Can You Answer These Questions On 8th Grade Physics?

Explanation
The units of specific heat capacity are J/kgoC. This represents the amount of heat energy required to raise the temperature of one kilogram of a substance by one degree Celsius. The unit "J" stands for joules, which is the standard unit of energy, "kg" represents kilograms, and "oC" represents degrees Celsius.

Explanation
The amount of thermal energy a material can store is influenced by both the temperature change and the mass. The temperature change determines how much the material's internal energy will increase or decrease, while the mass determines the amount of material available to store thermal energy. Therefore, both factors are important in determining the amount of thermal energy a material can store.

Explanation
The symbol used to represent the specific heat capacity of a material is "c".

Explanation
To find the mass of the copper block, we use the formula for heat transfer, which relates the heat transferred to the mass, specific heat capacity, and change in temperature of the material. Given the heat transferred (35,000 J), specific heat capacity of copper (385 J/kg°C), and temperature change (15°C), we substitute these values into the formula to find the mass. This calculation yields a mass of approximately 6.06 kilograms for the copper block.

Explanation
To calculate the specific heat capacity of the copper block, the mass of the copper block, starting temperature, and the Joulemeter reading at the start and end are required. The time taken is not needed in this calculation, as the specific heat capacity is determined by the amount of heat energy transferred, which is obtained from the Joulemeter readings and not influenced by the time taken.

Explanation
The amount of energy required to raise the temperature of a substance can be calculated using the formula Q = m * c * ΔT, where Q is the energy transferred, m is the mass of the substance, c is the specific heat capacity of the substance, and ΔT is the change in temperature. In this case, the mass of water is 2 kg, the specific heat capacity of water is 4,200 J/kgoC, and the change in temperature is 40oC - 27oC = 13oC. Plugging these values into the formula, we get Q = 2 kg * 4,200 J/kgoC * 13oC = 109,200 J, which is equal to 109.2 kJ.

Explanation
The specific heat capacity of a substance is the amount of heat required to raise the temperature of 1 kilogram of the substance by 1 degree Celsius. In this case, the coolant has a specific heat capacity of 3,800 J/kgoC.

We are given that 91.2 kJ of energy is transferred to the surroundings. To find the temperature of the coolant leaving the radiator, we can use the equation:

Heat transferred = mass * specific heat capacity * change in temperature

Converting the heat transferred to joules:

91.2 kJ = 91,200 J

Rearranging the equation to solve for the change in temperature:

Change in temperature = Heat transferred / (mass * specific heat capacity)

Substituting the given values:

Change in temperature = 91,200 J / (1.5 kg * 3,800 J/kgoC)

Change in temperature = 40 oC

Since the initial temperature of the coolant is 114 oC, the temperature of the coolant leaving the radiator would be:

114 oC - 40 oC = 74 oC

Therefore, the correct answer is 98 oC.

Explanation
The specific heat capacity of a substance is the amount of heat energy required to raise the temperature of 1 kg of that substance by 1 degree Celsius. In this case, the stove casing, which is made from 120 kg of cast iron, required 3,276 kJ of energy to raise its temperature from 18oC to 70oC. To find the specific heat capacity, we divide the amount of energy by the mass and the change in temperature: 3,276 kJ / (120 kg * (70oC - 18oC)) = 525 J/kgoC. Therefore, the specific heat capacity of the cast iron is 525 J/kgoC.

Explanation
Substances with a low specific heat capacity can store some thermal energy. Specific heat capacity refers to the amount of heat energy required to raise the temperature of a substance by a certain amount. When a substance has a low specific heat capacity, it means that it requires less heat energy to increase its temperature. Therefore, it can store some thermal energy, although not as much as substances with higher specific heat capacities.

Explanation
Water has a higher specific heat capacity than mineral oil, which means that it can absorb and store more thermal energy per unit mass. Therefore, the statement "Water can store more heat than the same mass of mineral oil" is correct.