Gravitational potential energy is usually just written as
1 answer:
Gravitational potential energy is usually just written as GPE
Explanation:
The gravitational potential energy of an object is the energy possessed by the object due to its position in a gravitational field. It is usually indicated with GPE.
Near the Earth's surface, the GPE of an object is given by
where
m is the mass of the object
is the acceleration of gravity near the surface
h is the heigth of the object above the surface
We notice that the GPE is directly proportional to the heigth above the ground, h: therefore, when the object is lifted from the ground, its GPE increases, while when it is lowered towards the ground, its GPE decreases.
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Explanation:
In order to solve this problem we need to make a free body diagram of the book and the forces that interact on it. In the picture below you can see the free body diagram with these forces.
The person holding the book is compressing it with his hands, thus exerting a couple of forces of equal magnitude and opposite direction with value F.
Now the key to solving this problem is to analyze the equilibrium condition (Newton's third law) on the x & y axes.
To find the weight of the book we simply multiply the mass of the book by gravity.
W = m*g
W = 1.3[kg] * 9.81[m/s^2]
W = 12.75 [N]
