:
Hello!
We can solve this problem considering that the air inside de lungs behave as an ideal gas, and that the temperature is the same at sea leavel and 10 m below the surface, in this case:
P1 V1 = P2 V2 -- (1)
wher P and V stands for pressure and volume, and 1 and 2 for the intial (sea level) and final (5m below) states.
We know that:
P1 = 14.7 psi
V1 = 6 L
And if the pressure exerted by the water adds 14.7 psi to atmospheric pressure so 10 m below the surface, then at 5 m below it must add 14.7/2 psi, therefore:
P2 = (14.7/2) psi + atmospheric pressure = 7.35 psi + 14.7 psi
P2 = 22.05 psi
Solving equation (1) for V2:
V2 = V1 (P1/P2) = 6 L (14.7 psi / 22.05 psi ) = 6 *(2/3) = 4 L
The volume of the lungs at 5m deep is 4L
Answer: Frequency
Explanation: Frequency is term which best describes how often a person exercises.
Back emf is 85.9 V.
<u>Explanation:</u>
Given-
Resistance, R = 3.75Ω
Current, I = 9.1 A
Supply Voltage, V = 120 V
Back emf = ?
Assumption - There is no effects of inductance.
A motor will have a back emf that opposes the supply voltage, as the motor speeds up the back emf increases and has the effect that the difference between the supply voltage and the back emf is what causes the current to flow through the armature resistance.
So if 9.1 A flows through the resistance of 3.75Ω then by Ohms law,
The voltage across the resistance would be
v = I x R
= 9.1 x 3.75
= 34.125 volts
We know,
supply voltage = back emf + voltage across the resistance
By plugging in the values,
120 V = back emf + 34.125 V
Back emf = 120 - 34.125
= 85.9 Volts
Therefore, back emf is 85.9 V.