Answer:
It is enough
Explanation:
To develop the problem it is necessary to take into account the concepts related to the coefficient of performance of a pump.
The two ways in which the performance coefficient can be expressed are given by:

Where,
High Temperature
Low Temperature
And the other way is,

Where
is heat rate and W the power consumed.
We have all our terms in Celsius, so we calculate the temperature in Kelvin


The rate at which heat is lost is:

The power consumed by the heat pump is

And the coefficient of performance is



With this value we can calculate the Power required,




<em>The power consumed is consumed is 5kW which is more than 2.07kW so this heat pump powerful enough.</em>
Radius of SUN = 695,700 km
Radius of EARTH = 6,371 km
Answer:
The magnitude of the acceleration ae of the earth due to the gravitational pull of the moon is
Explanation:
By Newton's gravitational law, the magnitude of the gravitational force between two objects is:
(1)
With G the gravitational constant, M the mass of earth, m the mass of the moon and r the distance between the moon and the earth, a quick search on physics books or internet websites give us the values:




Using those values on (1)


Now, by Newton's second Law we can find the acceleration of earth ae due moon's pull:

Answer:
The fraction of kinetic energy lost in the collision in term of the initial energy is 0.49.
Explanation:
As the final and initial velocities are known it is possible then the kinetic energy is possible to calculate for each instant.
By definition, the kinetic energy is:
k = 0.5*mV^2
Expressing the initial and final kinetic energy for cars A and B:


Since the masses are equals:

For the known velocities, the kinetics energies result:




The lost energy in the collision is the difference between the initial and final kinectic energies:


Finally the relation between the lost and the initial kinetic energy:


Answer:
it takes 3 hours to travel
Explanation:
120 ÷ 40 = 3