Acarnot air conditioner operates between an indoor temperature of 20°c and an outdoor temperature of 39°c. how much energy does it need to remove 2000 j of heat from the interior of the house? a. 340 j
b. 780 j
c. 105 j
d. 130 j
e. 520 j

D. 130 J

Explanation:

The coefficient of performance for a machine that is being used to cool, is given by:

Here  is the heat removed from the cold reservoir, W is the work required, that is, the energy required to remove the heat from the interior of the house, is the cold temperature and is the hot temperature. Recall use absolutes temperatures(). Replacing and solving for W:

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.