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Physics: Post your doubts here!

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use Force = Change in momentum/time taken

this will give an answer of 0.5.
so select the answers which have a difference of 0.5
they r A and D
however as the ball hits the ground its momentum can never increase
it only decreases or stays the same (in elastic collisions) only
so there will be a decrease n answer will b D

hoping this helps
 
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use Force = Change in momentum/time taken

this will give an answer of 0.5.
so select the answers which have a difference of 0.5
they r A and D
however as the ball hits the ground its momentum can never increase
it only decreases or stays the same (in elastic collisions) only
so there will be a decrease n answer will b D

hoping this helps
Ans is C
 
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question 5.
each box is 0.2A. x coordinates and y coordinates are only equal at one point and that is 0.8A
question 14
take moments about the end of the truck. (this will just be trial and error)
A) cannot because clockwise moment does'nt equal anitclockwise moment.
only viable option is B where a force 15kn*20m=300 anticlockwise and clockwise is 30*10m=300k so they are both equal.
question 32.
good luck.......
 
Messages
36
Reaction score
19
Points
8
use Force = Change in momentum/time taken

this will give an answer of 0.5.
so select the answers which have a difference of 0.5
they r A and D
however as the ball hits the ground its momentum can never increase
it only decreases or stays the same (in elastic collisions) only
so there will be a decrease n answer will b D

hoping this helps
P2 in opposite direction so they get added up 0.3+0.2=0.5
 
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ohhhhhhhhhhhh i got it
its like the velocity is in the opposite direction now so that means it is 0.3- (-0.2)
that shows the momentum change in C is 0.5
n since momentum can only decreas answer is C

A and D r wrong cuz the difference is 0.65 - (-0.15)
this makes 0.70 not o.5
 
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You guys already go the answer but..oh well...
F= (p2- p1)/∆t
Since the ball is in opposite direction, it implies that
F= (p2+p1)/∆t

p2+p1 = 25* 0.02 = 0.5
Since the ball has the same mass the velocity before hitting the plate will be higher than the velocity after it bounces. So, therefore, p1 > p2, from the option C is the correct answer
 
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question 5.
each box is 0.2A. x coordinates and y coordinates are only equal at one point and that is 0.8A
question 14
take moments about the end of the truck. (this will just be trial and error)
A) cannot because clockwise moment does'nt equal anitclockwise moment.
only viable option is B where a force 15kn*20m=300 anticlockwise and clockwise is 30*10m=300k so they are both equal.
question 32.
good luck.......
The question asks us about mean power. key word mean. power=i^2*R we only have one value for R so we leave it alone. for current we have 2 distinct values 2A and -1A. so we take the avg value of I^2. SO watch this yea, its so cool. (2^2)+(-1^2)/2=2.5A^2 times that by 100ohms becuase of I^2*R to get 250Watts
 
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