Efficiency = output / input 100, so in this case power output / power input
Power output = W / t, where the work done is the equal to the change in kinetic energy of a ball
Pout = (0.5mv^2 - 0) / t = 0.5 0.028 100^2 / 0.2 = 700 W
efficiency = 700 / 2000 100 = 35%
I think it is ccccccc
The correct answer to this question is B, which is 7.05 J/kg K. The answer to this question is found by using formulas used in thermal physics. Thermal physics is the study of thermodynamics, kinetic theory, and statistical mechanics and is studied by physics students.
This study starts with the fundamental understanding of heat and temperature. It then uses these fundamentals to analyze the first and second laws of thermodynamics. The main topic in thermal physics is canonical probability distribution. Along with this, there are many other topics in thermal physics including Gibbs free energy, chemical potential, Helmholtz free energy, Bose-Einstein condensation, and phase equillibrium.