Physics, 03.03.2020 00:57 cxttiemsp021
A pendulum is made by letting a 4 kg mass swing at the end of a string that has a length of 1.5 meter. The maximum angle that the string makes with the vertical is 30 degrees (in both directions). What is the change in the potential energy of the mass as it moves from the lowest point to the highest point of its path?
Answers: 2
. 
. Its highest point is at 
. The length of segment 
gives the change in its height.
and 
are simply the length of the string, 
. To find the length of 
.
. Besides, it is adjacent to the 
angle 
. Its length would be:
.
.
. In this equation,
is the mass of the object, 
near the surface of the earth, and
is the change in the object's height.
and 
. Therefore:
.
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