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  • A block of mass 100 g slides down on a rough horizontal surface . If the speed of the block decreases from 10m/s to 5m/s , then the thermal energy (in Joule) developed in the process is <d

A block of mass 100 g slides down on a rough horizontal surface . If the speed of the block decreases from 10m/s to 5m/s , then the thermal energy (in Joule) developed in the process is 

Option: 1 2.23

Option: 2 2.75

Option: 3 3.25

Option: 4 3.75

Answers (1)

best_answer

As we have learned

Joule's Law -

W=JQ=mgh

mgh=J(mc.\Delta \theta)

- wherein

m = Mass of water 

c = Specific heat of water

\Delta \theta=Temperature

 

 Thermal energy produced 

= change in kinetic energy 

= 1/2 m (v_{2}^2{}- v_{1}^{2})\\\\

 1/2 \times 0.1 \times (100-25) = 3.75 J

 

Posted by

shivangi.shekhar

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