An alien spy drone flies directly over a field at a speed of 0.50c. If the proper length of the field is 100 yards, what field length is measured by the drone?

When a 19 N force is applied, it compresses a spring by 0.085 m. Determine the period of oscillation of a 4.0-kg object making a simple harmonic motion with this spring.

A mass of a sculpture made of lead is initially 5 kg. What would be the increase in the mass of the sculpture when its temperature is increased by 525 C°. The specific heat capacity of lead is 128 J/(kg x C°).    

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?

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