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?
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Ответ:
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
Ответ:
A vessel operator is required to use navigation lights at all times under the listed conditions, however, the required lights vary for the different conditions listed. The various lights provide other vessel operators with important information.
Explanation:
When moored at dock, the operator must display a white light visible in all directions as well as when anchored outside a designated mooring area between sunset and sunrise.
During a period of restricted visibility such as fog, operator must display Red and green sidelights visible from a distance of at least two miles away