A body of mass 5 kg falls from a height of 30 m it all mechanical energy is changed into heat and the heat produced will be
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Answered by
1
As, mass(m) = 5kg
height (h) = 30m
acceleration due to gravity(g) =
9.8m/s2
Therefore, mechanical energy= total potential energy of body at height of 30m= mgh = 5*9.8*30 = 1470Joules
As, all of the mechanical energy is changed into heat energy
Therefore, heat energy produced = 1470J
Anonymous:
wrong
mechanical energy is potential plus kinetic energy
wrong answer
Yes, it's true that mechanical energy is potential energy plus kinetic energy
But in this case, at the height of 30m body was possessing mechanical energy only in the form of potential energy
Answered by
0
ANSWER
SEE, MECHANICAL ENERGY = POTENTIAL ENERGY+KINETIC ENERGY
SO,
P.E= m*g*h
and, 5kg*9.8*30
potential energy= 1470joules
K.E= 1/2 *M*v^2
1/2*5*(9.8)^2
= 240.1JOULES
MECHANICAL ENERGY = 240.1+ 1470
M.E.= 1710.1
we know, mechanical energy changed into heat energy so
M.E= Heat energy
so,
Heat energy is 1710.1 joules,, Ans
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