According to Wright & Denisova (2024), which mechanic was found to be most effective in enhancing moral reflection and meaningful player engagement?

An important feature of the Carnot cycle is that

According to the lecture, how does personality influence social behavior in online games?

The water flowing over a waterfalls drops a distance of m. If all the gravitational potential energy is converted to thermal energy, by what temperature does the water rise? The specific heat of water is 4186 J/kg ∙ K.

A kg copper bar is put into a smelter for melting. The initial temperature of the copper is  K. How much heat must the smelter produce to completely melt the copper bar? The specific heat for copper is 386 J/kg∙K, the heat of fusion for copper is 205,000 J/kg, and its melting point is 1357 K.

Calculate the net change in entropy when 3 kg of hot water at 900C is mixed with 1 kg of cold water at 100C.  The specific heat of water is 4186 J/kg/K. ( Show your work in the space provided here)

You are making a circular turn in your car on a horizontal road when you hit a big patch of ice, causing the force of friction between the tires and the road to become zero. While the car is on the ice, it

A coin of mass m rests on a turntable a distance r from the axis of rotation. The turntable rotates with a frequency of f. What is the minimum coefficient of static friction between the turntable and the coin if the coin is not to slip?

Two horizontal forces act on a 10.0-kg mass. One force has a magnitude of 8.0 N and is directed due north. The second force toward the east has a magnitude of 6.0 N. What is the acceleration of the mass?

A researcher wants to know if the number of practice quizzes that a student completes has any impact on their exam grade, and sets up an experiment to learn more. Write a null hypothesis for the researcher.