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--- urp:physfreq [2021-11-08]
nerf_herder created
+++ urp:physfreq [2021-11-08]
nerf_herder
@@ Line 2: / Line 2: @@
 string, frequency, antinodes:
-Adjacent antinodes are separated by a distance of 20 cm and waves travel at a speed of 1200 cm/s along the string. What frequency is the string vibrating at?
 Ends of a stretched string are called nodes, N.
@@ Line 9: / Line 8: @@
 full sine wave (2N) = wavelength
-wavelength = 40 cm
+Example:
-  freq = v/wavelength, v = velocity of wave
+  Adjacent antinodes are separated by a distance of 20 cm and waves travel at a speed of 1200 cm/s along the string.
-/40 = 30
+  What frequency is the string vibrating at?
+    wavelength = 40 cm
+    freq = v/wavelength, v = velocity of wave
+/40 = 30
 **Doppler effect** => F = Fo (v +/- vo) / (v +/- vs)
@@ Line 19: / Line 21: @@
+====Spring and Lever====
+**Hooke's law** for springs: F=-kx, k=spring constant, x = displacement
+**Fulcrum**: t = r * f  (torque = radius * force)
+just add the torques for multiple objects on one side of a fulcrum
+====SHM - Simple Harmonic Motion====
+F = ma => ma = -kx
+angular frequency ω = √(k/m)
+period of oscillation T = 2π √(m/k)  (horizontal or vertical springs)
+In a vertical spring, the weight Mg of the body produces an initial elongation to equilibrium, such that Mg − kyₒ = 0.
+If y is the displacement from this equilibrium position the total restoring force will be Mg − k(yₒ + y) = −ky
+----------
+Back to the [[Physics]] page or the [[00_start|Start]] page.

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