rezboy97
28.06.2019 •
Mathematics
Atractor drags a 300 lb. concrete block 80 ft. in 120 seconds. determine the power output of the tractor.
2400 ft-lb/sec
300 ft-lb/sec
200 ft-lb/sec
120 ft-lb/sec
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Ответ:
For this case we have that by definition, the mechanical power is given by:
Where:
W: It is the work done
t: It's time
For its part:
Where:
F: It is the applied force
d: It is the distance traveled
According to the data we have that the drag force of the tractor is , while the distance traveled is
Substituting:
Finally, the power is:
Option C
Ответ:
D-5
Step-by-step explanation:
The median is the little line in the middle of the box.
It dropped 2.5 spaces.
Each space worth 2.
2x2.5=5