Explanation

To find the stored energy, we can use the formula:

Energy (E) = 0.5 × Capacitance (C) × Voltage² (V²)

Given:

C = 20 F

V = 200 V

E = 0.5 × 20 F × (200 V)²

= 0.5 × 20 × 40,000

= 400,000 J

Explanation

Sound needs a medium (like air, water, or solids) to travel because it moves by vibrating particles.

In a vacuum, there are no particles to vibrate, so sound cannot travel and no sound can be heard.

Explanation

The vector product (cross product) of two vectors gives a vector that is perpendicular to both original vectors.

Angular momentum is a vector product of position and linear momentum vectors.

Explanation

The formula for resistance is R = V/I.

This formula is derived from Ohm's law,

which states that the electrical resistance of a circuit is the ratio between the voltage applied to the current flowing through it

Explanation

 When a sound wave moves from one medium to another, the quantity that remains the same is its frequency. 

The frequency of a sound wave is determined by the source of the sound and doesn't change when it enters a different medium.

However, the wavelength and speed of the wave can change depending on the properties of the new medium. 

Explanation

Explanation

Explanation

Explanation

Explanation