Explanation

A cyclone refers to a large system of winds rotating around a low-pressure center, covering several kilometers.

A twister (or tornado) is much smaller in scale.

Explanation

To find the pressure, we use the formula:

P = F / A

Where:

- P is the pressure

- F is the force (weight) = 392 N

- A is the area = 0.0001 m²

P = 392 N / 0.0001 m² = 3,920,000 Pa

To convert Pascals (Pa) to Megapascals (MPa):

3,920,000 Pa = 3.92 MPa

Explanation

Orbital electrons have specific, quantized energy levels depending on their orbit.

They cannot have arbitrary energy values — only fixed amounts allowed by quantum rules.

Explanation

Given the conditions:

1. √x requires x ≥ 1 (from x - 1 ≥ 0)

2. Denominator x² - 2x ≠ 0 implies x ≠ 0 and x ≠ 2

The domain is indeed x ≥ 1, excluding x = 2.

So, the domain is (1, 2) ∪ (2, ∞).

Explanation

"According to" is a prepositional phrase that shows the relationship between the students' actions and the teacher's instructions.

It functions to modify the verb "act" by explaining how the students act.

Explanation

"Will have finished" is future perfect tense.

It used for an action that will be completed before a specific time in the future.

The phrase "By the time I go to bed tonight" clearly indicates a future time limit, making this tense appropriate.

Explanation

"The" is used before a specific noun that is known to the listener/reader — here, it's the specific teacher who taught us Science.

It implies there is only one particular teacher being referred to, making the definite article "the" appropriate.

Explanation

"Whom we met on holiday" cannot stand alone as a complete sentence; it depends on the main clause ("Have you seen those people"), so it's a dependent clause.

It provides extra information about "those people" and begins with the relative pronoun "whom".

Explanation

Tertiary consumers are at the top of the food chain and feed on secondary consumers.

Lion, tiger, and hawk are carnivores that eat other carnivores or herbivores.

Explanation

70% of glass is made from sand (silica, SiO₂), the primary component.

The remaining 30% includes soda ash (Na₂CO₃) and lime (CaO) to lower melting points and stabilize the glass.