Knowing the specific heat capacity, mass and heat released, how many degrees do you reduce the tempe

To query the data, it is necessary to know the starting temperature of the object, and the number of degrees of temperature reduction can be calculated according to the formula

According to the theorem, the following formula can be derived at the most basic:

q is the heat. c is the specific heat capacity in joules.

per kilogram of Kelvin.

j/( kg · k )]

m is the quality. t is the temperature change value.

t=q cm is obtained

Expansion: Specific heat capacity (symbol C), referred to as specific heat capacity, also known as specific heat capacity.

It is a physical quantity commonly used in thermodynamics.

Indicates the ability of an object to absorb heat or dissipate heat. The greater the specific heat capacity, the greater the ability of the object to absorb heat or dissipate heat. It refers to the amount of heat absorbed or emitted by a unit temperature of a certain substance per unit mass as it rises or falls.

The larger the specific heat capacity, the more heat energy is required to heat the substance. For example, the specific heat capacities of water and oil are about 4200 J (kg·k) and 2000 J (kg·k), respectively, that is, the heat energy of heating water is about twice as high as that of oil. If water and oil are heated separately with the same heat energy, the temperature rise of the oil will be greater than that of water.

Carnot's theorem states that the efficiency of reversible cycling is only related to the temperature of the high-temperature heat source and the low-temperature heat source, and not to other factors such as the working substance (working fluid) or the working path.

Thermodynamic temperature.

Also known as absolute temperature.

It is one of the important parameters in thermodynamics and statistical physics. Absolute zero, commonly referred to as absolute zero.

It refers to 0K, which corresponds to Celsius.

Answer: It can be calculated according to the formula q=cm t. That is, the level of its temperature reduction is.

t=q/(cm)

q = cm (t2-t1), knowing the heat q, the specific heat capacity c and the temperature increase (t2-t1), then the mass m = q c (t2-t1).

Specific heat capacity refers to the amount of heat required to increase the temperature of 1kg of homogeneous substances by 1k when there is no phase change and chemical change.

Using the concept of specific heat capacity, it is possible to deduce a molar heat capacity that represents the amount of heat required to raise 1 k of a mol of substance. And the molar heat capacity cp under isobaric conditions is called constant pressure molar heat capacity. The molar heat capacity CV under isochoric conditions is called the constant volume molar heat capacity.

The relationship between the constant pressure molar heat capacity and temperature is usually correlated as a polynomial.

The unit of specific heat capacity is the composite unit.

In the International System of Units, the principal units of energy, work, and heat are unified as joules, and the principal units of temperature are Kelvin, so the SI unit of specific heat capacity is j·kg-1·k-1, which is read as "joules per kilogram of Kelvin". SI units may be j (kg· ) Reads "joules per kilogram Celsius."

Common unit: j (kg· ) j (g· )kj (kg· )cal (kg· )kcal (kg· )etc. Note that Celsius and Kelvin differ only in the representation of the temperature scale, and are equivalent in the sense of the magnitude of the temperature difference, so that and k in these units can be arbitrarily substituted with each other.

For example, "joules per kilogram Celsius" and "joules per kilogram open" are equivalent.

The heat absorbed is Q = cm t, where c - specific heat capacity, in j kg, m - mass, unit kg; t – elevated temperature, unitFind the absorbed heat q, in joules (j).

The unit of heat is the unit of work, so p=q t, t - time, the unit of the second (s); The P is the absorbed power, and the unit is watts (W), because 1J = 1W 1 second.

The specific heat capacity is represented by the symbol c, and its unit is j (kg?).℃）

What is the specific heat capacity of sand and gravel? The physical meaning of its representation is that the mass of sand and gravel is 1kg, the temperature rises by 1, and the heat absorbed is.

So the answer is: c; j/（kg?The mass of sand and gravel is 1kg, the temperature rises by 1, and the heat absorbed is.

1) The temperature of the ice does not change when it melts (or the endothermic temperature of the ice increases) (1 point) 2 points).

Points) 100w (2 points) J kg (2 points).

q=cm(t2-t1)

Knowing that the heat q of the world burning family is more constrictive than the hot search c, and knowing that the temperature increases (t2-t1), the mass m=q c(t2-t1).

Dear, please don't forget in time. If you have any questions, I will be ready to help you.

It is known that m=100g= temperature difference=65 -30 degrees Celsius=35. q put=.

Find the difference of the object to the heat god c from the formula q=cm t to get c=q divided by m t= slip)=j (kg) which seems to be the specific heat capacity of kerosene. Go check the form yourself and answer it.

The ratio of the heat absorbed by a substance when the temperature rises to the product of the mass and the temperature that rises, is called the specific heat capacity of the substance The specific heat capacity is a physical property of the substance itself, which determines the state bridge to the type and state of the substance, and has nothing to do with the amount of heat absorbed, the amount of the increased temperature, and the amount of mass Therefore, ABC is wrong, D is correct

Therefore, choose D

(1) The mass of the ice is, the ice melts into water, the state changes, the mass does not change, the mass of the water is, as known from the image, in the CD segment, the water rises from 0 to 20, and the heat absorbed by the water is: Q=CM T=?20 = ice or water absorbs the same amount of heat as in the CD segment, water from 0 liters.