Your job is to lift 30-kg crates a vertical distance of 0.90 m from the ground o

Question

Your job is to lift 30-kg crates a vertical distance of 0.90 m from the ground onto the bed of a truck.

Part A

How many crates would you have to load onto the truck in one minute for the average power output you use to lift the crates to equal 0.50 hp?

Express your answer using two significant figures.

  1/min

Part B

How many crates for an average power output of 100 W?

Express your answer using two significant figures.

  1/min

Part B

How many crates for an average power output of 100 W?

Express your answer using two significant figures.

Explanation / Answer

here,

1 watt = 0.134102 hp

mass of crates, m = 30 kg
height, h = 0.90 m
time, t = 60 s

As,
Power = Work done/Time = Force*Distance/time = mg*h/T
net power needed , p
p = (30 * 9.8*0.90)/60
p = 4.41 watts
or
p = 0.00592 hp

part A :
no of crates = (0.05/0.00592) = 85

Part B:
p = 100 watt
no of crates = (100 /4.41 ) = 23

Related Questions

Navigate

• Browse (All)
• Browse Y
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.