AS Physics P1 MCQs Preparation Thread.

nafis shahRiyar

nafis shahRiyar

Messages
48
Reaction score
5
Points
18
h4rriet said:
I put in numbers for this. Say V = 6 V and the resistance of each resistor = 2 ohms. The PD across the combination QR = 1/3 x 6 = 2 V. The Power through resistor R = (2^2)/2=2.
Click to expand...

how can you put some values and *say* V=6V or Resistor = 2ohms? o_O these values are not given bro.
 
Your-Blood

Your-Blood

Messages
99
Reaction score
65
Points
18
faizay warsi said:
plx ans tha following 9702/11/O/N/10...... Q9 7 18 & 37
Click to expand...


Please also give link next time :)

Q.9
Let deceleration = 2ms-²
Initial velocity = 10ms-¹

Use v = u + 2as

Final velocity zero since it comes to rest
0² = (10)² + 2(-2)(X)
X= 25m

Now 20% increase in speed makes it 12 ms-¹

So
0² = (12)² + 2(-2)(X)
X = 36m

36 / 25 = 1.44
So 1.44X


Q.7

Since it is a tall building gravity would make the ball fall vertically and the horizontal velocity of the body would become zero after some time
Since it is falling under the presence of air resistance the ball would initially accelerate at 9.81ms-² But acceleration would become zero after some time.So vertical velocity would first increase and then become constant.


Q.37


Simply use potential divider

When at X
V = (10 + 10 / 20) x 4
V = 4v

When at Y
V = (10 + 0 / 10 ) x 4
V = 4v

So 4 for each
 
talha-_-khan

talha-_-khan

Messages
71
Reaction score
76
Points
28
Is voltage a vector or scalar quantity?
Answer:​
In DC(direct current) circuits, voltage is scalar. But in the case of alternating-current(AC) voltage is vector quantity. It is because in an AC circuit the current is changing the direction for every time period. Therefore, since in this the direction matters its a vector quantity.
Regards.


#==>Why isnt it the same for current that current is vector in Ac but scalar in DC
 
Ahmedraza73

Ahmedraza73

Messages
1,442
Reaction score
7,812
Points
523
You must log in or register to reply here.
Top