Acapacitor is being charged from a battery and through a resistor of 10 kω. it is observed that the voltage on the capacitor rises to 80% of its maximal value in 4 seconds. calculate the capacitor's capacitance.

Explanation:

As per the equation of voltage on capacitor we know that

now we know that voltage reached to its 80% of maximum value in 4 second time

so we will have

as we know that

answer: the exterior temperature of commercial jet planes as they leave the stratosphere and return to the ground increases steadily.

explanation:

the lower most layer of atmosphere is troposphere which extends from 0 to 12 km above the surface of the earth. the temperature initially decreases as distance is increased from the earth's surface. commercial jets fly in lower part of the stratosphere. the stratosphere extends upto 50 km. the temperature in stratosphere starts rising again due to presence of ozone which traps the uv rays.

thus, when the planes leave the stratosphere and return to the ground, the exterior temperature increases steadily.