Find the incorrect relation from the figure

AI Thread Summary
The discussion revolves around a confusion regarding the correctness of vector relationships in a problem. The user derived the equation C vector - D vector = -A vector but was informed it was incorrect. Others suggest that the question might contain a typo, indicating it should ask for the correct option instead. There is a consensus that only one answer, labeled as (i), appears to be correct based on the vector directions drawn. The issue may stem from the format of the test, which could have incorrectly coded answers.
Dhaneshragu
Messages
1
Reaction score
0
Homework Statement
Find the incorrect relation from the figure given below. ( figure given down)
Relevant Equations
Vector sum.
I tried making B vector in direction of D vector with a minus sign and after doing so I got the answer C vector - D vector= -A vector. But it's given as incorrect. I don't know why. Please explain how other options are correct.
15547802048611743369482713455288.jpg
 
Last edited by a moderator:
Physics news on Phys.org
Dhaneshragu said:
I tried making B vector in direction of D vector with a minus sign and after doing so I got the answer C vector - D vector= -A vector. But it's given as incorrect. I don't know why. Please explain how other options View attachment 241554are correct.
Looks to me like a typo in the question. It should be asking for the correct option, and as you found that is (i).
 
Based on the way you drew the arrows, I concur with you that only answer (i) is correct. Is this a computerized test/homework where you are selecting multiple choice? So you were supposed to select the incorrect ones...is that what you did? I have seen these computerized tests coded wit the wrong answer before.
 
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 came across this question from a Sri Lankan A-level textbook. Question - An ice cube with a length of 10 cm is immersed in water at 0 °C. An observer observes the ice cube from the water, and it seems to be 7.75 cm long. If the refractive index of water is 4/3, find the height of the ice cube immersed in the water. I could not understand how the apparent height of the ice cube in the water depends on the height of the ice cube immersed in the water. Does anyone have an...
Back
Top