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intriqet
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I have two problems. I have filled in most of the information that is asked but I can't seem to figure out a part for each problem. Please Help.
Problem 1:
At a NASA research center free-fall research is performed by dropping experiment packages from the top of an evacuated shaft 146 m high. Free-fall imitates the so called microgravity environment of a satellite in orbit.
a) what is the max time interval for free fall if an experiment package were to fall the entire 146 m?
5.45 s [correct]
b) Actual NASA specs allow for a 5.24 s drop interval. How far do the packages in 5.24 s?
135m [correct]
c) What is their speed at 5.24 s?
51.5 m/s [correct]
d) What constant acceleration would be required to stop an experiment package in the distance remaining in the that shaft after its 5.24 fall?
121 m/s^2 [incorrect]
Kinematic equations
Presumably, since the shaft is 146 m tall and the package has already fallen 135 m there are 11 m left for the package to stop.
deltaX = 11 m : Vi = 51.5 m/s : Vf = 0 m/s
this information should be enough to calculate Ax for the second part of the problem but Webassign says my answer is wrong. Any ideas guys?
Problem 2
An inquisitive physics student and mountain climber climbs a 48.0 m cliff that overhangs a calm pool of water. He throws two stones verticall downwar, 1.00 s apart and observes that they cause a single splash. The first stone has an initial speed of 1.92 m/s downward. Assume the downward direction is positive.
(a) How long after release of the first stone do the two stones hit the water?
2.93 s [correct]
(b) What initial velocity must the second stone have if they are to hit simultaneously?
16.1 m/s [incorrect]
(c) What is the speed of each stone at the instant the two hit the water?
first stone
30.7 m/s [correct]
second stone
34.62 m/s [correct]
Kinematic equations
This seems like a pretty straightforward problem but I can't seem to get question B right even though I used the value for question B to get the correct answer for question D.
Problem 1:
Homework Statement
At a NASA research center free-fall research is performed by dropping experiment packages from the top of an evacuated shaft 146 m high. Free-fall imitates the so called microgravity environment of a satellite in orbit.
a) what is the max time interval for free fall if an experiment package were to fall the entire 146 m?
5.45 s [correct]
b) Actual NASA specs allow for a 5.24 s drop interval. How far do the packages in 5.24 s?
135m [correct]
c) What is their speed at 5.24 s?
51.5 m/s [correct]
d) What constant acceleration would be required to stop an experiment package in the distance remaining in the that shaft after its 5.24 fall?
121 m/s^2 [incorrect]
Homework Equations
Kinematic equations
The Attempt at a Solution
Presumably, since the shaft is 146 m tall and the package has already fallen 135 m there are 11 m left for the package to stop.
deltaX = 11 m : Vi = 51.5 m/s : Vf = 0 m/s
this information should be enough to calculate Ax for the second part of the problem but Webassign says my answer is wrong. Any ideas guys?
Problem 2
Homework Statement
An inquisitive physics student and mountain climber climbs a 48.0 m cliff that overhangs a calm pool of water. He throws two stones verticall downwar, 1.00 s apart and observes that they cause a single splash. The first stone has an initial speed of 1.92 m/s downward. Assume the downward direction is positive.
(a) How long after release of the first stone do the two stones hit the water?
2.93 s [correct]
(b) What initial velocity must the second stone have if they are to hit simultaneously?
16.1 m/s [incorrect]
(c) What is the speed of each stone at the instant the two hit the water?
first stone
30.7 m/s [correct]
second stone
34.62 m/s [correct]
Homework Equations
Kinematic equations
The Attempt at a Solution
This seems like a pretty straightforward problem but I can't seem to get question B right even though I used the value for question B to get the correct answer for question D.
