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4300224102
21.01.2021 •
Physics
Calculate the heat energy needed to change the temperature of 2 kg of copper from 10°C to 110°C. If you could show your process and equations used, that would be very helpful! Thanks!
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Ответ:
77000 J
Explanation:
Formula for the heat energy is;
Q = m•c•Δt
We are given;
mass; m = 2 kg
Change in temperature; Δt = 110 - 10 = 100 °C
From online values, specific heat capacity of copper is; c = 385 J/kg.°C
Thus;
Q = 2 × 100 × 385
Q = 77000 J
Ответ:
E) 5100 m.
Explanation:
La persona observa el rayo en el tiempo ty luego escucha el trueno 15 segundos después, el tiempo t + 15.
El observador está a la misma distancia cuando ocurren ambos eventos.
Sabemos que la velocidad se da como la distancia dividida por el tiempo:
s = d / t
=> t = d / s
Para el rayo:
La velocidad de la luz es 3 * 10 ^ 8 m / s. Por lo tanto, el tiempo que tardó el rayo en recorrer una distancia d hasta el observador es:
t = d / 300000000000 (1)
Para el trueno:
La velocidad del sonido en el aire es de 341 m / s. Por lo tanto, el tiempo que tardó el trueno en viajar al observador es:
t + 15 = d / 341
=> t = d / 341 - 15 (2)
Por lo tanto, igualando (1) y (2):
d / 300000000 = d / 341 - 15
=> d / 341 - d / 300000000 = 15
d (1/341 - 1/300000000) = 15
d (0.002933) = 15
d = 15 / 0.002933
d = 5114 m ≅ 5100 m (a la centena más cercana)
Por lo tanto, el observador está a 5100 m.