An RL circuit has an emf of 5 V, a resistance of 50 Q, an inductance of 1 H, and no initial current. Find the current in the circuit at any time t. Distinguish between the transient and steady-state current.
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- A mass of 1 kgkg is attached to the end of a spring whose restoring force is 180 NmNm. The mass is in a medium that exerts a viscous resistance of 156 NN when the mass has a velocity of 6 msms. The viscous resistance is proportional to the speed of the object. Suppose the spring is stretched 0.07 mm beyond the its natural position and released. Let positive displacements indicate a stretched spring, and suppose that external vibrations act on the mass with a force of 7sin(3t)7sin(3t) NN at time tt seconds. Find an function to express the steady-state component of the object's displacement from the spring's natural position, in mm after tt seconds. (Note: This spring-mass system is not "hanging", so there is no gravitational force included in the model.)A cylindrical tank 24 inches in radius and 2 meters tall initially contains 100 gal of cane juice. A level sensor is installed in the tank which signals an alarm once 70% of the total volume of the tank has been reached. At t=0, cane juice containing 40% sugar is poured into the tank at the rate of 15gpm, while the stirred mixture leaves at a rate of 5 gpm. assuming that due to operator negligence, this process continued at constant rates, after how many minutes will the alarm sound. Use 1 gal = 3.785 Li.The inter-arrival time X between faults in a network is exponential with parameter λ = 5.Hence, X has the pdf
- Suppose a water tank is being pumped out at 3 L/min. The water tank starts at 10 L of clean water. Water with toxic substance is flowing into the tank at 2 L/min, with concentration 20t g/L at time t. When the tank is half empty, how many grams of toxic substance are in the tank (assuming perfect mixing)?A ball is thrown vertically upward from the top of the Leaning Tower of Pisa190 feet high with an initial velocity of 96 feet per second. During which time period will the ball’s height exceed that of the tower?For example, consider a tree with a trunk radius of 10.5 cm; imagine that the plant produced a layer of wood 0.5 cm thick in the previous year. As a consequence, the tree has 32.2 cm2 of new wood that conducts water from roots to leaves. Assume that each leaf loses water at a rate equal to the conducting capacity of 0.1 cm2 of wood; this plant can conduct enough water through its trunk to support 322 leaves. If the tree produces another 0.5 cm of wood this year, the new ring of wood will have a cross-sectional area of 33.8 cm2 . It is larger than the previous ring of wood and can support conduction to a greater number of leaves—338. Question: Imagine a tree that has a radius of 20 cm and that produces a new layer of wood 0.5 cm thick (the outer radius of the new wood is 20.5 cm and the inner radius is 20 cm). What is the cross-sectional area of the new layer of wood (CSA = pr2)? If each leaf needs 0.1 cm2 of wood to supply it with water, how many leaves can the tree have? If the…
- Suppose that a large mixing tank initially holds 300 gallons of water in which 50 pounds of salt have been dissolved. Pure water is pumped into the tank at a rate of 3 gal/min, and when the solution is well-stirred, it is then pumped out at the same rate. Determine the amount of salt in the tank after 1 hour.A young person opens an investment plan in which intrest is compounded continously and additions to the account and deposited continously at age 27 with an inital deposit of $2000 and make deposits in a conintous manner of $1500 per year thereafter. Assuming a constant intrest rate of 7% what will be the balancw when he reaches 65. Use modelling of first order diffrentiavesDefine Testing for cointegration when θ is unknown ?