An elevator is designed such that when traveling upward, it has a constant acceleration from rest to its cruising speed of 2.00 m/s in a time of 3.00 s. The elevator has a mass of 675 kg and you may ignore friction. What is the average power of the elevator motor during this period?

The average power of the elevator motor during this period is 450 W .

Explanation:

Given :

Initial velocity , u = 0 m/s .

Final velocity , v = 2 m/s .

Time taken , t = 3 s .

Mass of elevator , M = 675 kg .

We need to find the average power of the elevator motor during this period.

Now , we know power is given by :

Now , work done is given by :

W=F.d

Here , F is the force applied and d is the distance covered .

Now , acceleration is given by :

Also , displacement is :

Therefore , work done is :

SO , power P is :

Therefore , the average power of the elevator motor during this period is 450 W .

freezing

deposition

condensation

explanation;

melting also called fusion is the process where solid becomes liquid, sublimation is the process where solid becomes gaseous without first changing to liquid, deposition involves change from gaseous to solid state, freezing involves change from liquid to solid, boiling or evaporation involves change of liquid to gaseous state, while condensation is the change from gaseous state to liquid state.

endothermic reactions involves absorption of heat from the surroundings or the environment while exothermic reactions involves loss of heat energy to the surroundings.

in this case, sublimation, evaporation and melting are endothermic reactions (gain energy from the environment) while, freezing, deposition and condensation are exothermic (loss of energy to the surroundings) reactions.

because growing process had stoped after 4-5 year