Vijay's Reflex Time When Arvind Drops a Scale

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Homework Help Overview

The discussion revolves around a physics problem involving the reflex time of an individual, Vijay, who attempts to catch a scale dropped by another person, Arvind. The scale slips a distance of 20 cm during the event, and participants are exploring the implications of this scenario within the context of kinematics and constant acceleration.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • Participants discuss the relevance of kinematic equations and the acceleration due to gravity. There are inquiries about which equations might apply to the situation and how they relate to the given displacement and initial conditions.

Discussion Status

Several participants have offered guidance regarding the use of kinematic equations, particularly in relation to constant acceleration. There is an ongoing exploration of which specific equation would be most applicable to determine the reflex time, with some participants expressing uncertainty about their familiarity with the topic.

Contextual Notes

There are indications of confusion regarding the appropriate forum for posting questions, with participants acknowledging the need to use the homework forum for future inquiries. Additionally, some participants have noted their lack of familiarity with kinematics, which may affect their contributions to the discussion.

ritwik06
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arvind drops a scale vertically which is grabbed by Vijay whose hand is just below the scale. In the mean time the scale slips by 20cm. What is the reflex time of Vijay?
 
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Do you know any equations that may help you here? (hint: constant acceleration).

Is there a reason why this is in the tutorial forum? In future please post in the homework forum.
 
cristo said:
Do you know any equations that may help you here? (hint: constant acceleration).

Is there a reason why this is in the tutorial forum? In future please post in the homework forum.

yes, the acceleration will be 9.8 m/sec^2. But how will this help?

oh! I am sorry once again. I haven't understood till now, as to which question should I post in which section. I am sorry again.
 
ritwik06 said:
yes, the acceleration will be 9.8 m/sec^2. But how will this help?

Correct. Do you know any equations that will help you here? You are told the displacement, and you know that the initial velocity is zero.

oh! I am sorry once again. I haven't understood till now, as to which question should I post in which section. I am sorry again.

That's ok. I'm sure it'll be moved for you soon anyway! In future though, use the homework forum. It's the second forum in the list on the front page (just under the tutorial forum)
 
cristo said:
Correct. Do you know any equations that will help you here? You are told the displacement, and you know that the initial velocity is zero.



That's ok. I'm sure it'll be moved for you soon anyway! In future though, use the homework forum. It's the second forum in the list on the front page (just under the tutorial forum)

Nope which equation are you talking about?

Ok! I will use the homework section. Thanks!

sorry once again.
 
Have you come across the kinematic equations, for constant acceleration? Here's a link to them (scroll about half way down the page): http://www.glenbrook.k12.il.us/GBSSCI/PHYS/Class/1DKin/U1L6a.html . Which one do you think is most useful in this case?
 
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cristo said:
Have you come across the kinematic equations, for constant acceleration? Here's a link to them (scroll about half way down the page): http://www.glenbrook.k12.il.us/GBSSCI/PHYS/Class/1DKin/U1L6a.html . Which one do you think is most useful in this case?

will the 3rd one help? I have not studdied kinematics yet :S
 
Last edited by a moderator:
ritwik06 said:
will the 3rd one help? I have not studdied kinematics yet :S

Ok, well you should use the first equation:[tex]d=v_it+\frac{1}{2}at^2[/tex]. Here, note that vi=0, so this simplifies the equation somewhat. a is the acceleration due the gravity (9.81), d is the distance measured on the ruler, and t is the reaction time that you require.
 
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