This is a graph of a marble traveling across a smooth surface. what is the average speed of this marble?

a. 1.5 m/s

b. 15 m/s

c. 0.67 m/s

d. 150 m/s

When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

Select all the correct answers.which two statements are true? a moving magnetic field creates an electric field.a constant magnetic field creates an electric field.a constant electric field creates a magnetic field.a moving electric field creates a magnetic field.resetnext

Two kilograms of air within a piston–cylinder assembly executes a carnot power cycle with maximum and minimum temperatures of 800 k and 300 k, respectively. the heat transfer to the air during the isothermal expansion is 60 kj. at the end of the isothermal expansion the volume is 0.4 m3. assume the ideal gas model for the air. determine the thermal efficiency, the volume at the beginning of the isothermal expansion, in m3, and the work during the adiabatic expansion, in kj.