Physics: Post your doubts here!

[GarryTheGhost]

need urgent help for these physics questions. plz show workings/show why, answers are written with the questions.

 

[Holmes]

M/J 2016 (13)

 

[Holmes]

O/N 2016 (13)

 

[Holmes]

O/N 2016 (13)

 

[Holmes]

O/N 2016 (13)
with vivid working please !

 

[Holmes]

M/J 2016 (13)
Explain please

 

[Holmes]

O/N 2015 (13)
help out

 

[GarryTheGhost]

View attachment 62384
M/J 2016 (13)

v^2=u^2+2as
u=8
a=-9.8
s=1.9
therefore v=5.17.....
1/2mv^2=Ek
so 4.014J THE ANSWER IS A

 

[Holmes]

v^2=u^2+2as
u=8
a=-9.8
s=1.9
therefore v=5.17.....
1/2mv^2=Ek
so 4.014J THE ANSWER IS A

Thanks

 

[Holmes]

O/N 2015 (12)

 

[GarryTheGhost]

View attachment 62390
O/N 2015 (12)

using kirchoff 1st law conservation of charge we can say the current coming out of the cell is 1.2+0.4=1.6A
no we find the potential difference of the 80 ohm resistor. v=ir so v=96 since 1.2*80=96v
so terminal potential is also 96v because parallel components have the same potential difference.
using the formula
terminal p.d=EMF*current(internal resistance) or v=E-IR
we get 96=120-1.6r
so r is equal to 15 so the answr is A

 

[Holmes]

using kirchoff 1st law conservation of charge we can say the current coming out of the cell is 1.2+0.4=1.6A
no we find the potential difference of the 80 ohm resistor. v=ir so v=96 since 1.2*80=96v
so terminal potential is also 96v because parallel components have the same potential difference.
using the formula
terminal p.d=EMF*current(internal resistance) or v=E-IR
we get 96=120-1.6r
so r is equal to 15 so the answr is A

thnx

 

[Holmes]

2013 ... may...13

 

[DeadbeatCIE]

View attachment 62385
O/N 2016 (13)

I have the same doubt does anyone have a solution?

 

[student4563543]

View attachment 62385
O/N 2016 (13)

vertical:
v=u+at
v=8+(-1.62)(9)
v=-6.6ms-1
horizontal:
v=4ms-1
Resultant Velocity:
Sqroot of 4^2+6.6^2 = 7.7ms-1

 

[student4563543]

Ans is A
9702_13 2016

 

[student4563543]

Ans is D
O/N/13 V13

 

[amina1300]

http://papers.gceguide.com/A Levels/Physics (9702)/9702_m16_qp_12.pdf
Q37 anyone and 34..35

q 35 is quite simple
I hope you are aware of this technique of finding Resistance
R = (R1 * R2)/ (R1 + R2)
so it can be done like
8 = (R* 2R)/(R1 + 2R)
straight it out and you get R= 12

I guess you did it like this 8= ;[ 1/R + 1/2R ]^-1
2R/3 = 8
and R = 12

Thankyou the help.

 

[amina1300]

Ans is D
O/N/13 V13

Total distance = 200 km
Avg speed = 80 kmh^-1 for 90 km and time taken to travel this distance = 90/80 = 1.125 hrs
Total time = 2 hrs
Time left = 2- 1.125 = 0.875 hrs
Distance left = 200 - 90 = 110 km
speed which should be taken = 110/0.875 = 125.7.. = 126kmh-1 (D)

 

[amina1300]

Ans is A
9702_13 2016

The Electric Field is upwards hence the Potential of the upper plate should be lower than the lower plate.
EFS= V/d
60000= - x - 80/4x10^-3
x= -320 (A)