Physics 115 Test 2 with answers - PHYS115 Fall 2012 1/8...

PHYS115
g = 9.8 m
1 inch = 2
1 pound
1 pound ‐
ANSWE
600 lbf
inch

Question
of 1 kilog
What pow
a. 2
b. 1
c.
0
d. 8
ANSWE
Potential
pot
E m  
This hap
1 day 1 
Power =
5 - Fall 2012
m/s
2
25.4 mm
= 1 lb = 0.45
force = 1 lb
Qu
600
Wh
R:
600 0.454
inch

n 2 – The we
gram. It drop
wer does the
6
23 10 W


3
1.3 10 W


0 W
3
82 10 W


R:
l energy tran
(change g  
pens over th
1 day
24 h

1 d
work 1
time 86.4

4 kg
f = 1 lb × g
uestion 1 – T
0 lbf/in.
hat is its spr
a. 231 N/m
b. 10,700
c. 105,000
d. since it
g 
1 in

25.4 1 
eight in the a
ps 20 cm per
e gravitation
nsferred to cl
in height) 
he course of
hour
day
3600
hou

3
1.96 J
23
4 10 s


The spring in
ring constant
m
N/m
0 N/m
t is not exten
nch
3
105,
10 m 

adjacent wei
r day.
nal force exe
lock (= work
1 9.8 0.2   
1 day which
secs.
ur
86,40 
6
3 10 J/s 2

 
1 / 8
n the adjacen
t?
nded or comp
,000 N/m 1 
ight ‐ driven c
ert on the clo
k done on clo
1.96 joules
h is
00 secs.
6
23 10 W


nt car shock
pressed, the
105 kN/m
clock has a m
ock?
ock) is
s
Test 2 - N
absorber ha
e spring cons
mass
November 28,
as a stiffness
stant is zero
1 kg
20 c
per
2012
s of
g
cm
day

PHYS115
Question
ANSWE
Angular
(unit of r
Question
How mu
cane air h
a. 1
b. 1
c. 1
d. 1
ANSWE
Kinetic e
Going fro
100 times
ANSWE
See book
5 - Fall 2012
n 3 – What is
N ∙ m
2
/s
kg ∙ m
2
/s
kg ∙ m/s
N ∙ m
R:
momentum
rotational m
n 4 – The air
uch more/les
have than 1
10 times mor
100 times mo
10 times less
100 times les
R:
nergy is 1
2

om speed 20
s bigger. Kin
R:
k, figure at bo
s the SI unit
m is (rotation
ass) (unit o 
r in a hurrica
s kinetic ene
kg of air mo
re
ore
ss
mass speed 
0 km/h to spe
netic energy
ottom of pag
of angular m
nal mass) (a 
of angular sp
ane travels a
ergy does 1 k
oving at only
2
1
2
d mass  
eed 200 km/
involves (sp
Questio
coefficie
ge 103
2 / 8
momentum?
angular spee
peed) kg m  
t 200 km/h.
kg of this hu
y 20 km/h?
2
s speed  
/h the speed
peed x speed
on 5 – Which
ent of restitu
the speed of
cannot tell b
the baseball
the golf ball
?
d) , so it has
2
1
m kg m
s
  
urri ‐
1
2
mass sp  
gets 10x big
d) which the
h of the two
ution?
f the balls mu
ecause both
Test 2 - N
s the unit
2 m / s .
peed speed 
gger, so (spe
en gets 100x
balls has a g
ust be know
balls start fr
November 28,
.
eed x speed)
bigger.
greater
wn
rom a 1 m he
2012
gets
eight

PHYS115
Question
How fast
ANSWE
Argue as
Collision
110 km/h
Question
particula
The angu
a. …
b. …
c. …
d. …
ANSWE
Angular
(rotation
angular s
so does t
5 - Fall 2012
n 6 – The bas
t is the baseb
80 km/h
230 km/h
120 km/h
210 km/h
R:
s in book pag
n speed is 12
h. Add bat sp
n 7 – Spinnin
ar satellite de
ular moment
… 25 times sm
… 5 times sm
… 5 times lar
… unchanged
R:
momentum
nal mass) (a 
speed gets 5
he angular m
120 km
80 km/h
seball’s coef
ball after the
ge 106/107.