Ask Experts Questions for FREE Help !
Ask
    angelkem's Avatar
    angelkem Posts: 0, Reputation: 1
    New Member
    		  
    #1

    Jan 10, 2011, 04:23 AM
    work, power, energy and mechanics..
    THE QUESTION:
    A laborer who weights 600 N is to carry 5 sacks of rice from the ground to the second floor of a storehouse. If the distance between floors is 3.5 m and the mass of each sack is 50 kg, find the total work done against gravity if the laborer carries only one sack at a time.

    MY QUESTION:
    how can I solve this problem?
    I was answering it and I don't know if I wrote the correct formula..

    Given:
    Mp = 600 N
    Ms = 50 kg
    dy = 3.5 m

    Solution:
    W = total work(mass)(gravity)(height/distance)
    = (Mp + Ms)(9.8 m/s squared)(3.5 m)
    = (600 + 50)(9.8 m/s squared)(3.5 m)
    = 22,295 Joule

    Did I answer it right? ***. Help...
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
    Uber Member
    		  
    #2

    Jan 10, 2011, 11:01 AM

    Not quite...

    If the weight of the labourer is 600 N, he will have a mass of 600/g, that is 61.2 kg. The total mass then becomes 61.2 + 50 = 111.2 kg.

    This will give you the work done for taking 1 sack. There are 4 more to go, so, 4 times as much work will be done!

    What do you get now? :)
Not your question? Ask your question View similar questions
 

Question Tools Search this Question
Search this Question:

Advanced Search

Add your answer here.


Check out some similar questions!

Work, energy, power [ 1 Answers ]

Rowan and jean are tobogganing on an old pasture with rolling hills. At A the hill is 14m high; at B, 2.8m, at A, the toboggan is just beginning to slide. a)if there is no loss of mechanical energy, what is the velocity of the toboggan at B? b) if 25% of the mechanical energy at A is lost by B,...

Work, energy, power unit grade 11 physics [ 4 Answers ]

A high school student shoots a 0.04 kg arrow straight up in the air at 30 m/s during an archery class in the school gym. a) assuming no air resistance, what is the max height that the arrow could reach?

Energy, Work and Power [ 2 Answers ]

caculate the number of revolutions of the shaft required to raise a load through 1.2m. Diameter of the shaft=10.0m mass of the load=0.5kg time taken to raise the load through 1.2m=5.0s assuming that the thickness of the thread can be ignored and that the gravitational force acting on a mass of...

Energy, power latent heat - data analysis - power storage systems [ 33 Answers ]

1. One possible design for a storage power station is to use off-peak energy to compress air into a sealed underground canve and then, during periods of high demand, to reverse the system so that the air can drive a generator. one system of this type compresses air from the atmospheric pressure...

Grade 11-energy and power [ 6 Answers ]

How do you find output energy given only Power (1500 W) and delta time (173 s) ?

View more questions Search