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kondor19780726 [428]
3 years ago
15

Calculate the heat energy needed to change the temperature of 2 kg of copper from 10°C to 110°C.

Physics
2 answers:
Stells [14]3 years ago
8 0

Answer:

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

velikii [3]3 years ago
3 0

Answer:

heat = 20 Kcal

Explanation:

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Which statement describes how work and power are similar?
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Answer:

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3 years ago
A 25kg box in released on a 27° incline and accelerates down the incline at 0.3 m/s2. Find the friction force impending its moti
Crank

Answer:

a)  μ = 0.475 , b)   μ = 0.433

Explanation:

a) For this exercise of Newton's second law, we create a reference system with the x-axis parallel to the plane and the y-axis perpendicular to it

X axis

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     fr = μ N

y Axis

     N - W_{y} = 0

let's use trigonometry for the components the weight

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         μ = tan 25 - 0.3 / 9.8 sec 25

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         μ = 0.433

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