9702_s10_q11 !!!!!!!!PHYSICS!!!!!!!

[supermagic]

Question number 4,8,18,27,28,29

but for q8, i have doubt
acc=change in velocity/change in time
= 6-4/3-0
= 0.67 shouldnt it be A ?? but the answer is C...... wth

 

[beacon_of_light]

Q4: 6cm makes 8 waves. So 1 wave ---------> 6/8 cm
1cm ----- > 10ms ; 6/8cm ---------> 6/8 x 10 = 7.5ms
f= 1/T = 1/ (7.5 x 10^-3 ) = 133Hz that is approximately equal to 140Hz!

Q8: Graph is not a straight line or acceleration changes at every instant. To find acceleration at any point, draw a tangent to the curve at that point ! U'll get your answer !

Q18: Since, water is denser than ice, as ice melts, distance b/w atoms decrease and as a result of close packing, density will increase !

Q27: As Electric field strength is the same at P and Q, no work will be done in moving the charge from P to Q ! Consider the circumference of circle as an equi-potential line, and Electric field strength on this line is always constant, no work is done in moving charge 4rm one place to another on the same equi-potential line !

Q28: E = F/Q , F= EQ since, E remains constant b/w the plates and Q on the electron never varies... F on the electron will be a constant value i.e EQ.......

Q29: Using left hand rule, and taking current as a conventional one, find out the direction in which the electron beam deflects. Index finger points away from the observer, second finger at right angles to the index finger and to the left, so the thumb points towards the observer !

Hope you get that

 

[supermagic]

Thx very much!

u solved all questions!