A 2.1W iPod is used for 30 minutes. How much energy does it use? (3
2 answers:
Answer:
Energy used, E = 3780 Joules
Explanation:
It is given that,
Power, P = 2.1 W
Time, t = 30 minutes = 1800 seconds
We need to find the energy used by the iPod. The product of power and time is called energy used i.e.
E = P × t
E = 3780 Joules.
So, the energy used by the iPod is 3780 Joules. Hence, this is the required solution.
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Answer:
Final temperature, T2 = 314.9 Kelvin
Explanation:
Given the following data:
Mass = 0.9kg
Initial temperature, T1 = 10°C to Kelvin = 10 + 273 = 283K
Quantity of heat = 120,000 J
Specific heat capacity = 4182 j/kgK
To find the final temperature;
Heat capacity is given by the formula;
Where;
Q represents the heat capacity or quantity of heat.
m represents the mass of an object.
c represents the specific heat capacity of water.
dt represents the change in temperature.
Making dt the subject of formula, we have;
Substituting into the equation, we have;
dt = 31.9K
Now, the final temperature T2 is;
But, dt = T2 - T1
T2 = dt + T1
T2 = 31.9 + 283
T2 = 314.9 Kelvin