One kilowatt hour (kWh) is the amount of work or energy generated when one kilowatt of power is supplied for a time of one hour.
1 answer:
The definition of Power tells us that it is the amount of Energy supplied during a certain period of time.
In this case 1 kWh is the amount of energy released during a period of 60 minutes to replace a given task.
In practical terms 1kW hour is the equivalent of one thousand Watts, that is
Where
P = Power
E = Energy
t = time
The power is equal to 1000W or 1000J/s through a hour, then
Therefore the number of Joules of energy in one Kilowatt hour are
You might be interested in
Answer:
The car stops in 7.78s and does not spare the child.
Explanation:
In order to know if the car stops before the distance to the child, you take into account the following equation:
(1)
vo: initial speed of the car = 45km/h
a: deceleration of the car = 2 m/s^2
t: time
xo: initial distance to the child = 25m
x: final distance to the child = 0m
It is necessary that the solution of the equation (1) for time t are real.
You first convert the initial speed to m/s, then replace the values of the parameters and solve the quadratic polynomial for t:
You take the first value t1 because it has physical meaning.
The solution for t is real, then, the car stops in 7.78s and does not spare the child.
Answer:
Respuesta correcta, opción D: Es la fuerza que un cuerpo ejerce perpendicularmente sobre el área en la que actúa.
Explanation:
La definición de presión es la fuerza que un cuerpo ejerce en dirección perpendicular sobre el área en la que actúa.
Cuando se aplica una fuerza sobre la superficie de un cuerpo, la presión es la siguiente:
En donde:
F es la fuerza aplicada.
A es el área del cuerpo.
Por lo tanto la opción correcta es la D: es la fuerza que un cuerpo ejerce perpendicularmente sobre el área en la que actúa.
Espero que se sea de utilidad!