Physics: Post your doubts here!

[pennies]

how do u solve this....? the answer is supposed 2 be C..

 

[pennies]

i dont understand why the answer is C...

 

[pennies]

can someone solve this question?

 

[pennies]

help??? why is the answer B?

 

[pennies]

can someone explain this question?

 

[tanmaydube]

please share the list of formulas and definitions for as level

thank you for helping...

 

[pennies]

please explain why the answer is A?

 

[pennies]

can somebody explain this question and why the answer is C??

 

[pennies]

why is the answer A not B?

 

[yuliana95]

please explain why the answer is A?

Since the LDR intensity increases, so the resistance in the LDR decreases, hence there will be more voltage in the fixed resistor. Since the voltmeter is located to the LDR, so the voltage also decrease there.

 

[pennies]

can someone please explain this question to me?

 

[abcde]

D! As the temperature decreases, the resistance of the thermistor increases and so does the p.d across it. As a result, the voltmeter reading increases because it is connected across the thermistor in D.
Is this the correct option, pennies?

 

[Swoorup]

why is the answer A not B?

image of question number 13/Page 31

The answer is not B because in B the resultant of the two forces(the rods that support the weight) gives the force equal to the weight itself in both the direction and magnitude. But if you consider A,
The resultant of the two supporting rods gives the force that is equal and opposite to the weight, which thus justifies the equilibrium condition

 

[Swoorup]

D! As the temperature decreases, the resistance of the thermistor increases and so does the p.d across it. As a result, the voltmeter reading increases because it is connected across the thermistor in D.
Is this the correct option, pennies?

I am uncertain whether its A or D

 

[pennies]

the answer is D

 

[Abdulrab]

http://www.onetwothreeexams.co.cc/aleve ... 5_qp_1.pdf Q 3,7 and 22 please answer with full explanation !!! try to it asap guys !! thanks

 

[pennies]

the answer for 7 is B because the value of acceleration due to free fall is always -9.81.....
the answer for 22 is D because young's modulus= stress/strain= Fl/Ae
F(p)=AeE/l
F(q)=AeE/4l
F(p)/F(q)=4/1

 

[rz123]

3.the estimate for the velocity must be 4 to 5 m/s max. so taking this it will give B by using 1/2 mv ^2

7. B, when the ball is rising its decelerating caz the gravity is down. so -9.81 at max point its still negative and while going down the sign has to be negative as u assumed the upper motion to be positive.

 

[DaEconomist]

http://www.xtremepapers.com/CIE/Interna ... 4_qp_1.pdf

Please help with question 20.

Thanks

 

[yuliana95]

http://www.xtremepapers.com/CIE/International%20A%20And%20AS%20Level/9702%20-%20Physics/9702_w04_qp_1.pdf

Please help with question 20.

Thanks

The answer is A. 1/2