Work and Kinetic Energy of barrel

In summary, a 45.0 kg barrel is lifted 6.60 m by a cable exerting 710 N. The work done against gravity to lift the barrel is 2,910 J and the net work done on the barrel is also 2,910 J.
  • #1
ScienceGirl90
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Homework Statement


A 45.0 kg barrel is raised 6.60 m (from rest) by cable that exerts 710 N on the barrel. Neglecting any frictional energy losses, how much work is done against gravity to lift the barrel and what is the net work done on the barrel?



Homework Equations


W=m*g*h
W=F*D


The Attempt at a Solution


I am confused about the wording, "against gravity". Also when I tried to find the net work done on the barrel I did W=(45.0kg)(9.80m/s/s)(6.60m)= 2910 J. Is that right?
 
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  • #2
against gravity means you are lifting the object, opposing the action of gravity.
So your W(net) = W(grav) + W(cable)

now apply W=mgh for both cases, (keeping in mind the signs), and add them to get your net work.
 

1. What is the definition of work and kinetic energy?

Work is defined as the force applied to an object multiplied by the distance the object moves in the direction of the force. Kinetic energy is the energy an object possesses due to its motion.

2. How is work and kinetic energy related to a barrel?

Work and kinetic energy are related to a barrel in the sense that when a force is applied to the barrel, such as rolling it up a hill, work is being done on the barrel and it gains kinetic energy as it moves.

3. How does the weight of a barrel affect its work and kinetic energy?

The weight of a barrel affects its work and kinetic energy because a heavier barrel will require more force to move and therefore more work will be done on the barrel. This will result in the barrel having more kinetic energy as it moves.

4. Can the work and kinetic energy of a barrel be calculated?

Yes, the work and kinetic energy of a barrel can be calculated using the formulas: work = force x distance and kinetic energy = 1/2 x mass x velocity^2. The values for force, distance, mass, and velocity can be measured or estimated to calculate the work and kinetic energy of a barrel.

5. How does friction affect the work and kinetic energy of a barrel?

Friction can decrease the work and kinetic energy of a barrel by opposing the motion of the barrel. This means that more work must be done to overcome the force of friction and the barrel will have less kinetic energy as it moves.

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