Which of the following units could be used for the average speed of an object? A. kilometers per hour (km/hr) B. miles per hour
1 answer:
Answer : The correct option is, (D) all of these
Explanation:
Average speed : It is defined as the ratio total distance to total time. It is a scalar quantity that means it is defined by the magnitude only.
Formula used :
The common units of average speed are miles per hour (mph), kilometers per hour (kph), meters per second (m/s), or feet per second (ft/s).
The S.I unit of average speed is meter/second (m/s).
Hence, all of the units could be used for the average speed of an object.
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Given:
Height of tank = 8 ft
and we need to pump fuel weighing 52 lb/ to a height of 13 ft above the tank top
Solution:
Total height = 8+13 =21 ft
pumping dist = 21 - y
Area of cross-section = =
=16
Now,
Work done required =
=
= 832)
= 113152 = 355477 ft-lb
Therefore work required to pump the fuel is 355477 ft-lb