Let I be the purchase value of an equipment and V(t) be the value afte...
Scrap Value of Equipment
Differential Equation: dv(t)/dt = -k(T-t)
Explanation:
To find the scrap value of the equipment, we need to determine the value V(T) at the end of its total life T years.
Step 1: Solving the Differential Equation:
The given differential equation dv(t)/dt = -k(T-t) represents the rate at which the value of the equipment depreciates over time. To solve this equation, we can separate the variables and integrate both sides.
∫(1/V) dV = ∫-k(T-t) dt
Applying the integration, we get:
ln|V| = -k(Tt - (t^2)/2) + C
Where C is the constant of integration.
Step 2: Applying Initial Condition:
To determine the value of C, we can apply the initial condition. Initially, when t = 0, the value of the equipment is the purchase value I. Thus, we have:
ln|I| = -k(0 - (0^2)/2) + C
ln|I| = C
Therefore, the equation becomes:
ln|V| = -k(Tt - (t^2)/2) + ln|I|
Step 3: Finding the Value at the End of Total Life:
To find the value V(T) at the end of the total life T years, we substitute t = T into the equation:
ln|V(T)| = -k(TT - (T^2)/2) + ln|I|
ln|V(T)| = -k(T^2)/2 + ln|I|
Exponentiating both sides of the equation:
|V(T)| = e^(-k(T^2)/2) * |I|
Step 4: Determining the Scrap Value:
The scrap value of the equipment is the value at the end of its total life, which is V(T). Therefore, the scrap value V(T) can be expressed as:
Scrap Value (V(T)) = e^(-k(T^2)/2) * Purchase Value (I)
Conclusion:
The scrap value of the equipment, V(T), can be calculated using the equation V(T) = e^(-k(T^2)/2) * I, where I is the purchase value of the equipment, k is a positive constant representing the depreciation rate, and T is the total life of the equipment in years.