EASY
Lower Secondary Stage 9
IMPORTANT
Earn 100

When gases become hot, their particles move further apart. Explain why hot air balloons float. 

Important Questions on Moments, Pressure and Density

EASY
Lower Secondary Stage 9
IMPORTANT
Cambridge Lower Secondary Science Stage 9: Student's Book>Chapter 10 - Moments, Pressure and Density>End of Chapter Review>Q 14

Cranes have counterweights. Use the diagram to explain why the counterweighs must more than the load. 

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