Question: a brick weighing 4kg is dropped into 1m deep river from a height of 2m.assuming that 80% of the gravitational P.E is finally converted into thermal energy ,find this thermal energy

Q

a brick weighing 4kg is dropped into 1m deep river from a height of 2m.assuming that 80% of the gravitational P.E is finally converted into thermal energy ,find this thermal energy
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, under Thermal Properties Of Matter by SHANTANU MISHRA , added 1 year, 12 months ago comment

1 year, 12 months ago SHANTANU MISHRA

answer in calorie is 23

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A

using the approx formula for PE i.e. PE = mxgxh [HTML_REMOVED] PE = 4x2x10 (considering g=10 m/s^2)[HTML_REMOVED] PE = 80 Joules [HTML_REMOVED]now thermal energy = 80 % of PE [HTML_REMOVED]=(80x80)/100 =64 joules -> answer 4 Like

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for Q. a brick weighing 4kg is dropped into 1m deep... answer added by Ratan Verma 1 year, 12 months ago comment

1 year, 12 months ago Prashanth Ellina

Ratan, I noticed that you tried to add some HTML to make the answer look good. You can use the toolbar buttons above the answer text books to do text formatting. If you need line breaks, then leave a blank line in between. HTH.

1 year, 12 months ago Ratan Verma

Thanks Prashanth for telling me this as i was really wondering on how to format the answer properly. Thanks

1 year, 12 months ago Prashanth Ellina

Ratan, the text editing box seems to be confusing most users. Just wanted to let you know that we are working on replacing it a better one.

A

using the approx formula for PE i.e. PE = mxgxh PE = 4x2x10 (considering g=10 m/s^2) PE = 80 Joules thermal energy = 80 % of PE =(80x80)/100 =64 joules -> answer 2 Like

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for Q. a brick weighing 4kg is dropped into 1m deep... answer added by Ratan Verma 1 year, 12 months ago comment