A 1.00 kg glider attached to a spring with a force constant 25.0 N/m oscillates on a horizontal, frictionless air track. At t = 0, the glider is released from rest at x = -2.70 cm. (That is, the spring is compressed by 2.70 cm.)
(a) Find the period of its motion.
s
(b) Find the maximum values of its speed and acceleration.
m/s
m/s2
(c) Find the position, velocity, and acceleration as functions of
time (t).
x(t) =
cm (position)
v(t) =
cm/s (velocity)
a(t) =
cm/s2 (acceleration)
(a)
w = sqrt(k/m) = sqrt(25/1) = 5 rad/s
T = 2pi*sqrt(m/k)
T = 2pi*sqrt(1/25)
T = 1.257 sec
(b)
amplitude, Xm = 2.70 cm = 0.027 m
Vmax = w*Xm = 5 rad./s x 0.027 m = 0.135 m/s or 13.5 cm/s
amax = w^2 x Xm = 25 x 0.027 = 0.675 m/s^2 or 67.5 cm/s
(c)
X(t) = Xm*cos(wt + )
X(t) = -2.70*cos(5t)
v(t) = 13.5*sin(5t)
a(t) = 67.5*cos(5t)
(c)
x = - 2.50 cos[ 6t ] cm.
x' = 2.50 (6)sin[ 6t ] cm/sec.
x'' = 90.00 cos[6 t ] cm/sec^2.
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