Homework 4
1. Problem 3.14 in the textbook. First you will need to derive the equation of motion. For the dashpot force, youll need dy/dt but y is a function of x. Think about how to get dy/dt. 2. Problem 3.16 in the textbook. This problem is a combinatio
HW 4 answers P3.1 Describe the construction of capacitors. Answer Capacitors consist of two parallel thin plate conductors separated by a thin layer of insulating material. P3.3 If the voltage across a capacitor is constant, what is the value of the curre
Homework 5
1. Problem 4.1 in the textbook.
2. Problem 4.4 in the textbook. Suggestion: Find the particular and homogeneous solutions of the ordinary differential equation. 3. 4. Problem 4.5 in the textbook. Note that this is for a damped system. Problem 4
{a} The 1 cf and 2 uf in series an the left
have a cap cft1it2jitt1+21= 2.13. The 2.13
Lit in parallel with the 3 uf is (sews =
3.6666 uf. lGcing to the right sicle cf the
circuiL the 1 UT and 1 cf in parallel have an
equivalent capacitance cf 1+1 = 2 cf.
HW 6 answers
Using the parallel Z formula for two elements in parallel: 1 / ( 1/Z1 + 1/Z2) = Z1Z2/(Z1+Z2) and Z1 = jwL and Z2 = 1/jwC = j(1/wC) then:
(jwL)(j(1/wC) j wL (jwL)+j(1/wC) j(wL1/wC) (1w2LC)
(wL/wC)
for w=500 Z = j(500)(0.1)/(1 5002(0.1)(10e6) =
Homework 7
1. Problem 5.13 in the textbook.
2. Problem 5.20 in the textbook. Use as coordinates the extensions of the springs. 3. Problem 5.14 in the textbook. The linearized equations of motion from Problem 5.3 are:
4.
Problem 5.18 in the textbook.
5. Pl
HW 7 answers
A more meaningful and easier graph could have been done as a Bode plot. Consider that when the frequency is low, the inductor L impedance is small compared to the resistors. Then R1 and R2 form a voltage divider. Each are 1 ohm, so the voltag
Homework 10
1. Problem 7.6 in the textbook. The second sentence of the problem should say, Assume that mass of and undergoes small angular displacements Ignore weight in this problem. and the mass center displacement of in terms . You should get EOMs in t
Homework 3
1. Problem 3.3 in the textbook. The angle is the angle of rotation for the pendulum, and can be assumed to be small for the second part of the problem. 2. Problem 3.5 in the textbook. Make it clear what position y(t) is measured from. 3. Proble
EE331-15805 Test 4 - Preston -
Closed book
Your name:_
1. (1 point each 20 total) Write the answer to the left of each question. right _Which direction is the force on a current out of a page that is in a downward magnetic field? 0 _What is the intensity
Homework 1
1. Problem 1.2 in the textbook. Note that since the hoop is smooth, there is no friction force. The problem statement suggests summing forces in the transverse (or tangential, or circumferential) direction, because this direction is perpendicul
P 1.5 The charge on an electron is 1.6e-19 coulombs. A current of 1 ampere flows in a wire carried by electrons. How many electrons pass through a cross section of the wire each second? Hintthe definition of 1 amp of current is 1 coulomb of charge passing
Homework 2
1. 2. Problem 2.3 in the textbook. Problem 2.6 in the textbook.
3. Problem 2.11 in the textbook. You will have to do a correct dynamic analysis (including a free-body diagram) to get an equation of motion. Think about the relationship between a
HW 2
Redraw the figure as shown here: Then the 1 and 3 ohm resistors are in parallel with (3)(1)/(3+1) = 3/4 ohms and the 4 and 2 ohm resistors are in parallel with (4)(2)/(4+2) = 8/6 = 4/3 ohms. The final resistance is the sum of 3/4 + 4/3 ohms since the
HW 2
Redraw the figure as shown here: Then the 1 and 3 ohm resistors are in parallel with (3)(1)/(3+1) = 3/4 ohms and the 4 and 2 ohm resistors are in parallel with (4)(2)/(4+2) = 8/6 = 4/3 ohms. The final resistance is the sum of 3/4 + 4/3 ohms since the