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First Year Physics Work and Energy


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Class 9Class 10First YearSecond Year
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.

v. The kinetic energy of a body of mass 2 \mathrm{~kg} is 25 \mathrm{~J} . Its speed is(a) 5 \mathrm{~ms}^{-1} (b) 12.5 \mathrm{~ms}^{-1} (c) 25 \mathrm{~ms}^{-1} (d) 50 \mathrm{~ms}^{-1}
v. The kinetic energy of a body of mass  2 \mathrm{~kg}  is  25 \mathrm{~J} . Its speed is(a)  5 \mathrm{~ms}^{-1} (b)  12.5 \mathrm{~ms}^{-1} (c)  25 \mathrm{~ms}^{-1} (d)  50 \mathrm{~ms}^{-1}

v.Thekineticenergyofabodyofmass2 kgis25 J.Itsspeedis(a)5 ms1(b)12.5 ms1(c)25 ms1(d)50 ms1v. The kinetic energy of a body of mass 2 \mathrm{~kg} is 25 \mathrm{~J} . Its speed is(a) 5 \mathrm{~ms}^{-1} (b) 12.5 \mathrm{~ms}^{-1} (c) 25 \mathrm{~ms}^{-1} (d) 50 \mathrm{~ms}^{-1}

6.1 A man has pulled a cart through 35 \mathrm{~m} applying a force of 300 \mathrm{~N} . Find the work done by the man.(10500 J)
6.1 A man has pulled a cart through  35 \mathrm{~m}  applying a force of  300 \mathrm{~N} . Find the work done by the man.(10500 J)

6.1Amanhaspulledacartthrough35 mapplyingaforceof300 N.Findtheworkdonebytheman.(10500J)6.1 A man has pulled a cart through 35 \mathrm{~m} applying a force of 300 \mathrm{~N} . Find the work done by the man.(10500 J)

How large a force is required to accelerate an electron \left(\mathrm{m}=9.1 \times 10^{-31} \mathrm{~kg}\right) from rest to a speed of 2.0 \times 10^{7} \mathrm{~ms}^{-1} through a distance of 5.0 \mathrm{~cm} ?
How large a force is required to accelerate an electron  \left(\mathrm{m}=9.1 \times 10^{-31} \mathrm{~kg}\right)  from rest to a speed of  2.0 \times 10^{7} \mathrm{~ms}^{-1}  through a distance of  5.0 \mathrm{~cm}  ?

Howlargeaforceisrequiredtoaccelerateanelectron(m=9.1×1031 kg)fromresttoaspeedof2.0×107 ms1throughadistanceof5.0 cm?How large a force is required to accelerate an electron \left(\mathrm{m}=9.1 \times 10^{-31} \mathrm{~kg}\right) from rest to a speed of 2.0 \times 10^{7} \mathrm{~ms}^{-1} through a distance of 5.0 \mathrm{~cm} ?

6.5 Define energy give two types of mechanical energy.
 6.5 Define energy give two types of mechanical energy.

6.5Defineenergygivetwotypesofmechanicalenergy. 6.5 Define energy give two types of mechanical energy.

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?

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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