Entropy measures _____. a. disorder b. energy c. heat transferred d. force
2 answers:
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Complete question:
A 45-mH ideal inductor is connected in series with a 60-Ω resistor through an ideal 15-V DC power supply and an open switch. If the switch is closed at time t = 0 s, what is the current 7.0 ms later?
Answer:
The current in the circuit 7 ms later is 0.2499 A
Explanation:
Given;
Ideal inductor, L = 45-mH
Resistor, R = 60-Ω
Ideal voltage supply, V = 15-V
Initial current at t = 0 seconds:
I₀ = V/R
I₀ = 15/60 = 0.25 A
Time constant, is given as:
T = L/R
T = (45 x 10⁻³) / (60)
T = 7.5 x 10⁻⁴ s
Change in current with respect to time, is given as;
Current in the circuit after 7 ms later:
t = 7 ms = 7 x 10⁻³ s
Therefore, the current in the circuit 7 ms later is 0.2499 A
Answer:
Explanation:
I will try to use newton’s second law and its’ concept of spring. The detailed solution is shown it the documents and I also used some mathematical concept which is highlighted.
Answer:
(a) Magnitude of seat force at lowest point = 678 + 92 = 770
(b) Force exerted by the seat (highest point) = 310 N
(c) Force exerted by seat (lowest point) = 1046 N
Explanation:
At the highest point the magnitude of force by the seat = 586 N
The weight of the student = 678 N
Thus, at the highest point, the difference in this force is due to the centrifugal force acting on the boy. This can be calculated as follows:
Centrifugal Force = 678 - 586 = 92 N
(a) The magnitude of force on the student by the seat at the lowest point will have to appose both the student's weight and centrifugal force acting towards the ground. This would mean:
Magnitude of seat force at lowest point = 678 + 92 = 770 N
(b) If the wheel's speed is doubled, the centrifugal force will change accordingly. The equation of centrifugal force is given below:
We can see from this that the force is directly proportional to the square of the velocity. So if the velocity is doubled, the centrifugal force increases four times.
So at the highest point the centrifugal force will decrease the force of weight acting on the seat. The seat force would then be:
Force exerted by the seat = Weight - Centrifugal force
Force exerted by the seat = 678 - (4 * 92)
Force exerted by the seat (highest point) = 310 N
(c) The force exerted by the seat at the lowest point will be the centrifugal force plus the weight.
This is:
Force exerted by seat = Centrifugal force + Weight
Force exerted by seat = (4 * 92) + 678
Force exerted by seat (lowest point) = 1046 N