Chọn phát biểu đúng. Trong công thức của chuyển động thẳng nhanh dần đều: A. v luôn luôn dương. B. a luôn dương.
C. a luôn cùng dấu với v. D. a luôn ngược dấu với v.

The mass of the piece of copper is equal to 121.2 g when its specific heat capacity is 0.385 J/g°C.

What is the specific heat capacity?

The specific heat capacity can be described as the amount of heat required to raise the temperature in one kilogram of a substance by one-degree Celcius.

The temperature of the material will change whenever the heat is absorbed or lost by it.

Q = mCΔT

Given, the amount of energy transferred, Q = 3500 J

The change in the temperature = 225 - 150 = 75 °C

The specific heat capacity of the copper, C = 0.385 J/g°C

The mass of the piece of copper for the given change in temperatures can be calculated as:

3500 J = m × (0.385 J/g°C) × 75°C

m = 121.2 g

Therefore, the mass of the piece of copper is equal to 121.2 g.

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Answer:

121 on edge 23

Explanation:

Answer:

 J

Data;

• Power = 1200W
• Time/day = 10 mins

Power

The is the rate of energy used to time. It is the measure of expedience of energy.

a). How many minutes is the dryer used in a month.

Assuming there 30 days in a month;

This shows that the dryer is used 300 minutes in a month.

b). How many hours is the dryer used in a month.

To solve this problem, we simply need to convert the value of (a) from minutes to hours.

The dryer was used for a total of 5 hours in a month.

c). The power of the dryer in  kilowatt.

To convert the power in watt to kilowatt, we divide by 1000.

The power in kilowatt is 1.2kw

d). How many kilowatt/hr of electricity used in a month.

The dryer consumes 6kw/h in a month.

e). If the town charges $0.15/kwh, the cost in a month

The cost of the dryer in a month is $0.9.

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