The mass in the figure below slides on a frictionless surface.
When the mass is pulled out, spring 1 is stretched a distance
x1 from its equilibrium position and spring 2 is stretched a distance
x2. The spring constants are
k1 and
k2, respectively. The force pulling back on the mass is
a.
k2x1.
b.
k2x2.
c.
(
k1x1 +
k2x2).
d.
.
e.
.
Question 2A torsional pendulum consists of a solid disk (mass = 2.0 kg, radius = 1.0 m) suspended by a wire attached to a rigid support. The body oscillates about the support wire. If the torsion constant is 16 Nm/rad. What is the angular frequency (in rad/s)?
a.
2
b.
4
c.
6
d.
8
e.
7