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A pendulum moves in simple harmonic motion. If a graph of the pendulum's motion is drawn with respect with respect to time, the graph will be a sine wave. Pure tones are experienced when the eardrum moves in simple harmonic motion. In these cases "wave" refers not to the thing moving, but to the graph representing the movement.
If the instant is finite, the object is in the position indicated on the graph
The motion of a pendulum in water will be similar to what it is in air, except it will move more slowly and loose energy much more rapidly (unless something with some "power" is keeping it going). The speed of the pendulum should graph like a sine wave with the peaks and troughs denoting the endpoints of the travel of the pendulum in its arc. The slope of the curve at any point will represent the instantaneous acceleration. If the pendulum is released and no energy is put in from outside, the graph of the speed will diminish very quickly and dramatically.
The instantaneous speed is the gradient of the graph at that particular point.
It's difficult to make out enough detail to formulate an answer. Not only can't I see the numbers below the graph, I can't even see the graph.
To illustrate the graph of a simple pendulum, you can plot the displacement (angle) of the pendulum on the x-axis and the corresponding period of oscillation on the y-axis. As the pendulum swings back and forth, you can record the angle and time taken for each oscillation to create the graph. The resulting graph will show the relationship between displacement and period for the simple pendulum.
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A pendulum moves in simple harmonic motion. If a graph of the pendulum's motion is drawn with respect with respect to time, the graph will be a sine wave. Pure tones are experienced when the eardrum moves in simple harmonic motion. In these cases "wave" refers not to the thing moving, but to the graph representing the movement.
The period vs length graph of a pendulum is a straight line because the period of a pendulum is directly proportional to the square root of its length, as derived from the formula for the period T = 2π√(L/g). This relationship results in a linear graph when plotted.
If the instant is finite, the object is in the position indicated on the graph
time and angle. this will show a sinusoidal graph of presumably deteriorating magnitude.
With a graph you get an almost instant visual image of the data presented.
The slope at each point of a displacement/time graph is the speed at that instant of time. (Not velocity.)
The motion of a pendulum in water will be similar to what it is in air, except it will move more slowly and loose energy much more rapidly (unless something with some "power" is keeping it going). The speed of the pendulum should graph like a sine wave with the peaks and troughs denoting the endpoints of the travel of the pendulum in its arc. The slope of the curve at any point will represent the instantaneous acceleration. If the pendulum is released and no energy is put in from outside, the graph of the speed will diminish very quickly and dramatically.
The instantaneous speed is the gradient of the graph at that particular point.
A pendulum can trace out a sinusoidal curve by swinging back and forth under the influence of gravity. As the pendulum swings, it undergoes simple harmonic motion with a sinusoidal pattern, where the displacement of the pendulum from its resting position follows a sine wave. By recording the position of the pendulum at different points in time, you can create a graph that shows a sinusoidal curve.
It's difficult to make out enough detail to formulate an answer. Not only can't I see the numbers below the graph, I can't even see the graph.