Question

Differential equations:

1. Initially, a large tank with a capacity of 100 gallons contains 50 gallons of clean water. A salt solution with a concentration of 5lb / gal flows into the tank at a rate of 15 gal / min. The solution is perfectly well mixed while removing solution at a rate of 14 gal / min. Find the amount of salt the instant it fills up.

*GIVEN OPTIONS:

a) 499.9 - b) 1250.8 - c) 200.9 - d) 900.8

2. In an RL series circuit with L = 1/25 (H), E = 10V, R = 200 Ω
find the time in seconds in which the current has the value 9/200
take i (0) = 0

*GIVEN OPTIONS:

a) .82 - b) .011 - c) .00046 - d) .000091

THANKS!

Answer 1