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:

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me