Question

Please help:)

Answer 1

@satellite73

Answer 2

@saifoo.khan @Callisto

Answer 3

Q3 = D?

Answer 4

For 33, by right hand grip rule, A and B are correct
Since the current travells in the same direction, they attract each other.
So, B, I think..

Answer 5

@saifoo.khan the answers says its B....@callisto, isnt it the left hand rule

Answer 6

:O
I think it's right hand grip rule which determine the direction of B-field... :S

Answer 7

How it's C? D:
the acc increases until it attends terminal vel.

Answer 8

np the answer is B..@saifoo.khan

Answer 9

@callisto, how do u find the direction when its a circle..(according to the thumb)

Answer 10

For Q3, I also think that it's C...
Because of air resistance, acceleration decreases (take downward as positive)
And because of force of gravity, the vel. increases (at a decreasing rate) unitl it reaches the terminal velocity

Answer 11

For right hand grip rule: http://www.google.com.hk/imgres?imgurl=http://sciencecity.oupchina.com.hk/npaw/student/glossary/img/right_hand_grip_rule_1.jpg&imgrefurl=http://sciencecity.oupchina.com.hk/npaw/student/glossary/right_hand_grip_rule.htm&h=245&w=248&sz=31&tbnid=ufkyS0EW_j01mM:&tbnh=90&tbnw=91&prev=/search%3Fq%3Dright%2Bhand%2Bgrip%2Brule%26tbm%3Disch%26tbo%3Du&zoom=1&q=right+hand+grip+rule&docid=kwi55r2RdyThWM&sa=X&ei=M7y1T7jUPMi1iQfM1MD-CA&ved=0CGMQ9QEwAg&dur=596

Answer 12

foce of gracvity i dont get it @Callisto

Answer 13

Gravitational force.... which attracts things on the earth to the centre of it..

Answer 14

i mean then how can velocity increase

Answer 15

The apple story of Sir Issac Newton....
summation F =ma => there is a acceleration when the things are dropped => velocity increases

Answer 16

when a=0 , v=constant

Answer 17

hm okay @Callisto i get it ...YOU ROCK <3

Answer 18

Wow!!~ You know, I'm not good at Physics, that's the only thing I know lol (Kidding, but not good at Physics is the truth :P)

Answer 19

hahha....r u kiddin me..:P

Answer 20

not good at Physics is the truth...

Answer 21

okay can u answer this, i need explanation

Answer 22

Based on the numbers on the images:
Question #1: A
Question 3: D
Quesiton 33: Not sure...but I am sure it's either A or B based on the right hand rule.

Answer 23

1) D .... Not sure

Answer 24

I believe #1 is A since under a constant acceleration of gravity, speed will increase linearly.\[V_f=V_0+at\]

Answer 25

Acceleration shouldn't increase ....