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Class 9 Physics work And Energy


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A car mass 800 \mathrm{~kg} traveling at 54 \mathrm{kmh}^{-1} is brought to rest in 60 meters. Find the average retarding force on the car. What has happened to original kinetic energy?
A car mass  800 \mathrm{~kg}  traveling at  54 \mathrm{kmh}^{-1}  is brought to rest in 60 meters. Find the average retarding force on the car. What has happened to original kinetic energy?

Acarmass800 kgtravelingat54kmh1isbroughttorestin60meters.Findtheaverageretardingforceonthecar.Whathashappenedtooriginalkineticenergy?A car mass 800 \mathrm{~kg} traveling at 54 \mathrm{kmh}^{-1} is brought to rest in 60 meters. Find the average retarding force on the car. What has happened to original kinetic energy?

An object has 1 \mathrm{~J} of potential energy. Explain what does it mean?
An object has  1 \mathrm{~J}  of potential energy. Explain what does it mean?

Anobjecthas1 Jofpotentialenergy.Explainwhatdoesitmean?An object has 1 \mathrm{~J} of potential energy. Explain what does it mean?

When a rocket re-enters the atmosphere its nose cone becomes very hot. Where does this heat energy come from?
When a rocket re-enters the atmosphere its nose cone becomes very hot. Where does this heat energy come from?

Whenarocketreenterstheatmosphereitsnoseconebecomesveryhot.Wheredoesthisheatenergycomefrom?When a rocket re-enters the atmosphere its nose cone becomes very hot. Where does this heat energy come from?

6.6 Define K.E. and derive its relation.
6.6 Define K.E. and derive its relation.

6.6DefineK.E.andderiveitsrelation.6.6 Define K.E. and derive its relation.

6.10 An electric motor of 1 \mathrm{hp} is used to run water pump. The water pump takes 10 minutes to fill an overhead tank. The tank has a capacity of 800 litres and height of 15 \mathrm{~m} . Find the actual work done by the electric motor to fill the tank. Also find the efficiency of the system.
6.10 An electric motor of  1 \mathrm{hp}  is used to run water pump. The water pump takes 10 minutes to fill an overhead tank. The tank has a capacity of 800 litres and height of  15 \mathrm{~m} . Find the actual work done by the electric motor to fill the tank. Also find the efficiency of the system.

6.10Anelectricmotorof1hpisusedtorunwaterpump.Thewaterpumptakes10minutestofillanoverheadtank.Thetankhasacapacityof800litresandheightof15 m.Findtheactualworkdonebytheelectricmotortofillthetank.Alsofindtheefficiencyofthesystem.6.10 An electric motor of 1 \mathrm{hp} is used to run water pump. The water pump takes 10 minutes to fill an overhead tank. The tank has a capacity of 800 litres and height of 15 \mathrm{~m} . Find the actual work done by the electric motor to fill the tank. Also find the efficiency of the system.

What sort of energy is in the following:(b) Water in a high dam
What sort of energy is in the following:(b) Water in a high dam

Whatsortofenergyisinthefollowing:(b)WaterinahighdamWhat sort of energy is in the following:(b) Water in a high dam

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