guys.. i no the way im supposed 2 solve these bt having trouble getting answer...so plz. solve nd tell mah..these r frm hcv. vol2..caloremetry

 

6] a cube of iron [density 8000kg per m3  specific heat capacity 470j/kg/k ] is heated 2 a high temp  nd is placed on a large ice block of ice at  273k .. the cube melts the ice belo it, displaces the water nd sinks..in the final eq. position, itz upper surface is just inside . calculate initial temp of cube..neglet radiations...density of ice 900kg/m3  latent heat of fusion..336000j/kg

 

ans..353k

 

 

12]a brick of mass 4kg is dropped into a 1 m deep river frm a ht 2m..assume 80%of PE is converted into thermal energy...find thermal energy in calorie...

 

ans...23cal....

 

 

plz..reply...ill certailnly rate u.....u can answer at least 1...

 

 

 

 

 

whats the difficulty..??

 

q1.

 

first of all find the volume of water..as cube is just suffiecient to melt the whole piece of ice. so

 

 

8000.VCUBE . 470. = MICE.336000

 

NOW AS BLOCK JUST SINKS SO

 

APPLY CONDN. OF SINKING......THEN ITS EASY MAN...