Physics Exam

5/30/2020 Take Test: Week Four Final Exam – PHS104 Introductory ...

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Take Test: Week Four Final ExamPHS104 Introductory Physics Week Four

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Take Test: Week Four Final Exam

Test Information

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Timed Test This test has a time limit of 3 hours and 30 minutes.You will be noti�ed when time expires, and you may continue or submit. Warnings appear when half the time, 5 minutes, 1 minute, and 30 seconds remain.

Multiple Attempts Not allowed. This test can only be taken once.

Force Completion This test can be saved and resumed later. The timer will continue to run if you leave the test.

This is a 20-question Quiz which will assess your knowledge on this week's Learning Resources.

Please answer each question below and click Submit when you have completed the Quiz.

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QUESTION 1

When a 80kg man stands on a pogo stick the spring is compressed 0.120m. What is the force constant of the spring?

Paragrap Arial 3 (12pt)

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QUESTION 2

a) What is the period of a 1m long pendulum? b) What is the e�ect on the period of a pendulum of doubling its length?

Paragrap Arial 3 (12pt)

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QUESTION 3

Common static electricity involves charges ranging from nanocoulombs to microcoulombs. How many electrons are needed to form a charge of 2 00 nC?

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Remaining Time: 3 hours, 20 minutes, 23 seconds. Support

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5/30/2020 Take Test: Week Four Final Exam – PHS104 Introductory ...

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needed to form a charge of -2.00 nC?

Paragrap Arial 3 (12pt)

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QUESTION 4

What is the repulsive force between two pith balls that are 8 cm apart and have equal charges of –30 nC?

Paragrap Arial 3 (12pt)

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QUESTION 5

Two points charges exert a 5.00 N force on each other. What will the force become if the distance between them is increased by a factor of three?

Paragrap Arial 3 (12pt)

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QUESTION 6

What magnitude point charge creates a 10,000 N/C electric �eld at a distance of 0.250m? How large is the �eld at 10 m?

Paragrap Arial 3 (12pt)

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QUESTION 7

What energy in joules is involved in a spark from a doorknob to your �nger if a charge of 125 nC moved through a

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Question Completion Status:

Remaining Time: 3 hours, 20 minutes, 23 seconds.

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5/30/2020 Take Test: Week Four Final Exam – PHS104 Introductory ...

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What energy in joules is involved in a spark from a doorknob to your �nger, if a charge of 125 nC moved through a potential di�erence of 5000 V?

Paragrap Arial 3 (12pt)

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QUESTION 8

What is the energy content of a 3 V calculator battery that has the ability to move 200 Cof charge over its lifetime?

Paragrap Arial 3 (12pt)

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QUESTION 9

a) What is the potential m from a proton (the average distance between the proton and electron in a hydrogen atom)? b) A high technology 0.100 F capacitor is used to store energy to operate a microelectronics device during a power failure. What energy is stored in the capacitor when 3 V is applied to it?

Paragrap Arial 3 (12pt)

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QUESTION 10

A large lightning bolt had a 20,000 A current and moved 30 C of charge. What was its duration?

Paragrap Arial 3 (12pt)

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QUESTION 11 20 points Save Answer

Question Completion Status:

Remaining Time: 3 hours, 20 minutes, 23 seconds.

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5/30/2020 Take Test: Week Four Final Exam – PHS104 Introductory ...

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QUESTION 11

Two copper wires have equal cross-sectional areas and lengths of 2 m and 0.50 m, respectively. What is the ratio of the current in the shorter wire to that in the longer one if they are connected to the same power supply?

Paragrap Arial 3 (12pt)

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QUESTION 12

What is the direction of the magnetic �eld that produces the magnetic force on a positive charge as shown in each of the three cases in the �gure below, assuming  is perpendicular to ?

Paragrap Arial 3 (12pt)

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QUESTION 13

In what substance in Table 24.1 is the speed of light  m/s?

Paragrap Arial 3 (12pt)

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QUESTION 14

What is the power in diopters of a camera lens that has a 50 mm focal length?

Paragrap Arial 3 (12pt)

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Question Completion Status:

Remaining Time: 3 hours, 20 minutes, 23 seconds.

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5/30/2020 Take Test: Week Four Final Exam – PHS104 Introductory ...

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QUESTION 15

A camera lens used for taking close-up photographs has a focal length of 22 mm. The farthest it can be placed from the �lm is 33 mm. (a) What is the closest object that can be photographed? (b) What is the magni�cation of this closest object?

Paragrap Arial 3 (12pt)

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QUESTION 16

What magni�cation will be produced by a lens of power –4 D (such as might be used to correct myopia) if an object is held 25 cm away?

Paragrap Arial 3 (12pt)

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QUESTION 17

How far from a piece of paper must you hold your father’s 2.25 D reading glasses to try to burn a hole in the paper with sunlight?

Paragrap Arial 3 (12pt)

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QUESTION 18

A converging lens with a focal length of 20 cm is used to produce an image of a screen that is 2 m from the lens. What is the object distance?

Paragrap Arial 3 (12pt)

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Question Completion Status:

Remaining Time: 3 hours, 20 minutes, 23 seconds.

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5/30/2020 Take Test: Week Four Final Exam – PHS104 Introductory ...

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QUESTION 19

What is the momentum of an electron traveling at 0.980 c?

Paragrap Arial 3 (12pt)

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QUESTION 20

Find the momentum of a helium nucleus having a mass of that is moving at 0.200 c.

Paragrap Arial 3 (12pt)

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Question Completion Status:

Remaining Time: 3 hours, 20 minutes, 23 seconds.

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