Work done by a man in carrying a suitcase weighing 10 kg on his head while walking 5 m horizontally (g=10) is MCQ with Answer and Explanation

Explanation:
Least count determines precision: two decimal places. So 2.50 cm. Extra digits indicate false precision.

Explanation:
In the SI system of prefixes, 'Peta' stands for 10^15. Other common large prefixes include Kilo (10^3), Mega (10^6), Giga (10^9), Tera (10^12), and Exa (10^18). It's crucial to memorize both positive and negative powers (like nano, pico, femto) for competitive exams.

Explanation:
Rocket propulsion: expelled gases backwards impart forward momentum to rocket. Total momentum of rocket + exhaust gases remains conserved. No external force, so momentum conservation applies. Jet engines also work on similar principle.