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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.
A sine-wave graph
the birthrate on earth is higher than the death rate. apex
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.
time and angle. this will show a sinusoidal graph of presumably deteriorating magnitude.
If the instant is finite, the object is in the position indicated on the graph
With a graph you get an almost instant visual image of the data presented.
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 slope of a speed/time graph at any point is the acceleration at that instant.
The slope at each point of a displacement/time graph is the speed at that instant of time. (Not velocity.)
The slope of that graph at each point is the speed at that instant of time.
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.