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He is lifting himself which means he must be applying force that is equal to his weight.Why is the answer B:-
View attachment 22035
oh lucky meYes, you gave the correct answer i.e. the answer is C. Thank you very much for your kind help.
use the formula, Driving force - resistance = mass * accelerationCan someone please tell me why the answer is A:-
View attachment 22034
please please help me with b(i) and (ii), i was not able to draw both figures in the graph as well as on the diagram. I could not draw using the guidelines given in the marking scheme., so i would be thankful if anyone drew them for me.
The questions are uploaded.
thank you very muchThis is how the graph should look.
View attachment 22052
Output of the comparator = voltage at non-inverting input (V+) - voltage at inverting input (V-)
Whenever the value of (V+) - (V-) is positive the output voltage is +5, when when the value of (V+) - (V-) is -ve the output voltage is -5. There is a change over between +5 and -5 when (V+) = (V-), in this case when both voltages are 2V.
And the diodes should be connected this way-
View attachment 22053
You can see from the graph of the output that the output is positive for a longer time than it is negative. The question said the red diode remained on for a longer period of time. So, it must conduct when the output is positive, that's why it's connected pointing downwards. The reverse is true for the green diode. It conducts when the output of the comparator is negative, which is for a shorter period of time, hence it points upwards.
Help needed on questions 4.)......5.)........6.)........21.)..............24.).......29.)
i need da concept and some explanation PLEASE>>>PLEASE!!!!!
thnk you!
thanx alot!!!!!!!!!!!Q:6
the area under the graph is triangle so :1/2*b*h
1/2*5*20=50 m
so the answer is C
Q:24 Only transverse wave can be polarized because polarization is said to be occur when oscillation are in one direction in a plane.so the answer will be D
Q:29 E=V/D,
V =9.0
D=4.0*10^-3
PUTTING INTO EQUATION WE GET 9.0/4.0*10^-3=2.3*10^3 NC^-1
so the answer is D
Q:4 UNCERTANITIES ALWAYS ADDED SO IT WILL BE +_0.05mm
so D will be the answer
Your Welcomethanx alot!!!!!!!!!!!
First consider the forces acting on the pivot:Why is the answer C:-
View attachment 22111
The Answer will be B that i think so,PLEASE do tell me if i am right?
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_w12_qp_41.pdf
Help needed on Q5, part (b)! Why, when calculating the charge on plate X, we use the effective capacitance and not the actual capacitance of X? Then when calculating the charge on Y, we then use the actual capacitance of Y, and a voltage of 3? This is all very confusing . Help would be greatly appreciated!
Can someone please explain why options A, B and C are wrong and option D is correct:-
View attachment 22137
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