Question

[-/1 Points] DETAILS MY NOTES SERCP11 17.6.P.040. PRACTICE ANOTHER ASK YOUR TEACHER A typical cellular phone consumes an average of about 1.24 W of electrical power and operates on 3.80 V. HINT (a) What average current (in A) does the phone draw from its battery? A (b) Calculate the energy (in J) stored in a fully charged battery if the phone requires charging after 8.43 hours of use. Need Help? Read It Watch It Submit Answer 10. [-/1 Points] DETAILS MY NOTES SERCP11 17.6.P.048. ASK YOUR TEACHER PRACTICE ANOTHER An office worker uses an immersion heater to warm 497 g of water in a light, covered, insulated cup from 20°C to 100°C in 3.00 minutes. The heater is a Nichrome resistance wire connected to a 120-V power supply. Assume that the wire is at 100°C throughout the 3.00-min time interval. (a) Calculate the average power required to warm the water to 100°C in 3.00 min. (The specific heat of water is 4186 J/kg °C.) W (b) Calculate the required resistance in the heating element at 100°C. ? (c) Calculate the resistance of the heating element at 20.0°C. ? (d) Derive a relationship between the diameter of the wire, the resistivity at 20.0°C, $\rho_0$, the resistance at 20.0°C, $R_0$, and the length L. (Do not substitute numerical values; use variables only.) d = (e) If L = 3.00 m, what is the diameter of the wire? mm Need Help? Read It Submit Answer

          [-/1 Points]
DETAILS
MY NOTES
SERCP11 17.6.P.040.
PRACTICE ANOTHER
ASK YOUR TEACHER
A typical cellular phone consumes an average of about 1.24 W of electrical power and operates on 3.80 V.
HINT
(a) What average current (in A) does the phone draw from its battery?
A
(b) Calculate the energy (in J) stored in a fully charged battery if the phone requires charging after 8.43 hours of use.
Need Help? Read It
Watch It
Submit Answer
10. [-/1 Points] DETAILS
MY NOTES
SERCP11 17.6.P.048.
ASK YOUR TEACHER
PRACTICE ANOTHER
An office worker uses an immersion heater to warm 497 g of water in a light, covered, insulated cup from 20°C to 100°C in
3.00 minutes. The heater is a Nichrome resistance wire connected to a 120-V power supply. Assume that the wire is at
100°C throughout the 3.00-min time interval.
(a) Calculate the average power required to warm the water to 100°C in 3.00 min. (The specific heat of water is
4186 J/kg °C.)
W
(b) Calculate the required resistance in the heating element at 100°C.
?
(c) Calculate the resistance of the heating element at 20.0°C.
?
(d) Derive a relationship between the diameter of the wire, the resistivity at 20.0°C, $\rho_0$, the resistance at 20.0°C,
$R_0$, and the length L. (Do not substitute numerical values; use variables only.)
d =
(e) If L = 3.00 m, what is the diameter of the wire?
mm
Need Help? Read It
Submit Answer

[-/1 Points]
DETAILS
MY NOTES
SERCP11 17.6.P.040.
PRACTICE ANOTHER
ASK YOUR TEACHER
A typical cellular phone consumes an average of about 1.24 W of electrical power and operates on 3.80 V.
HINT
(a) What average current (in A) does the phone draw from its battery?
A
(b) Calculate the energy (in J) stored in a fully charged battery if the phone requires charging after 8.43 hours of use.
Need Help? Read It
Watch It
Submit Answer
10. [-/1 Points] DETAILS
MY NOTES
SERCP11 17.6.P.048.
ASK YOUR TEACHER
PRACTICE ANOTHER
An office worker uses an immersion heater to warm 497 g of water in a light, covered, insulated cup from 20°C to 100°C in
3.00 minutes. The heater is a Nichrome resistance wire connected to a 120-V power supply. Assume that the wire is at
100°C throughout the 3.00-min time interval.
(a) Calculate the average power required to warm the water to 100°C in 3.00 min. (The specific heat of water is
4186 J/kg °C.)
W
(b) Calculate the required resistance in the heating element at 100°C.
?
(c) Calculate the resistance of the heating element at 20.0°C.
?
(d) Derive a relationship between the diameter of the wire, the resistivity at 20.0°C, ρ0, the resistance at 20.0°C,
R0, and the length L. (Do not substitute numerical values; use variables only.)
d =
(e) If L = 3.00 m, what is the diameter of the wire?
mm
Need Help? Read It
Submit Answer

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