- #31
proculation
- 71
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actually, the "d" should have been "-2", so the it should have been:
-2/-4.905=t*t
2/4.905=t²
-2/-4.905=t*t
2/4.905=t²
Conceptual Physics: Solving Problems in Math & Science
- Thread starter Dsoto489
- Start date
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Homework Help Overview
The discussion revolves around conceptual physics problems, particularly focusing on motion, acceleration, and the effects of gravity. The original poster expresses difficulty with fundamental concepts after a long absence from math and science, seeking logical steps rather than direct answers.
Discussion Character
- Exploratory, Conceptual clarification, Problem interpretation, Assumption checking
Approaches and Questions Raised
- Participants discuss various physics problems involving acceleration, horizontal and vertical motion, and the influence of gravity. There are attempts to clarify the relationships between velocity and acceleration, as well as the separation of horizontal and vertical components in projectile motion. Questions arise about the correct application of formulas and the assumptions that can be made about initial conditions.
Discussion Status
Participants are actively engaging with the problems, providing hints and guidance without giving direct solutions. There is a recognition of the need to separate horizontal and vertical motion in the analysis. Some participants express confusion about the application of formulas and the interpretation of variables, indicating an ongoing exploration of the concepts involved.
Contextual Notes
The original poster mentions a specific set of problems, indicating a larger set of 20 questions. There is a noted discomfort with rounding values and assumptions about initial velocities, as well as a struggle with understanding the implications of gravity on motion.
- #32
Dsoto489
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is the d (-) because it is falling?
- #33
proculation
- 71
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Because you are starting from the shelf (y=0) to the ground (y=-2) and you use Vf-Vo for the difference.
- #34
proculation
- 71
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So now you have "t", put it in your X equation to get the distance from the edge of the shelf where it falls. And Voila !
- #35
proculation
- 71
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Physics is not that difficult you see :-)
- #36
proculation
- 71
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be back in 10 minutes, corner store time for some beers.
- #37
Dsoto489
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ok, now i have
X
a=0
Vo=8m/s
V=8m/s
d=?
t=.64s
y
a=9.81
Vo=0
V=6.26
d=2m
t=.64s
X
a=0
Vo=8m/s
V=8m/s
d=?
t=.64s
y
a=9.81
Vo=0
V=6.26
d=2m
t=.64s
- #38
Dsoto489
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I keep trying to plug the equation only to cancel out most of the numbers and get D=T
When and if you get back on here, could you just run me through the steps when approached with these types of problems? maybe give me another example I could run through? I really appreciate the help here-
When and if you get back on here, could you just run me through the steps when approached with these types of problems? maybe give me another example I could run through? I really appreciate the help here-
- #39
proculation
- 71
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d=Vo(or Vf it's the same) X t
remember, distance = velocity X time
remember, distance = velocity X time
- #40
Dsoto489
- 43
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ok so my D=5.1 m/s/s
- #41
proculation
- 71
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You run a car at 100 mph for 2 hours. How much distance will you travel ?
d = 100 x 2 = 200 miles
d = 100 x 2 = 200 miles
- #42
Dsoto489
- 43
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agreed, i understand the d=v/t formula, its the bigger one, that deals with this entire problem that i keep tripping on.
- #43
proculation
- 71
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d = 8 m/s X 0.64s
meters/seconds X seconds
seconds/seconds = nil
only meters stay in unit.
meters/seconds X seconds
seconds/seconds = nil
only meters stay in unit.
- #44
Dsoto489
- 43
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yea, after i reread the problem i saw that i kept the s. So 5.1m is the distance the ball will end up at when i reaches the floor.
- #45
proculation
- 71
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Was it so difficult ? :-)
- #46
Dsoto489
- 43
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totally! ahah, ok so i have a similar problem which has the same horiz velocity of 8m/s but instead height of the table they give me time(.24s). Do i work the problem the same way?
- #47
Dsoto489
- 43
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or can i just use the D=v/t
- #48
proculation
- 71
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I think you have all the information you need.
Switch the variable in Y and resolve with the X equation like you did.
Switch the variable in Y and resolve with the X equation like you did.
- #49
Dsoto489
- 43
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d=8(.24)+1/2(o)(.24*.24)
- #50
Dsoto489
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so the height of the table is 1.92m tall
- #51
proculation
- 71
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Hummm.. as I reread your question, it would be it be if I was the teacher I would ask for the height of the table.
- #52
Dsoto489
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yea the problem is looking for the height of the shelf/table
- #53
proculation
- 71
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you again mixed the X and Y.
1.92m is where the ball will hit the ground from the shelf, horizontally.
1.92m is where the ball will hit the ground from the shelf, horizontally.
- #54
Dsoto489
- 43
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ok so the variables i have are
Vo=8m/s
a=0
t=.24s
d=1.92m
a=9.81m/s/s
Vo=8m/s
a=0
t=.24s
d=1.92m
a=9.81m/s/s
- #55
proculation
- 71
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Gimme some minutes, I will draw something.
- #56
Dsoto489
- 43
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I won't be leaving anytime soon, so take all the time you need. lol thanks.
- #57
- #58
proculation
- 71
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See the big black line between X and Y ? That's on purpose. They are to be resolved SEPARATELY.
- #59
Dsoto489
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k, i ll try out the problem, give me a sec or 2
- #60
proculation
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oops there's a error. it's "a = Vf X t² + Vo"
Sorry.
I was trying to make a good drawing lol
Sorry.
I was trying to make a good drawing lol