Physics

A geostationary satellite orbits the Earth with a period equal to the Earth's rotational period, which is 24 hours. This allows the satellite to remain fixed over one point on the equator.

Since the car is moving at a constant speed and the ball is thrown straight up, the ball retains the horizontal velocity of the car and falls back into the boy's hand.

The angle of friction is the angle made between the normal reaction and the resultant reaction when a body is on the verge of sliding, and the angle of repose is the maximum angle at which a body can rest without sliding. These two angles are equal for a given surface and material.

A transformer operates on the principle of mutual induction, where a changing current in the primary coil induces a voltage in the secondary coil through a shared magnetic field.

Atomic power plants generate energy primarily through nuclear fission, where heavy atomic nuclei split into smaller nuclei, releasing a large amount of energy. Fusion is not yet used in commercial power plants, and thermal combustion is unrelated to atomic power generation.

The time period of a pendulum depends on the acceleration due to gravity. Since the Moon's gravity is weaker than Earth's, the pendulum's time period increases when taken to the Moon.

As you descend into a well, you move closer to the Earth's center, where the gravitational force slightly decreases, causing your weight to slightly decrease.

The intensity of the Earth's gravitational field is maximum at the poles because the Earth is an oblate spheroid, causing the poles to be closer to the Earth's center of mass than the equator. This results in a stronger gravitational pull at the poles compared to the equator or surface in general.

Velocity is defined as the speed of an object in a specific direction, distinguishing it from speed which is scalar and directionless. Therefore, the speed of an object in one direction is called velocity.

Heinrich Hertz was the first scientist to successfully generate and detect electromagnetic waves, proving Maxwell's theory experimentally. Thomas Edison did not work on electromagnetic waves, and the others are known for different contributions.