Physics, 27.06.2019 09:00 DrizzyN2899

To determine the trajectory of the movement of a material point in the xoz plane that is subjected simultaneously to oscillations x (t) = a * sin π(t + 1) and y (t) = a * sin (πt + π / 2).

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Answer from: shaferxspecial8397

We are to show that the given parametric curve is a circle.

The trajectory of a circle with a radius r will satisfy the following relationship:

(x-x_c)^2 + (y-y_c)^2 = r^2

(with (x_c,y_c) being the center point)

We are given the x and y in a parametric form which can be further rewritten (using properties of sin/cos):

$x(t) = A\sin \pi(t+1) = A\sin (\pi t + \pi) = -A\sin \pi t\\y(t) = A\sin (\pi t + \frac{\pi}{2}) = A\cos \pi t$

Squaring and adding both gives:

$x^2(t) + y^2(t) = A^2(-1)^2\sin^2 \pi t + A^2 \cos^2 \pi t = A^2\\\implies x^2 + y^2 = A^2$

The last expression shows that the given parametric curve is a circle with the center (0,0) and radius A.

Answer from: Quest

when the velocity of a mass on a spring is zero, the acceleration is at a maximum .

Answer from: Quest

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