MasteringPhysics Assignment Print View

# MasteringPhysics Assignment Print View - HW 04 Due: 11:00pm...

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HW 04 Due: 11:00pm on Friday, February 25, 2011 Note: To understand how points are awarded, read your instructor's Grading Policy . [Switch to Standard Assignment View ] Comparing brightness of light bulbs Consider five identical light bulbs (A - E) connected to a battery as shown in the circuit below. Part A Rank the brightness of all five bulbs from brightess to dimmest. Hint A.1 Brightness Hint not displayed Hint A.2 Compare the brightness of bulbs A and B Hint not displayed Hint A.3 Compare the brightness of bulbs D and E Hint not displayed Hint A.4 Compare the brightness of bulbs C and D Hint not displayed Hint A.5 Compare the brightness of bulbs C and A Hint not displayed Hint A.6 Compare the brightness of bulbs D and A Hint not displayed Rank the bulbs from brightest to dimmest. To rank items as equivalent, overlap them. ANSWER: View Correct

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How does this change effect the circuit? Suppose bulb E is unscrewed and removed from its socket. (The empty socket remains in the circuit.) Part B Does bulb A get brighter, dimmer, or stay the same brightness? Hint B.1 How to approach the problem Hint not displayed Hint B.2 Determine how the current changes Hint not displayed ANSWER: Light bulb A gets brighter. Light bulb A gets dimmer. Light bulb A stays the same brightness. Correct Brightness of Light Bulbs Ranking Task Part A Consider a circuit containing five identical light bulbs and an ideal battery. Assume that the resistance of each light bulb remains constant. Rank the bulbs (A through E) based on their brightness. Hint A.1 How to approach the problem Hint not displayed Hint A.2 Comparing bulb A to bulb B Hint not displayed Hint A.3 Comparing bulb D to bulb E Hint not displayed Hint A.4 Comparing bulb C to bulb D or E
Hint not displayed Hint A.5 Comparing bulb C to bulb A or B Hint not displayed Rank from brightest to dimmest. To rank items as equivalent, overlap them. ANSWER: View Correct Now consider what happens when a switch in the circuit is opened. Part B What happens to the brightness of bulb A? Hint B.1 How to approach this part Hint not displayed Hint B.2 Consider changes in resistance Hint not displayed ANSWER: It gets dimmer.

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It gets brighter. There is no change.
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## MasteringPhysics Assignment Print View - HW 04 Due: 11:00pm...

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