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Physics

Uniform acceleration: finding final velocity

Acceleration is the rate of change of velocity. When acceleration stays constant, final velocity is v = u + at, where u is initial velocity, a is acceleration and t is elapsed time.

Example

A cyclist starts at 2 m/s and accelerates at 3 m/s² for 4 s. Final velocity = 2 + 3 × 4 = 14 m/s. This relation assumes constant acceleration over those 4 seconds.

Check yourself: A body starts from rest and accelerates at 2 m/s² for 5 s. What is its final velocity?

Show answer and reasoning

10 m/s: v = 0 + 2 × 5. Starting from rest means u = 0.

Chemistry

The mole: counting particles

One mole contains exactly 6.02214076 × 10²³ specified entities, such as atoms or molecules. The amount of substance in moles is n = m/M, with mass m in grams and molar mass M in grams per mole.

Example

Using a molar mass of approximately 18 g/mol for water, 36 g of water contains 36/18 = 2 mol of water molecules, or approximately 1.204 × 10²⁴ molecules.

Check yourself: Using 44 g/mol for carbon dioxide, how many moles are in 22 g?

Show answer and reasoning

0.5 mol: n = 22/44. This counts CO₂ molecules, not individual atoms.

Biology

Bile: helping fat digestion

The liver produces bile, and the gallbladder stores and concentrates it. Bile salts help emulsify fats into smaller droplets, increasing the surface area available to lipase. Bile does not contain digestive enzymes.

Example

Think of a large fat droplet being dispersed into many smaller droplets. Lipase can act at more exposed surfaces. Emulsification helps digestion but does not itself break the chemical bonds in fat molecules.

Check yourself: Does bile digest fats by supplying lipase?

Show answer and reasoning

No. Bile salts emulsify fats; lipase enzymes carry out the chemical digestion.

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Study Resources

Choose a tool for understanding, recall or revision. Sign in to save your learning progress.

Read without signing in

Try a short NEET sample lesson

Understand one idea, follow an example, then check your recall.

Physics

Uniform acceleration: finding final velocity

Acceleration is the rate of change of velocity. When acceleration stays constant, final velocity is v = u + at, where u is initial velocity, a is acceleration and t is elapsed time.

Example

A cyclist starts at 2 m/s and accelerates at 3 m/s² for 4 s. Final velocity = 2 + 3 × 4 = 14 m/s. This relation assumes constant acceleration over those 4 seconds.

Check yourself: A body starts from rest and accelerates at 2 m/s² for 5 s. What is its final velocity?

Show answer and reasoning

10 m/s: v = 0 + 2 × 5. Starting from rest means u = 0.

Chemistry

The mole: counting particles

One mole contains exactly 6.02214076 × 10²³ specified entities, such as atoms or molecules. The amount of substance in moles is n = m/M, with mass m in grams and molar mass M in grams per mole.

Example

Using a molar mass of approximately 18 g/mol for water, 36 g of water contains 36/18 = 2 mol of water molecules, or approximately 1.204 × 10²⁴ molecules.

Check yourself: Using 44 g/mol for carbon dioxide, how many moles are in 22 g?

Show answer and reasoning

0.5 mol: n = 22/44. This counts CO₂ molecules, not individual atoms.

Biology