homework 09 – GADHIA, TEJAS – Due: Mar 28 2007, 4:00 am
1
Question 1
part 1 of 3
10 points
A ball at the end of a string of length 1
.
7 m
rotates at a constant speed in a horizontal
circle. It makes 5
.
2 rev
/
s.
What is the period of the ball’s motion?
Answer in units of s.
Question 2
part 2 of 3
10 points
What is the frequency of the motion?
Answer in units of Hz.
Question 3
part 3 of 3
10 points
What is the ball’s angular velocity?
Answer in units of rad
/
s.
Question 4
part 1 of 1
10 points
A girl ties a toy airplane to the end of a
string and swings it around her head.
The
plane’s average angular speed is 2.5 rad/s.
In what time interval will the plane move
through an angular displacement of 3.4 rad?
Answer in units of s.
Question 5
part 1 of 2
10 points
A grinding wheel, initially at rest, is ro
tated with constant angular acceleration of
2
.
1 rad
/
s
2
for 9
.
04 s.
The wheel is then
brought to rest, with uniform deceleration, in
13
.
1 rev.
Find the magnitude of the angular deceler
ation required to bring the wheel to rest.
Answer in units of rad
/
s
2
.
Question 6
part 2 of 2
10 points
Determine the time needed to bring the
wheel to rest.
Answer in units of s.
Question 7
part 1 of 1
10 points
A wheel rotates with a constant angular
acceleration of 2
.
05 rad
/
s
2
. Suppose that at
t
0
= 0, the angular speed of the wheel is
2
.
83 rad
/
s.
What angle does the wheel rotate through
in 3
.
52 s?
Answer in units of rev.
Question 8
part 1 of 2
10 points
A dog sits 1.7 m from the center of a merry
goround.
a) If the dog undergoes a 1.5 m/s
2
cen
tripetal acceleration, what is the dog’s linear
speed?
Answer in units of m
/
s.
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 Spring '10
 Clerck
 Kinetic Energy, Moment Of Inertia

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