The backpack has been lifted for 0.58 m
Explanation:
The work done in lifting an object is equal to the gain in gravitational potential energy of the object:
where
(mg) is the weight of the object, with
m being the mass
g being the acceleration due to gravity
is the change in height of the object
In this problem,
W = 110 J is the work done
mg = 190 N is the weight of the backpack
Solving for , we find the change in height of the backpack:
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Answer:
The weight is the same
3
lb
explanation
See explanation.
Explanation:
If by weight you mean the physical value measured in
l
b (or k
g
) usually called mass, then this value does not depend on a place where object is located. Object's mass would be the same everywhere even if you put it on Mars or the Sun.
The value which changes is the gravitational force. In your example it is
10
2
=
100 times greater on the Earth's surface than in the point 10 Earth's radii from its center.
Elastic energy is potential energy and mechanical energy is kinetic energy.
Many times, elastic energy is a consequence of mechanical energy. When energy is transferred to an object through mechanical energy, it can often displace or deform the object. This stored energy because of the deformation is called elastic energy.
Yes it is, cause someone could slip and accidentally stab themselves