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amuijakobp78deg
06.09.2019 •
Physics
The boom of a fire truck raises a fireman (and his equipment – total weight 280 lbs) 60 ft into the air to fight a building fire. (a) showing all your work and using unity conversion ratios, calculate the work done by the boom on the fireman in units of btu. (b) if the useful power supplied by the boom to lift the fireman is 3.50 hp, estimate how long it takes to lift the fireman
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Ответ:
Explanation:
Given that,
Weight = 280 lbs
Height = 60 ft
Power = 3.50 hp
(a). We need to calculate the work done by the boom on the fireman
Using formula of work done
Put the value into the formula
The work done by the boom is 21.59 Btu.
(b). We know that,
1 hp = 550 ft lbf
So,![P = 3.50\times550](/tpl/images/0224/8375/424cd.png)
We need to calculate the time
Using formula of time
Put the value into the formula
The time is 8.7 sec.
Hence, This is the required solution.
Ответ:
your answer is !