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potential energy
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How much work is done in lifting a 50kg object to height of 5m?
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What is the relationship between work and gravitational potential energy?
Work = energy (by the Work-Energy Equivalence Theorem).The work done in lifting an object shows up as the gravitational potential energy of the object: W = mgh, where W is the work done; m is the object's mass; g is the acceleration due to Earth's gravity; and h is the height to which the object is lifted. (This assumes that the lifting is done near Earth's surface, with gravity effectively constant.)ALL Credit goes to Argent at yahoo answers
What is The work done holding a 50 kg object at a height of 2 m above the floor for 10 seconds?
The answer is 0. If you used the formula of =>mgh, you would get a value which would be wrong. The question is a trick question. There is no work done in 'holding' an object but work would be done in 'lifting' an object. Hence, 0. ~Dartz
When we carry an object across a room without lifting it or setting it down we do no physical work on it?
That's correct. For work to be done, the force must have a component in the direction of the movement.
How much work is done in lifting a 20 kg object through a distance of 0.40 m Use g 10 ms?
Work Done= Force X Distance moved by the object in the direction of the force = 20kg X 10N/kg X 0.40m = 80J
How much work is done in lifting a 50kg object to height of 5m?
anser
What is the relationship between work and gravitational potential energy?
Work = energy (by the Work-Energy Equivalence Theorem).The work done in lifting an object shows up as the gravitational potential energy of the object: W = mgh, where W is the work done; m is the object's mass; g is the acceleration due to Earth's gravity; and h is the height to which the object is lifted. (This assumes that the lifting is done near Earth's surface, with gravity effectively constant.)ALL Credit goes to Argent at yahoo answers
What is The work done holding a 50 kg object at a height of 2 m above the floor for 10 seconds?
The answer is 0. If you used the formula of =>mgh, you would get a value which would be wrong. The question is a trick question. There is no work done in 'holding' an object but work would be done in 'lifting' an object. Hence, 0. ~Dartz
When we carry an object across a room without lifting it or setting it down we do no physical work on it?
That's correct. For work to be done, the force must have a component in the direction of the movement.
How much work is done in lifting a 20 kg object through a distance of 0.40 m Use g 10 ms?
Work Done= Force X Distance moved by the object in the direction of the force = 20kg X 10N/kg X 0.40m = 80J
When can you say that work is done on an object?
when a force acts to move an object,we say that work was done on the object
What describes why work is done when you lift A book?
Work is being done when you lift an object because you are applying a force (lifting) parallel to and against another force (gravity). If you carry an object, you are still applying a force directed upwards, however your motion is perpendicular to gravity (as you walk to the east, for example). In this case, NO work is done, regardless of how far or how long you walk/carry. When you set the object down, again, your force is parallel to and with gravity. Therefore, work is done, however, in this case, it'll be negative.
How can work be done?
Work done when force moves an object.
When is work not done on an object?
Work = Force x Distance. so no work is done if there is no force exerted, or if the object does not move.
Give examples of the first law of thermodynamics in which no work is done on the system?
Work can be calculated as an integral of PdV, so if volume doesn't change (dV = 0) there is no work. Changing the temperature of an isochoric system involves no work on or by the system - unless you are moving the system around like lifting it or lowering it or shoving it or decellerating it.
How do we know if work is done?
In physics, work is done by a force acting on an object if the object moves in the direction of the force.
If a force of 100 newtons was exerted on an object and no work was done the object must have?
The object must be stationary. Work done happens when the object is moving in the direction of the force- if it is staying still, there is no work done!
