Edexcel PHYSICS Doubts

[Saladin]

Thank you very much sir. + REP

[Saladin]

Sir would you be kind enough to answer the questions 2(a) 2(b) and 5(c) in more detail please.

[astarmathsandphysics]

for  2a)if the ball hardly changes direction becuase the batman hots a glancing blow then then the momentum will hardly change. Inpulse =change in momentum so is small
b)Impulse=m(v-u)=m(-u--u)=-2mu becuase ball is hit right back to batsman
5c)rubber is better at absorbing energy than metal or wood.

[Saladin]

for  2a)if the ball hardly changes direction becuase the batman hots a glancing blow then then the momentum will hardly change. Inpulse =change in momentum so is small
b)Impulse=m(v-u)=m(-u--u)=-2mu becuase ball is hit right back to batsman
5c)rubber is better at absorbing energy than metal or wood.

Thanks again!

[Ghost Of Highbury]

Y is it B?

Cud someone explain with a diagram?

[Saladin]

Y is it B?

Cud someone explain with a diagram?

This is because the car is moving, and the reaction is opposite to the combined force of the car. Which is a diagonal force.

[Ghost Of Highbury]

Thanks. This one too.

http://img94.imageshack.us/img94/7417/blahfu.png

Answer : 1.4m/s^2

[Saladin]

Thanks. This one too.

http://img94.imageshack.us/img94/7417/blahfu.png

Answer : 1.4m/s^2

LOL at the image name "Blahfu"

There are two forces acting here, the force of gravity acting on the block, and the force of friction, which is 6N.

The force pulling the weight down is,

Therefore, the net force is,

Now, when doing these calculations, there is uniform acceleration, because the acceleration of the 8 KG box is the same as the acceleration of the 2 KG box.

So,

[nid404]

Thanks. This one too.

http://img94.imageshack.us/img94/7417/blahfu.png

Answer : 1.4m/s^2

2g-T=2a
T-6=8a

solve simultaneously

14=10a
a=1.4m/s

[Ghost Of Highbury]

Thanks dude, that is what i wanted.

@Nid - Cud u plz rite the steps abts solving the equations simultaneously with 3 variables. Thanks

[cooldude]

Thanks dude, that is what i wanted.

@Nid - Cud u plz rite the steps abts solving the equations simultaneously with 3 variables. Thanks

dude, there arent three variables g is a constant, neway if u still want the working here it is-->

2g-T=2a
T-6=8a
T=2g-2a, and T=8a+6
8a+6=2g-2a
10a=2g-6
g=10
10a=20-6
10a=14
a=14/10=1.4

[Ghost Of Highbury]

dude, there arent three variables g is a constant, neway if u still want the working here it is-->

2g-T=2a
T-6=8a
T=2g-2a, and T=8a+6
8a+6=2g-2a
10a=2g-6
g=10
10a=20-6
10a=14
a=14/10=1.4

ahh, terrible error.

Thanks mate and thanks nid.

[nid404]

anytime 

[Saladin]

Guys I need help with this Physics question. Please assist!

The questions are attached.

1) I got velocity as ms^-1

2) a) I got velocity as ms^-1
    b) I got force as 100N

3) I explained that The boy goes to the right of the boat, and according to Newton's third law, the boat exerts an equal and opposite force     moving away from the boy.

4) Confused about the calculations involved.

5) Please help on this as well, I will check my answers when someone has posted.

[M-H]

i'll post soon