Most plastics are manufactured into their final shapes using injection molding, where solid plastic pellets are melted and then pushed into a mold. In some injection molding machines, the heating is accomplished entirely by stirring the pellets. Alternatively, you could melt the pellets by shooting a single large projectile into the vat of pellets. The energy of the projectile in motion will be absorbed by the pellets, thereby increasing the temperature of the pellets, as the object comes to a stop within the vat. Suppose the vat contains 4.5 kilograms [kg] of plastic that has a specific heat of 3 joules per gram kelvin [JgK]. The plastic requires heating from room temperature of 70 degrees Fahrenheit [∘F] up to 500 degrees Fahrenheit [∘F]. The available projectile has a weight of 50 newtons [N]. Determine the velocity in meters per second [ms]at which the projectile must be shot into the vat to raise the temperature of the plastic by the required amount. Express the answer in scientific notation (Z.Z x 10Z).
Energy transfer
The flow of energy from one region to another region is referred to as energy transfer. Since energy is quantitative; it must be transferred to a body or a material to work or to heat the system.
Molar Specific Heat
Heat capacity is the amount of heat energy absorbed or released by a chemical substance per the change in temperature of that substance. The change in heat is also called enthalpy. The SI unit of heat capacity is Joules per Kelvin, which is (J K-1)
Thermal Properties of Matter
Thermal energy is described as one of the form of heat energy which flows from one body of higher temperature to the other with the lower temperature when these two bodies are placed in contact to each other. Heat is described as the form of energy which is transferred between the two systems or in between the systems and their surrounding by the virtue of difference in temperature. Calorimetry is that branch of science which helps in measuring the changes which are taking place in the heat energy of a given body.
Most plastics are manufactured into their final shapes using injection molding, where solid plastic pellets are melted and then pushed into a mold. In some injection molding machines, the heating is accomplished entirely by stirring the pellets.
Alternatively, you could melt the pellets by shooting a single large projectile into the vat of pellets. The energy of the projectile in motion will be absorbed by the pellets, thereby increasing the temperature of the pellets, as the object comes to a stop within the vat.
Suppose the vat contains 4.5 kilograms [kg] of plastic that has a specific heat of 3 joules per gram kelvin [JgK].
The plastic requires heating from room temperature of 70 degrees Fahrenheit [∘F] up to 500 degrees Fahrenheit [∘F].
The available projectile has a weight of 50 newtons [N].
Determine the velocity in meters per second [ms]at which the projectile must be shot into the vat to raise the temperature of the plastic by the required amount.
Express the answer in scientific notation (Z.Z x 10Z).
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