An operating television set draws 0.71 ampere of current when connected to a 120-volt outlet. Calculate the time it takes the television to consume 3.0 x 10^5 joules of electronic energy. [Show all work, including an equation and substitution with units]. ** Round to the nearest whole number

3521 seconds

Explanation:

The power that the television uses is calculated multiplying the current by the voltage:

P = I * V

with I = 0.71 A and V = 120 Volts, we have:

P = 0.71 * 120 = 85.2 W

To find the time it takes to consume 3*10^5 Joules, we need to know that the total energy consumed is equal to the power times the amount of time, so:

E = P * t

with E = 300000 and P = 85.2, we have:

300000 = 85.2 * t

t = 300000/85.2 = 3521.13 seconds = 3521 seconds

answer and explanation;

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.