Recent content by adrienne

of course I've tried all the questions on the work sheet... but i missed this two! and now I'm at home and i simply can't sneak back to sch and steal the CRO and do the experiment again! >< i guess there'll be no change when AC is on and the trace'lll become a straight line lying on the x-axis...

what is the use of AC-GND-DC switch?? wt will happen on the screen if a dry cell is connected to the CRO with AC-GND-DC button switched to AC?? then wt will happen if GND is on??

long report on timing oscillation. help! i'd like to ask how do we write a long report on an experiment ( timing oscillation) pls help! the links of this experiment handout: http://hk.geocities.com/touchthetrace/time1.jpg http://hk.geocities.com/touchthetrace/time2.jpg i'd like to ask...

then i see. i should mind the wordings, right? : ) i heard sb sayin' if the angle of deflection is high, the friction between the glass rod and string will increase. but the contact surface area is the same! how can we explain that??

oh... one more question: where is the tension force comes from? if it comes from Mg, why can it balance the gravity?

oh i see. : ) just now i realized the centripetal force is from Mg and Mg=T... so the relation between M and m is M=m/cosθ ??

what is the meaning of this equation??

yes i understand the equation. how can we make the forces be balanced??

why can't i make it more horizontal if i tried to keep L constant throughout the experiment ?? when I'm doing this 'experiment', the deflection is too large that the bung hit my head!

yes. but is there a chance for the string to move up instead of slightly deflected?

isn't tension acts along the string??

sth about centripetal force. pls help! >< i got some problem about centripetal force. in this experiment, " http://www.smcc.edu.hk/phy/Experiments.files/Centripetal%20Force.doc " my hand apply a horizontal force, to give the velocity 'ω' to the stopper thing. when i decompose ω into vectors...