A heat engine operates in a Carnot cycle between reservoirs of temperatures 1000 K and 400 K. It is found to discharge 20 J of heat per cycle to the cold reservoir. What is the work output per cycle?

A heat engine operates in a Carnot cycle between reservoirs of temperatures 1000 K and 400 K. It is found to discharge 20 J of heat per cycle to the cold reservoir. What is the work output per cycle?

On a cold winter day, the outside temperature is –5.0 °C while the interior of a well-insulated garage is maintained at 20.0 °C by an electric heater.  Assume the walls have a total area of 75 m2, a thickness of 0.15 m, and a thermal conductivity of 0.042 W/(m · C°).  What is the cost to heat the garage for six hours at these temperatures if the cost of electricity is $ 0.11/kWh?  Note: 1 kWh = 3.6 × 106 J.  

A 4.0-g sample of ice at 0.0 °C falls through a distance of 30.0 m and undergoes a completely inelastic collision with the earth.  If all of the mechanical energy is absorbed by the ice, how much of it melts?

A balloon is released from a tall building. The total mass of the balloon including the enclosed gas is 2.0 kg. Its volume is 5.0 m3.  What is the magnitude of the initial acceleration of the balloon?

Menores costos de compensación para trabajadores y menor rotación de empleados

El empleador debe inspeccionar los procedimientos específicos de control de energía del equipo al menos:

What is the concentration of a solution, in M, made by diluting mL of a M solution of potassium sulfide to a total volume of mL?

Si los materiales combustibles cercanos no pueden ser removidos o protegidos, la guardia de incendios debe estar estacionada en el área después de que se hayan completado las operaciones de soldadura durante ___ minutos.

Menores costos de compensación para trabajadores y menor rotación de empleados