- #1
Kdawg
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I have 5 problems on my homework that I can get right. Probably because of somthing stupid but I have to get these done soon. I don't need the answers, just some hints or tips. I have included my work or a description on all of them.
1.) A race car traveling at +44 m/s is uniformly accelerated to a velocity of +24 m/s over an 12-s interval. What is its displacement during this time?
Vi = 44m/s
Vf = 24m/s
t = 12
d = ?
a = Vf-Vi
----
t
a = -1.6
d = 1/2at^2
d = -115.2
with correct sig figs
120
2.) A car accelerates at a constant rate from 16 m/s to 23 m/s while it travels 130 m. How long does this motion take?
Vi = 16m/s
Vf = 23m/s
d = 130m
t = ?
Dont know what formula/s to use for this one.
3.) An airplane accelerates from a velocity of 22 m/s at the constant rate of 2.8 m/s2 over +504 m. What is its final velocity?
Vi = 22m/s
a = 2.8m/s^2
d = 504m
Vf = ?
t = sqr((2*504)/2.8)
t = 19
Vf = Vi + at
Vf = 75.2
With correct sig figs 75
4.) A person wearing a shoulder harness can survive a car crash if the acceleration is smaller than -300 m/s2. Assuming constant acceleration, how far must the front end of the car collapse if its crashes while going 93 km/h?
Vi = 93km/h
Vf = 0km/h
d = ?
What am I missing in this one?
5.) A woman falls 1.6 m to the floor. How fast is she going when she hits the floor?
Vi = 0m/s
a = 9.8m/s^2
d = 1.6m
t = .57s
Vf = ?
Vf = Vi +at
Vf = 5.6
1.) A race car traveling at +44 m/s is uniformly accelerated to a velocity of +24 m/s over an 12-s interval. What is its displacement during this time?
Vi = 44m/s
Vf = 24m/s
t = 12
d = ?
a = Vf-Vi
----
t
a = -1.6
d = 1/2at^2
d = -115.2
with correct sig figs
120
2.) A car accelerates at a constant rate from 16 m/s to 23 m/s while it travels 130 m. How long does this motion take?
Vi = 16m/s
Vf = 23m/s
d = 130m
t = ?
Dont know what formula/s to use for this one.
3.) An airplane accelerates from a velocity of 22 m/s at the constant rate of 2.8 m/s2 over +504 m. What is its final velocity?
Vi = 22m/s
a = 2.8m/s^2
d = 504m
Vf = ?
t = sqr((2*504)/2.8)
t = 19
Vf = Vi + at
Vf = 75.2
With correct sig figs 75
4.) A person wearing a shoulder harness can survive a car crash if the acceleration is smaller than -300 m/s2. Assuming constant acceleration, how far must the front end of the car collapse if its crashes while going 93 km/h?
Vi = 93km/h
Vf = 0km/h
d = ?
What am I missing in this one?
5.) A woman falls 1.6 m to the floor. How fast is she going when she hits the floor?
Vi = 0m/s
a = 9.8m/s^2
d = 1.6m
t = .57s
Vf = ?
Vf = Vi +at
Vf = 5.6