abdullahAK
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#1
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#1
Hello , Everyone I have a question about Physics.I'll attach it in the box below.
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abdullahAK
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#2
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#2
student has 500 identical, rectangular sheets of paper. The mass of 1.0 m2of the paper is 0.080 kg.(a) Using a metre rule, she measures the length of one sheet of paper and its width. The length is 0.300 m and the width is 0.210 m.(i) Calculate the mass of one sheet of paper.
2)The student makes a single pile of the 500 sheets of paper.With a metre rule, she measures the height of the pile. The height of the pile is 0.048 m.Calculate the density of the paper.
(b) A second student has only 5 sheets of the same type of paper.
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username3249896
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#3
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#3
(Original post by abdullahAK)
student has 500 identical, rectangular sheets of paper. The mass of 1.0 m2of the paper is 0.080 kg.(a) Using a metre rule, she measures the length of one sheet of paper and its width. The length is 0.300 m and the width is 0.210 m.(i) Calculate the mass of one sheet of paper.
2)The student makes a single pile of the 500 sheets of paper.With a metre rule, she measures the height of the pile. The height of the pile is 0.048 m.Calculate the density of the paper.
(b) A second student has only 5 sheets of the same type of paper.
a) i)Given length and width, find the area of 1 sheet of paper. Find the mass of one sheet paper.

ii) Calculate the volume of 500 sheets of paper. Calculate the mass of 500 sheets of paper. Find the density.
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abdullahAK
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#4
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#4
OK,Thanks.
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abdullahAK
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#5
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#5
can't solve this question's .part b.
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username3249896
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#6
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#6
 P = h \rho g

The pressure due to the water at M is 60kPa
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abdullahAK
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#7
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#7
can you explain me part b beacuase I didn't understand it.
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username3249896
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#8
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#8
(Original post by abdullahAK)
can you explain me part b beacuase I didn't understand it.
The pressure at the point M is 60kPa above atmospheric pressure. You are to calculate the depth of M below the surface of the water.

 P_M = P_{atm}  + P_{water}
 P_{water} = \rho g h

 P_M = P_{atm} + 60 kPa = P_{atm} + P_{water}
 P_{water} = 60kPa
so pressure due to water is 60kPa at M. solve the equation
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abdullahAK
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#9
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#9
I have understood almost but I have last question?
We should add 60k into atmospheic pressure and then using the density equation we can work out th depth.What is the value of air pressure
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username3249896
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#10
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#10
(Original post by abdullahAK)
I have understood almost but I have last question?
We should add 60k into atmospheic pressure and then using the density equation we can work out th depth.What is the value of air pressure
You don't need it

It cancels out in the equation
air pressure + water pressure = 60kPa + air pressure
so air pressure cancels and you are left with
water pressure = 60kPa
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abdullahAK
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#11
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#11
Oh,Now I get it.
Thanks
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abdullahAK
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#12
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#12
I want to ask another question relating terminal velocity.
Q:When an object reaches terminal velocity,does it decelerate afterwards,when the terminal velocity phase finishes?
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username3249896
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#13
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#13
(Original post by abdullahAK)
I want to ask another question relating terminal velocity.
Q:When an object reaches terminal velocity,does it decelerate afterwards,when the terminal velocity phase finishes?
At terminal velocity, veloctity is constant. Acceleration is zero.
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Sinnoh
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#14
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#14
(Original post by abdullahAK)
I want to ask another question relating terminal velocity.
Q:When an object reaches terminal velocity,does it decelerate afterwards,when the terminal velocity phase finishes?
At terminal velocity the velocity is no longer changing, so...
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abdullahAK
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#15
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#15
No, I'm asking what happens after the terminal velocity.?
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username3249896
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#16
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#16
(Original post by abdullahAK)
No, I'm asking what happens after the terminal velocity.?
if it hits the ground and velocity falls to zero

then there is a deceleration
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abdullahAK
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#17
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#17
Anyone answer this question please?
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username3249896
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#18
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#18
(Original post by abdullahAK)
Anyone answer this question please?
Measure time for n oscillations (I would take n at least 20, so that measured time is > 20 s)
1 oscillation is the time for bob to go from P to Q back to P.
Repeat measurement
Find average time for n oscillations
calculate period,
period = average time for n oscillations / n
time required = 1/2 x period
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abdullahAK
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#19
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#19
Hello everyone.
I've a question relating physics.
I'll appreciate help.
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username3249896
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#20
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#20
(Original post by abdullahAK)
Hello everyone.
I've a question relating physics.
I'll appreciate help.
a) The force keeping it moving in the circle is the centripetal force and acts towards the centre

ii) F = mv^2/r
so as speed increases, force increases

b)i) the velocity is tangential to the path
so when it leaves the track, it will move in a straight line tangential to its path
so draw a tangent at P
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