What is the saros cycle? a) the annual cycle of the seasons b) the 26,000-year cycle of the earth's precession c) the roughly one-month cycle of lunar phases in the sky d) the roughly 18-year cycle over which the pattern of eclipses repeats

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

An insulated 40 ft^3 rigid tank contains air at 50 psia and 120°f. a valve connected to the tank is now opened, and air is allowed to escape until the pressure inside drops to 25 psia. the air temperature during this process is kept constant by an electric resistance heater placed in the tank. determine the electrical work done during this process.

Which best describes the first law of thermodynamics as compared to the second law of thermodynamics? a. the first law describes how thermal energy is conserved but not the direction it moves. b. the first law describes the direction thermal energy moves but not how it is conserved. c. the first law describes how thermal energy can be created but not how it can be destroyed. d. the first law describes how thermal energy can be destroyed but not how it can be created.