Knowledge Survey Questions
1. A string is used to whirl a stone of mass
0.5 kg around in a horizontal circle. The
stone is moving with a speed of 10 m/s,
and the radius of the circle is 0.5 m.
What is the tension in the string?
2. A string is used to whirl a stone of mass
0.5 kg around in a vertical circle. The
radius of the circle is 0.5 m. The stone is
moving with a speed of 10 m/s at the
BOTTOM of its path. What is the tension
in the string when the stone is at its
LOWEST point?
Final Exam Questions
1. A string is attached to a 0.040-kg air hockey
puck resting on an air hockey table, which is
level and has negligible friction. The string is
used to whirl the air hockey puck in a
horizontal circle with a radius of 0.25 m. The
puck moves with a constant speed of 5 m/s.
What is the tension in the string?
A. 0 N
B. 0.39 N
C. 3.61 N
D. 4 N
E. 4.39 N
2. The 0.040-kg air hockey puck is now
whirled in a vertical circle with a radius of
0.25 m. What is the tension in the string
when the puck is at the bottom of the circle
if the speed of the puck at that point is 5
m/s?
A. 0.39 N
B. 0.59 N
C. 3.61 N
D. 4 N
E. 4.39 N