Which of the following statements is not true about electric current in a metal wire?.

SAT

1 answer:

Vesna [10]3 years ago

5 0

Answer: If the options were these :

A)The average current is directly proportional to several factors including the number of mobile electrons per unit volume in the wire

B)The average current is directly proportional to several factors including the average acceleration of the electrons

C)Electrons are slowed due to collisions with metal atoms

D)Choose this answer if all of the statements are true

E)To have a current there must be an electric field inside the conductor

Explanation: The correct answer is B

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The cooling rate of the substance is approximately 0.0732.

According to the statement, the Newton's law of cooling is defined by the following formula:

$T(t) = T_{s} + (T_{o}-T_{s})\cdot e^{-k\cdot t}$ (1)

Where:

$T_{s}$ - Final temperature, in degrees Celsius.
$T_{o}$ - Initial temperature, in degrees Celsius.
$t$ - Time, in minutes.
$k$ - Cooling rate, in $\frac{1}{min}$ .
$T(t)$ - Current temperature, in degrees Celsius.

Please notice that substance reaches thermal equilibrium when $T(t) = T_{s}$ , that is when temperature of the substance is equal to the temperature of surrounding air.

If we know that $T_{o} = 80\,^{\circ}C$ , $t = 15\,min$ , $T_{s} = 50\,^{\circ}C$ and $T(15) = 60\,^{\circ}C$ , then the cooling rate of the substance is: