In Q4 part b by your equation answer is 4.5 *10"4 but you directly wrote the marking scheme answer and in marking scheme there is a different solution so can you please tell how to solve it
You can take upward as positive and downward as negative and vice versa. here she has take upward as positive and downward as negative. So acceleration is downward it means it's -9.81 and final velocity after collision with ceiling is also downward so -3.8 and initial velocity before collision is upward so taken +9.6 You can swith signs if you are taking upward as negative but answers will be same. Hope you have got the point.
@@faizan2647 but isn't the force exerted on ball by the ceiling downwards? She has taken downwards as negative, So if acceleration is downwards shouldnt it be negative too
@@amnawasti2012 The change in momentum we got in (e) part is +0.55 and dividing it by time of collision we got force exerted on ball which is Downward as +6.47. Here it means that downward force is positive.
@@amnawasti2012 I have already told you that taking upward as positive or downward as positive and vice versa won't change your answers. Here downward force as positive shows that actual question was taking downward as positive!
In Q1 part a if the air resistance is being neglected then why the final speed at the top is not 0? As during upward motion speed decreases at a constant rate when air resistance is neglected.
The speed with which the ball leaves the ceiling is not zero either and energy must be conserved hence final velocity will not be zero this time. They gave you the initial speed with which it leaves the ceiling so that you make use of that in order to find the final velocity with which it reached ceiling.
To answer this question, it is important to realize that a series of maxima and minima will be observed along the path of detector and not just at spot X. As the phase difference now changes to 180 degrees, this will produce maxima (from constructive interference) and minima (from destructive interference) switch spots.
Everytime there must be a tricky part to a question or a caching point, i like physics but i don't understand why it's like that, sometimes i get discouraged 😢
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at this point 19:30 how did you get the 3 mm directly? Btw thanks for the video, it helped me a bunch
In Q4 part b by your equation answer is 4.5 *10"4 but you directly wrote the marking scheme answer and in marking scheme there is a different solution so can you please tell how to solve it
She made a mistake, she’s supposed to multiply the denominator by 10^-3 to convert to meters
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In Q3 part f why didnt you take acceleration as negative?
You can take upward as positive and downward as negative and vice versa. here she has take upward as positive and downward as negative.
So acceleration is downward it means it's -9.81 and final velocity after collision with ceiling is also downward so -3.8 and initial velocity before collision is upward so taken +9.6
You can swith signs if you are taking upward as negative but answers will be same. Hope you have got the point.
@@faizan2647 but isn't the force exerted on ball by the ceiling downwards? She has taken downwards as negative,
So if acceleration is downwards shouldnt it be negative too
@@amnawasti2012 The change in momentum we got in (e) part is +0.55 and dividing it by time of collision we got force exerted on ball which is Downward as +6.47.
Here it means that downward force is positive.
@@amnawasti2012 I have already told you that taking upward as positive or downward as positive and vice versa won't change your answers. Here downward force as positive shows that actual question was taking downward as positive!
In Q1 part a if the air resistance is being neglected then why the final speed at the top is not 0? As during upward motion speed decreases at a constant rate when air resistance is neglected.
The speed with which the ball leaves the ceiling is not zero either and energy must be conserved hence final velocity will not be zero this time. They gave you the initial speed with which it leaves the ceiling so that you make use of that in order to find the final velocity with which it reached ceiling.
24:26 why is it not destructive interference?
To answer this question, it is important to realize that a series of maxima and minima will be observed along the path of detector and not just at spot X. As the phase difference now changes to 180 degrees, this will produce maxima (from constructive interference) and minima (from destructive interference) switch spots.
Why don't in q2 part 1 we use upthrust formula to find density?
Cause then you would get the density of water not the density of the sphere
Please help cannot get the right answer in dopplereffect question
The denominator shifts to left HS of equation and gets multiplied by 4870. Then subtract the V terms and divide 30681 by 20.
Everytime there must be a tricky part to a question or a caching point, i like physics but i don't understand why it's like that, sometimes i get discouraged 😢
It might seem difficult now, but practice makes perfect! Keep working on it and you will definitely see improvement👍
@@examhelpweb2090 thank you 😊
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