- #1
Paymemoney
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Hi
I have a few question i don't understand how to complete.
A model rocket leaves the ground, heading straight up at 49m/s.
a)What is the maximum altitude?What are its speed and altitude at b)1s c)4s
2. Homework Equations ( For all questions)
Constant acceleration formulas
Average speed equation
Question a) i understand how to complete, however how would i solve b)
This is what i have tried:
t=1s
v-final=?
v-initial=0
a=9.80
used the v-final=v-initial + at
v-final = 9.8m/s
this is incorrect what have i done wrong?
A jetliner leaves San Francisco for New York, 4600km away. With a strong tailwind, its speed is 110km/h. At the same time, a second jet leaves New York for San Francisco. Flying into the wind, it makes only 700km/h. When and where do the two planes pass each other?
Well firstly i tried to find the time from NY to SF and NY to SF.
So i get 4.18hrs and 6.57hrs. I minus the figures to get the time that the two planes pass which is 2.37hrs. However according to the book's answer this is incorrect.
For the distance i went 400(1100-700) * 2.39 = 956km.
A hockey puck moving at 32m/s slams through a wall of snow 35cm thick. It emerges moving at 18m/s. a) How much time does it spend in the snow? b) How thick a wall of snow would be needed to stop the puck entirely.
i found question a) was t=0.014s, but could not find the correct answer to question b)
I have tried doing the following:
[tex]x= \frac{v-initial - v-final}{2} * t[/tex]
[tex]x=\frac{32}{2} * 0.014[/tex]
x=0.224m
P.S
I have a few question i don't understand how to complete.
Homework Statement
A model rocket leaves the ground, heading straight up at 49m/s.
a)What is the maximum altitude?What are its speed and altitude at b)1s c)4s
2. Homework Equations ( For all questions)
Constant acceleration formulas
Average speed equation
The Attempt at a Solution
Question a) i understand how to complete, however how would i solve b)
This is what i have tried:
t=1s
v-final=?
v-initial=0
a=9.80
used the v-final=v-initial + at
v-final = 9.8m/s
this is incorrect what have i done wrong?
Homework Statement
A jetliner leaves San Francisco for New York, 4600km away. With a strong tailwind, its speed is 110km/h. At the same time, a second jet leaves New York for San Francisco. Flying into the wind, it makes only 700km/h. When and where do the two planes pass each other?
The Attempt at a Solution
Well firstly i tried to find the time from NY to SF and NY to SF.
So i get 4.18hrs and 6.57hrs. I minus the figures to get the time that the two planes pass which is 2.37hrs. However according to the book's answer this is incorrect.
For the distance i went 400(1100-700) * 2.39 = 956km.
Homework Statement
A hockey puck moving at 32m/s slams through a wall of snow 35cm thick. It emerges moving at 18m/s. a) How much time does it spend in the snow? b) How thick a wall of snow would be needed to stop the puck entirely.
The Attempt at a Solution
i found question a) was t=0.014s, but could not find the correct answer to question b)
I have tried doing the following:
[tex]x= \frac{v-initial - v-final}{2} * t[/tex]
[tex]x=\frac{32}{2} * 0.014[/tex]
x=0.224m
P.S