Explanation

Original salary = Rs. 50,000

Increase = 20% of 50,000

20/100​×50,000=10,000

New salary:

$$50,000+10,000=60,000$$

Explanation

Original price = Rs. 2,000

Increase = 15% of 2,000

15/100​×2000=300

New price:

$$=2000+300$$

$$=2300$$

Explanation

Formula:

M = 1 + D/f

D = 25 cm

f = 5 cm

M = 1 + 25/5

= 1 + 5

= 6

Explanation

Explanation

• Weight is a vector quantity
• Because it is a force defined as the product of mass and the acceleration due to gravity (W = mg).
• It has both magnitude (amount of force) and direction (downward, towards the center of the Earth)

Additional information 

Mass,  Time, and temperature are scalar quantities

Last updated on 09-03-2026

Explanation

144÷12=12

12×3=36

So,

144÷12×3=36

Explanation

Thus, the First law of thermodynamics furnishes the relationship between:

• heat
• work
• the internal energy of the system

Explanation

• The SI unit of power is the watt (W). 
• A watt is equal to one joule of work done per second. 
• Symbol: W
• Definition: 1 watt = 1 joule per second
• Named after: James Watt 

Explanation

• Au comes from the Latin word aurum, meaning "gold" (from "glowing dawn")
• Atomic number: 79
• Belongs to group 11 
• Category: transition metal

Additional information:

• Atomic mass: 196.97 u
• Melting point: 1,064°C
• Boiling point: 2,856°C
• Density: 19.3 g/cm³ (very heavy)

Explanation

The SI unit of momentum is kg·m/s (or N·s). In brief:

• Definition: Momentum is the product of mass and velocity (p = mv).
• Formula: p = mv
• Vector: has magnitude and direction
• Conservation: constant in closed systems
• No named unit
• Measured in kilograms (kg) and velocity in meters per second (m/s). 
• The dimensional formula of momentum is:[M L T⁻¹]
• Momentum is the product of an object’s mass and its velocity → Momentum = Mass × Velocity.
• It is a vector quantity.