A metal ball of mass 100 g is heated to 90°C and then cooled to 25°C. The heat lost in the process is 2.5 kJ. Another metal ball
2 answers:
<span>specific heat (
) - the heat required to raise the temperature of the unit mass of a given substance by a given amount (usually one degree)
the equation related to this theory is
</span><span>
Where Q is the energy gained or lost from the system
m is the mass of the object
</span><span>
is the specific heat of the material
is the change in temperature
</span>
the equation related to this theory is
</span><span>
Where Q is the energy gained or lost from the system
m is the mass of the object
</span><span>
</span>
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Answer:
Number of quarters → 15
Number of dimes → 2
Step-by-step explanation:
Let the number of dimes I have = y
And number of quarters = x
Since, I have amount in my pocket = $2
Therefore, 0.10y + 0.25x = 2
100(0.10y + 0.25x) = 100×2
25x + 10y = 200
5x + 2y = 40
2y = -5x + 40
y = -2.5x + 20 ---------(1)
Total number of coins in my pocket = 17
x + y = 17
y = -x + 17 ---------(2)
By using a graphing calculator we can graph these two lines (As attached)
Solution of the given system of equations will be the point of intersection of these lines.
Solution → (2, 15)
Number of quarters → 15
Number of dimes → 2
