1. Lifting an elevator 18m takes 100kJ. If doing so takes 20s, what is the average power of the elevator during the process? 2. How much work can a 0.4 hp electric mixer do in 15 s?​

1. Power = 5000 Watts

2. Workdone = 11185.5 Joules

Explanation:

Given the following data;

1. Distance = 18 m

Energy = 100 KJ = 100,000 Joules

Time = 20 seconds

To find the average power of the elevator;

Power = energy/time

Power = 100000/20

Power = 5000 Watts

2. Power = 0.4 HP

Time = 15 seconds

Conversion:

1 horsepower = 745.7 Watts

0.4 horsepower = 0.4 * 745.7 = 298.28 Watts

To find the amount of work done by the electric mixer;

Work done = power * time

Workdone = 745.7 * 15

Workdone = 11185.5 Joules

the word that best describes martin luther king jr.'s tone in the video is dignified

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float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it