1.
According to Newtons second law, the acceleration is a = SF/m. Since the pilot and the
plane have the same acceleration, we can write
S
S
F
F
=
m
PILOT m
PLANE
SF
m
PLANE
( SF ) PILOT =mPILOT
or
Therefore, we find
104 N
3.7
=
93 N
4
3.1
1
3. According to Equation 3.2, we have
a
v v0
t t0
or
340 m / s 2
v 0 m/s
0.050 s
or
c
v 340 m / s 2
0.050
b
h sg
Using trigonometry, we find the components to be
0.050
b cos
c
h sg 51 11 m / s
v sin 51 c m / s h
340
0.050 sin
b sg 51 13 m / s
v x v cos 5
1.
The distance traveled by the Space Shuttle is equal to its speed multiplied by the
time. The number of football fields is equal to this distance divided by the length L
of one football field.
The number of football fields is
(
)(
)
7.6 103 m / s 110 10
2.
a. To convert the speed from miles per hour (mi/h) to kilometers per hour (km/h), we
need to convert miles to kilometers. This conversion is achieved by using the
relation 1.609 km = 1 mi
b. To convert the speed from miles per hour (mi/h) to meters per
Chun Tan
PH 106 TR - 11:00am-11:50am
Jian Peng
March 12,2013
1. What is the topic of your research paper? Why do you choose this topic?
Topic: elevator
The reason I chose this topic is that elevator is a big physical device we use in
our daily time. Its a