PHI 1101 Lecture 2: Practice Questions-Unit 1-Part 1

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lilachornet313

1 Mar 2016

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Model answer (for tests and the examination: this is a statement because it is a sentence used to make a claim and is capable of being either true or false. This is a statement because it is a sentence used to make a claim and is capable of being either true or false. Step one: state your answer: this is a statement. Step two: explain your answer by defining the concept and applying it: because it is a sentence used to make a claim and is capable of being either true or false. Grading: this is a statement (1 mark) because it is a sentence used to make a claim and is capable of being either true or false. (1 mark) Model answer (for tests and the examination: this is not a statement. A statement is a sentence used to make a claim and is capable of being either true or false.

Related Questions

1. You are running a recreational running event for your town. Youdecide to hold the event at a local park. There is a paved patharound the park, which happens to be perfectly square. The totaldistance around one lap of the track is 400 m (remember each sideis the same length). Please answer the following for the raceevent:
a. One runner completes 10 laps of the race. What is thetotal
distance the runner covered?

b. What is the total displacement for the runner?

c. Explain the answers for a and b using the concepts ofdistance
and displacement.

2. Explain why the difference between distance and displacement isof little concern in practical applications where velocity iscalculated.

3. Is it possible for acceleration to be negative? Explain.

I have written my answers in for the one i may of understood!Any help would be great even explanation on how to dothe parts....PLEASE HELP THANK YOU!!!!!!!!!

B. One can purchase so-called Ceramic speakers which haveavibrating ceramic instead

of a coil-driven cone to produce sound waves. These arecapableof producing

frequencies well above the range of human hearing and, infactare used for sonar and

ultrasound applications. The disks used have aconductivecoating applied to either side

of the disk and the ceramic material reacts to anappliedvoltage by contracting or

expanding by an amount proportional to the voltage.Thesedevices are capacitive rather

than inductive.

1. Write the expression for the impedance of such a speakerinterms of the resistance

and capacitance.

2. Find an expression for the frequency Ï at whichtheresistance equals the reactance of

the ceramic speaker, in terms of R and C.

3. With R = 8Î© and C = .25Î¼F, calculate thefrequency Ï, withunits, that will give R =

XC .

4. Using Ïo for the frequency you calculated in 3,calculatethe total impedance, Z, for

the following frequencies and plot the results on the logplotprovided.

Table

Ï/ Ïo 10-4 10-3 10-2 10-1 1 10 102 103 104

6. Locate your answer for part (2) on the plot. What featureofthe plot corresponds to

that answer? [4 points]

7. Describe how to quickly sketch this log-log plot for anRCcircuit with only one

calculation, based on your answer to (6). [5 points]

9. Using Ïo for the frequency you calculated in 3,calculatethe total impedance, Z, of the

LR circuit for the following frequencies and plot theresultson the log plot provided.

Table

Ï/ Ïo 10-4 10-3 10-2 10-1 1 10 102 103 104

1. Is there any difference between the static charges generated by rubbing rods with fur or silk and the charges that flow (from a battery) through wires in an electric circuit? Give evidence for your answer.

2. For the circuit on the right, indicate whether the statements below are TRUE or FALSE. If a statement is TRUE, briefly describe the evidence from this lab that supports this statement. If a statement is FALSE, give a correct statement, and briefly describe the evidence from this lab that supports this new statement.

a. The current flows from the battery, through wire A, through the bulb, and then back to the battery through wire B

b. Since the current is used up by the bulb, the current in wire B is smaller than the current in wire A

c. The current flows toward the bulb in both wires A and B

d. If wire B is disconnected, but wire A is left connected, the bulb will still light, but if wire A is disconnected and wire B is left connected, the bulb will not light.

e. A current sensor will read the same magnitude if connected to measure the current in wire A, and then connected to measure the current in wire B.

3. Name the circuit element represented by each of the following symbols: