Answers to Chapter Ten Questions
1)
After 1 second it is going 32 ft/s
After 2 seconds it is going 64
ft/s
After 3 seconds it is going 96
ft/s
After 4 seconds it is going 128
ft/s
After 5 seconds it is going 160
ft/s
2)
Zero acceleration, you are not going anyplace!
3)
Zero net force, no acceleration means
there is no net force.
4)
The scale in the rocket reads Chuck’s
weight.
5)
The scale is pushing up on Chuck
causing him to accelerate at 32 ft/s2, the force required to cause
that much acceleration is Chuck’s mass times 32 ft/s2, which is the
same as his weight. Thus the scale in
the accelerating rocket reads exactly the same value as it did for the
stationary rocket on Earth.
6)
The coasting rocket has zero
acceleration. So Chuck has no
acceleration which means the scale is no longer pushing up on Chuck. The scale reads zero.
7)
24 hours times 60 minutes in each hour
times 60 seconds in each minute = 86400 seconds.
8)
Speed = 32 ft/s2 times
86400 seconds = 2,764,800 ft/s = 1,885,091 mph!
9)
Speed/Velocity of Light = 0.0027648,
less than 0.3 % of the speed of light!
10)
|
TRocket |
TEarth |
XEarth |
VStart |
VEnd |
VAverage |
ΔTEarth |
ΔXEarth |
|
0 |
0 |
0 |
0 |
0.00276 |
0.00138 |
1 |
0.00138 |
|
1 |
1 |
0.00138 |
0.00276 |
0.00552 |
0.00414 |
1.000004 |
0.00414 |
|
2 |
2.000004 |
0.00552 |
0.00552 |
0.00828 |
0.0069 |
1.000015 |
0.0069 |
11) 4,290,958 days have passed on Earth which is 11,756 years!
12) 4,290,596 light-days from Earth which is 11,755 light-years!
13) The
rocket reaches a distance of 23,510 light-years from Earth before beginning its
trip back home. That is about ¼ the
diameter of the Milky Way and only about 1 % of the distance to the Andromeda
Galaxy, our nearest neighbor major galaxy!
14) 23,512
years have passed on Earth while the rocket traveled for 40 years!
15) This
for you to do if you have not yet done it!
16) Rockets
move by pushing stuff out one end causing the rocket to move in the opposite
direction to conserve momentum.
17) 3
x 1022 kilograms!!
18) As
described in the chapter, a shell of thickness 6.7 miles would have to be
scraped off the surface of the Earth in order for a rocket to have enough fuel
to accelerate at 32 ft/s2 for 40 years.