Explanation

Momentum is the product of an object’s mass and its velocity → Momentum = Mass × Velocity.

Momentum is given by the formula: p = mv

It is a vector quantity.

It is conserved in closed systems during collisions.

It depends on mass and speed, not on acceleration, so momentum is independent of acceleration.

Explanation

First law of motion is also called the Law of Inertia.

It states that an object will stay at rest or move with constant velocity unless an external force changes its state.

Explanation

Gravitational force is the natural force of attraction between any two masses in the universe.

This force is always attractive.

It acts along the line joining the centers of the two masses.

Explanation

A food chain always begins with producers.

It usually green plants or algae, that make their own food through photosynthesis.

Explanation

Contemporary means جدید یا نیا

Modern means جدید یا نیا

Explanation

(x - 2)(x + 3) = 0

This implies:

x - 2 = 0 or x + 3 = 0

x = 2 or x = -3

Explanation

Citric acid occurs naturally in:

• Lemons,
• Limes,
• Pineapples,
• Grapefruits,
• Berries (not blueberries),
• Tomatoes,
• Broccoli,
• Carrots,
• and some varieties of Peppers.

Explanation

Sulfuric acid (H₂SO₄) is called the "King of Chemicals" or "King of Compounds" due to its wide use in industries like fertilizers, batteries, and detergents.

It plays a key role in chemical manufacturing.

It is often used to measure a country's industrial strength.

Explanation

A device that is used to convert AC voltage into DC voltage is called A Rectifier.

Inverters and rectifiers are electronic circuits that can change the type of electric current.

a rectifier converts AC to DC.

Explanation

A convex lens has either one or both of its surfaces curving outwards, that is, wider divergence from the plan at the center.

These lenses are used to correct long-sightedness (hypermetropia).