phys doubt

[Phosu]

could someone plz explain how to solve these questions

cie
Jun 02 pp1 question 14, 21 and 23

Thanks : )

[Saladin]

The answer is attatched.

[astarmathsandphysics]

thanks dude

[Phosu]

im kinda confused with the concept of momentum

for eg ques 12 pp1 may/june 06,
the trucks collide and stick together and then the question asks to find its speed after collision, how can there be a resultant speed if they stick together on impact?

aside from that i have a doubt on solving 2 more questions from the same paper, question 33 and 34

Thanks

[astarmathsandphysics]

They stick together and move togther - a single particle with mass m1 +m2

[astarmathsandphysics]

33)4v
for the top route the 12v is divided in ratio 1@ ie 4v:8v so midpoint is at 4v
but for the bottom bridge it is 2:1 ie 8v:4v so midpoint is 8v
difference between midpoints is 4v

[astarmathsandphysics]

34)the voltage accros the resistor is 12* 3/(3+1)=9v
p=V^2/R=9^2 /3=27

[Phosu]

nov 08
paper 1 ques 11, 21, 31

[astarmathsandphysics]

11. Resloving for 2kg mass 2g-T=2a
resolving for 8kg mass T-6=8a
add these two 2g-6=10a so a=(2g-6)/10=1.4 c
21)c think of resistors in paralell and series. Maximise the resistance or extrension.
31)R=pl/A so halving the diameter means the resistance =pi*l/(d^2/4) is 4 times bigger and the current is divided by 4. d

[Phosu]

plz explain how to solve
Nov 09  paper 1, ques 8 and 12,

[astarmathsandphysics]

When I get home

[astarmathsandphysics]

Can you post a link to the paper

[Phosu]

here you go

[astarmathsandphysics]

Thanks. Home in 2 hours

[halosh92]

33)4v
for the top route the 12v is divided in ratio 1@ ie 4v:8v so midpoint is at 4v
but for the bottom bridge it is 2:1 ie 8v:4v so midpoint is 8v
difference between midpoints is 4v

could u explain this in furthur details, like how did u get the voltages first?
and could explain question 12 indetail 2.
thankyou