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avanturin [10]
3 years ago
14

At what temperature will silver have a resistivity that is two times the resistivity of iron at room temperature? (Assume room t

emperature is 20° C.)
Physics
1 answer:
emmasim [6.3K]3 years ago
8 0

Answer:

The temperature of silver at this given resistivity is 2971.1 ⁰C

Explanation:

The resistivity of silver is calculated as follows;

R_t = R_o[1 + \alpha(T-T_o)]\\\\

where;

Rt is the resistivity of silver at the given temperature

Ro is the resistivity of silver at room temperature

α is the temperature coefficient of resistance

To is the room temperature

T is the temperature at which the resistivity of silver will be two times the resistivity of iron at room temperature

R_t = R_o[1 + \alpha(T-T_o)]\\\\\R_t = 1.59*10^{-8}[1 + 0.0038(T-20)]

Resistivity of iron at room temperature = 9.71 x 10⁻⁸ ohm.m

When silver's resistivity becomes 2 times the resistivity of iron, we will have the following equations;

R_t,_{silver} = 2R_o,_{iron}\\\\1.59*10^{-8}[1 + 0.0038(T-20)] =(2 *9.71*10^{-8})\\\\\ \ (divide \ through \ by \ 1.59*10^{-8})\\\\1 + 0.0038(T-20) = 12.214\\\\1 + 0.0038T - 0.076 = 12.214\\\\0.0038T +0.924 = 12.214\\\\0.0038T  = 12.214 - 0.924\\\\0.0038T = 11.29\\\\T = \frac{11.29}{0.0038} \\\\T = 2971.1 \ ^0C

Therefore, the temperature of silver at this given resistivity is 2971.1 ⁰C

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jeka94

Answer:

426.84 m

Explanation:

initial velocity u = 0

time t = 3.3 s

distance travelled s = 53.4 m

acceleration due to gravity = g

s = ut + 1/2 g t²

53.4 = 0 + 1/2 g x 3.3²

g = 9.8 m /s²

For the whole length of fall

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total time = 6.6 + 3.3 = 9.9 s

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= 480.24 m

distance travelled in last 6.6 s

= 480.24 - 53.4

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6 0
3 years ago
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let's use trigonometry

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as the measured angles are small

      tan θ = sin θ / cos θ sin θ

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we substitute

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f

or λ = 700 nm

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3 years ago
A boy is exerting a force of 70 N at a 50-degree angle on a lawn mower. He is accelerating at 1.8 m/s2. Round the answers to the
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Answer:

are you in middle school

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8 0
3 years ago
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A)  f = 1.8 rev/s = 2 Hz 
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B)  not really sure..srry

C)  </span><span>T = 2 pi √ ( L / g ) </span>
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Hope this helps a little at least.. :)

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