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Fall 2007
General Physics I: Class Exam 2
16 November 2007
Name:
Total:
/50
Instructions
•
There are 7 questions on 5 pages.
•
Show your reasoning and calculations and always justify your answers.
Physical constants and useful formulae
g
= 9
.
81m/s
R
= 8
.
314J/mol K
N
A
= 6
.
02
×
10
−
23
/mol
k
B
= 1
.
38
×
10
−
23
J/K
P
atmos
= 1
.
01
×
10
5
Pa
T
C
=
T
+273
.
15
T
F
=
9
5
T
C
+32
Moment of inertia: solid disk
I
=
1
2
mr
2
Moment of inertia: hoop
I
=
mr
2
ρ
water
= 1
.
0
×
10
3
kg/m
3
Question 1
A ball attached to a string initially swings in a hor
izontal circle with a constant angular speed. The
string is adjusted in such a way that the ball swings
with a faster constant angular speed without chang
ing the tension in string. Which of the following must
be true?
a) The length of the string was not changed.
b) The string was shortened.
c) The string was lengthened.
d) It is impossible to get the ball to swing at a faster angular speed without changing the
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This note was uploaded on 06/21/2011 for the course MATHEMATIC 135 taught by Professor Phystago during the Spring '11 term at Waterloo.
 Spring '11
 Phystago
 Math

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