- #1
Ishfa
- 3
- 0
- Homework Statement
- Classical Mechanics
- Relevant Equations
- s= v0t + 1/2 gt^2
What Determines the Minimum Mass of a Block in a Collision Scenario?
- Thread starter Ishfa
- Start date
AI Thread Summary
The discussion centers on determining the minimum mass of a block in a collision scenario involving two cans. Participants emphasize the importance of clearly explaining the process and providing sketches to illustrate height versus time. Key points include deriving expressions for the velocities of both cans over time and understanding their relationship at the moment of collision. The conversation also highlights the need to focus on eliminating the correct variables to solve for time rather than velocity. The minimum mass is linked to ensuring a specific time of flight after the collision when the masses combine.
- #2
BvU
Science Advisor
Homework Helper
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Hi,
See rules etc: explain (in words) what you are doing; make a sketch (Height versus time) of what happens.
We are a bit reluctant to reverse engineer your writings, so you have to help us help you
##\ ##
See rules etc: explain (in words) what you are doing; make a sketch (Height versus time) of what happens.
We are a bit reluctant to reverse engineer your writings, so you have to help us help you
##\ ##
- #3
- 15,825
- 8,983
The collision time happens once and cannot be double-valued.
You can make your life simpler and avoid quadratics if you consider the velocities.
1. Write expressions for the velocity of each can as a function of time.
2. How is the velocity of the first can v1 related to the velocity of the second can v2 at the time of the collision?
- #4
- 42,705
- 10,459
In your fifth equation, the one ending …16-1)=0, check where that -1 comes from. It should be something else.
Also, having obtained a quadratic in t that involves the unknown ##v_0##, bear in mind that what you want to find is t, not ##v_0##. So which should you be trying to eliminate?
Btw, what has this to do with "minimum mass of a block"?
Also, having obtained a quadratic in t that involves the unknown ##v_0##, bear in mind that what you want to find is t, not ##v_0##. So which should you be trying to eliminate?
Btw, what has this to do with "minimum mass of a block"?
Last edited:
- #5
- 15,825
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The minimum mass may have something with another part of the problem, e.g (b) Find the minimum value of the second mass so that the time of flight after the collision is ##t_2## seconds if the masses stick together (or some such thing.)haruspex said:
Kindly see the attached pdf. My attempt to solve it, is in it.
I'm wondering if my solution is right. My idea is this: At any point of time, the ball may be assumed to be at an incline which is at an angle of θ(kindly see both the pics in the pdf file). The value of θ will continuously change and so will the value of friction.
I'm not able to figure out, why my solution is wrong, if it is wrong .
TL;DR Summary: I would like to know the voltmeter readings on the two resistors separately in the picture in the following cases , When one of the keys is closed When both of them are opened (Knowing that the battery has negligible internal resistance)
My thoughts for the first case , one of them must be 12 volt while the other is 0
The second case we'll I think both voltmeter readings should be 12 volt since they are both parallel to the battery and they involve the key within what the...
My initial calculation was to subtract V1 from V2 to show that from the perspective of the second aircraft the first one is -300km/h.
So i checked with ChatGPT and it said I cant just subtract them because I have an angle between them. So I dont understand the reasoning of it. Like why should a velocity be dependent on an angle? I was thinking about how it would look like if the planes where parallel to each other, and then how it look like if one is turning away and I dont see it. Since...
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