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Hawkes - Physics for Scientists and Engineers (Homework)

James Finch

Physics - College, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 4 / 20

Due : Monday, January 28, 2030 00:00 EST

Last Saved : n/a Saving...  ()

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1. –/1 points HawkPSE1 22.P.006. My Notes
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How much energy is consumed by a 77 W bulb if you leave it on for 24 h?
    

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2. –/1 points HawkPSE1 22.P.014. My Notes
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1
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–/1
 
The figure below shows an electric circuit consisting of six identical light bulbs, each with an operating resistance of 15.0 Ω, connected to a 26.0 V battery. What is the electric current flowing through the battery?
    

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3. –/1 points HawkPSE1 22.P.026. My Notes
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1
–/1
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–/1
 
The resistance of the tungsten filament in a common size of incandescent light bulb is 19 Ω. The diameter of the filament is 0.103 mm. What is the length of the filament wire?
m

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4. –/10 points HawkPSE1 22.P.044. My Notes
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1 2 3 4 5 6 7 8 9 10
–/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1 –/1
0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50 0/50
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–/10
 
The figure below shows a multiloop electric circuit. The components have the following values.
ε1 = 17 V;   ε2 = 34 V (ideal batteries)
R1 = 13 Ω;   R2 = 16 Ω;   R3 = 16 Ω;   R4 = 26 Ω
(a) Find the currents through all the branches of the circuit.
I1 =  A
I2 =  A
I3 =  A
I4 =  A
I5 =  A


(b) Find the potential differences across each circuit element.
VR1 =  V
VR2 =  V
VR3 =  V
VR4 =  V


(c) How will your answers to parts (a) and (b) differ if the batteries are real batteries?
    

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5. –/3 points HawkPSE1 22.P.046. My Notes
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1 2 3
–/1 –/1 –/1
0/50 0/50 0/50
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–/3
 
An initially uncharged 800 μF capacitor is being connected in series to a 2800 V emf source with a 80 kΩ resistor.
(a) How long will it take for the voltage across this capacitor to reach 95% of its maximum value?
s

What is its maximum value?
V

(b) When the capacitor reaches 95% of its maximum voltage, the charging circuit is removed and the capacitor is left charged but can slowly discharge through the moist air with a resistance of 1000 MΩ. How long will it take to discharge the capacitor to 30 V?
h

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6. –/3 points HawkPSE1 22.P.048. My Notes
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–/3
 
When operating, the resistance of the filament of a 60 W incandescent light bulb is 240 Ω. However, if you were to measure the resistance of the filament using a regular ohmmeter, you would find it to be about 12 times smaller (20 Ω).
(a) How can you explain this phenomenon? (Hint: Think what happens to the light bulb when it is plugged in.)
    

(b) Do appropriate calculations to show that when operating, the tungsten filament does have the appropriate resistance (240 Ω). (Use the following as necessary: V, P.)
R =


(c) Based on your calculations, find the temperature of the incandescent light bulb when operating. (The temperature coefficient of resistivity of tungsten is α = 4.5 10-3 K−1. Ignore thermal expansion. Assume the initial temperature is 20°C. )
K

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7. –/1 points HawkPSE1 22.P.054. My Notes
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1
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–/1
 
Twelve identical 5.7 Ω resistors are connected to form a cube as shown in the figure below. What is the equivalent resistance between points A and B?
Ω

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