Answer:
The ball will lose heat at the rate of 0.072 J/min.
Explanation:
According to the Newton's cooling law, the rate of cooling R is given by the formula.
R=-k(T-To)
where k is a constant, T is the temperature of the object and To is the temperature of the surrounding.
Initially, R=0.15 J/min, To=700 K and T=950 K.
So 0.15=-k(950-700)
k=-0.15/250 J/K min.
Finally, To=700 K and T=820 K
R=-(-0.15/250)(820-700)
R= 0.072 J/min
Know more about Newton's cooling law.
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The process is denitrification
There are only two things you can do to increase the work output of a machine:
1). Increase the work INput to the machine.
2). Make the machine more efficient ... do things like lubricating it better to eliminate some internal friction.
Answer:
25000J
Explanation:
Formula : Q = m×c×Δt
Q=Heat energy
m= mass
c=specific heat capacity
ΔT = change in temperature.
Q=M x C for this question.
Specific heat capacity = 2500 J/Kg
Mass = 10kg
2500 x 10 = 25000 J