1.) An RLC circuit connected in series has a resistance of 5 ohms, an inductance of 0.05 henry, a capacitor of 4 x 104 farad, and an applied alternating emf of 200cos100t volts. Find an expression for the current flowing through this circuit if the initial current and initial charge of the capacitor are both zero.

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1.) An RLC circuit connected in series has a resistance of 5 ohms, an inductance of
0.05 henry, a capacitor of 4 x 104 farad, and an applied alternating emf of
200cos100t volts. Find an expression for the current flowing through this circuit if
the initial current and initial charge of the capacitor are both zero.
d²y
2.) Using method of undetermined coefficients, solve
dx2
+ 3y = x² + cos x.
dx3 + 3x² d²y
dy
+ x
dx2
dx
d³y
3.) Solve
+ 8y = 65 cos ( log x)
using the method of
variation of parameters.
4.) Using Laplace transforms, evaluate e-tsin²3t dt.
d²y
3 + 2y = 1 -
dy
5.) Solve using Laplace transform, the differential equation
dy
= 1 at x = 0.
dx
e2x
given that y(0) = 1 and
6.) Determine the equilibrium position of a cylinder of radius 30cm, height 500cm,
and weight 2.5 x 107 dynes that
water of weight density 980 dynes per cubic centimeter.
floating with its axis vertical in a deep pool of
7.) A 32 Ib weight is attached to a spring, stretching it 8ft from its natural length. The
weight is started in motion by displacing it 1ft in the upward direction and by giving
it an initial velocity of 2ft/sec in the downward direction. Find the subsequent
motion of the weight, if the medium offers negligible resistance.
8.) A tank contains 40 liters of chemical solution prepared by dissolving 80 grams of a
soluble substance in fresh water. Fluid containing 2 grams of this substance per liter
runs in at the rate of 3liters/min and the well stirred mixture runs out at the same
rate. Find the amount of substance in the tank after 20 minutes.
9.) A body of mass 2kg is dropped from a height of 200m. Find the limiting velocity of
the body if it encounters a resistance force equal to -50v.
10.) A bar of iron, previously heated to 1300 °C, is cooled in a large bath of water
maintained at a constant temperature of 50 °C. The bar cools by 200 ° in the first
minute. How much longer will it take to cool a second 200 °?
Transcribed Image Text:1.) An RLC circuit connected in series has a resistance of 5 ohms, an inductance of 0.05 henry, a capacitor of 4 x 104 farad, and an applied alternating emf of 200cos100t volts. Find an expression for the current flowing through this circuit if the initial current and initial charge of the capacitor are both zero. d²y 2.) Using method of undetermined coefficients, solve dx2 + 3y = x² + cos x. dx3 + 3x² d²y dy + x dx2 dx d³y 3.) Solve + 8y = 65 cos ( log x) using the method of variation of parameters. 4.) Using Laplace transforms, evaluate e-tsin²3t dt. d²y 3 + 2y = 1 - dy 5.) Solve using Laplace transform, the differential equation dy = 1 at x = 0. dx e2x given that y(0) = 1 and 6.) Determine the equilibrium position of a cylinder of radius 30cm, height 500cm, and weight 2.5 x 107 dynes that water of weight density 980 dynes per cubic centimeter. floating with its axis vertical in a deep pool of 7.) A 32 Ib weight is attached to a spring, stretching it 8ft from its natural length. The weight is started in motion by displacing it 1ft in the upward direction and by giving it an initial velocity of 2ft/sec in the downward direction. Find the subsequent motion of the weight, if the medium offers negligible resistance. 8.) A tank contains 40 liters of chemical solution prepared by dissolving 80 grams of a soluble substance in fresh water. Fluid containing 2 grams of this substance per liter runs in at the rate of 3liters/min and the well stirred mixture runs out at the same rate. Find the amount of substance in the tank after 20 minutes. 9.) A body of mass 2kg is dropped from a height of 200m. Find the limiting velocity of the body if it encounters a resistance force equal to -50v. 10.) A bar of iron, previously heated to 1300 °C, is cooled in a large bath of water maintained at a constant temperature of 50 °C. The bar cools by 200 ° in the first minute. How much longer will it take to cool a second 200 °?
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