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malachijwilson5
05.03.2022 •
Physics
Which two structures do most plants use to gather nutrients and produce energy.
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Ответ:
The mass of water that the coffee machine can heat in 14 seconds is equal to 0.1204 kg.
Explanation:Given:
Initial temperature of water =![T_1=20\°C](/tpl/images/0464/6836/88217.png)
Final temperature of water =![T_2=90\°C](/tpl/images/0464/6836/e3c64.png)
Power of coffee machine =![P=2.53\ KW](/tpl/images/0464/6836/a07a1.png)
Specific heat capacity of water =![c=4200\ J/kg\°C.](/tpl/images/0464/6836/95074.png)
Time for which water is heated =![t=14\ s](/tpl/images/0464/6836/141d3.png)
Mass of water = m = ?
Power is defined as work done in unit time. Let the heat energy be Q. Power (P) is defined as
where t denotes the time for which energy is supplied. Q can be rewritten as:
Formula for Heat energy is given by
Q = m×c×Δt ........................................(2)
where:
Q = Heat energy (in J)
m = mass of the substance being heated in grams(kg)
c = the specific heat of the substance in J/(kg.°C)
Δt = Change in temperature (in °C)
Δt = (Final temperature - Initial temperature) =
.......................(3)
From (1) and (3), solving equation (2) for m;
Q = m×c×Δt
The mass of water that the coffee machine can heat in 14 seconds is equal to 0.1204 kg.