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Physics: Post your doubts here!

nehaoscar

nehaoscar

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ahmedish said:
Q3 as well??
Click to expand...
First the question says "the pointer does not return fully to zero"
This means that when the current is zero (true value) the scale doesn't show zero.
This tells us that at a true value of 0A, the reading is shown to be more than 0A so it has a + y-intercept
So this means the correct answer is between C and D
Now it also says "meter has become less sensitive at higher currents than it is at lower currents"
less sensetive means that the scale reading would not change as drastically as it did for the lower currents
So the gradient decreases
Therefore the answer is C
 
asadalam

asadalam

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Physicist said:
go to
http://physics-ref.blogspot.com/2014/06/9702-june-2012-paper-12-worked.html
Click to expand...
Dark Destination F.Z.M. 7 The Sarcastic Retard
Mind helping me out on these 2 questions?Im asking for the seconds ans and whether i did the first right?:


1. A rotating space station has radius 1380 m, measured from the center of rotation to the outer deck where the crew lives. What should the period of rotation be if the crew is to feel they weigh one-half of their Earth weight?

g/2=rw^2

w=0.0843=2pi/T

T=2pi/0.0843

T=74.5 s



2. How far would a tennis ball (100g) go if thrown from your catapult at a height of 1 meter, with a force of 50N and at an angle of 50 degrees from the horizontal?
 
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