Recent content by sdapin

Second question Let the horizontal line to be H, The opposite line of the angle of the upper part of the triangle to be Y, opposite line of the angle of the lower part of the triangle to be X, the height of the higher building to be X+Y use the method of tangent to build up all the equation...

1st question, the pellet is going downward, its accelerating, so the acceleration wil be positive but not negative

anyone can explain to me?...

i checked the site, it provide many explanation, but the sentence "the difference in height between point 2 and 6 provide the energy" wifout any explanation make me disappointed once again...i nid some numerical explanation, but i can't done it myself as i hav tried for a long time, sigh

emm if the screen is placed exactly at the point where the point of intersection, the image is sharp, if the screen is place backward or forward the image become blur, can anyone explain tis? second qn is...emm wel i understand tat the column of water outside the reservoir is longer hence...

i think 1st qn i hav no prob d, thanks for second qn, i'd search thru google, but couldn't find an article tat explain in details wat i interest to kno is the "h" onli, y it onli nid to draw til the surface of water but not the whole column of liquid?

helo guys i hav 2 qn to ask here from wat i read from web and books, a virtual image is a image which form behind the mirror, jus because of light can't pass thru the mirror but our brain think it as a image behind mirror so my qn is where does the image actually form? second qn, a syphon...

well thanks for info i hav another QN, for the lift, y we can't add the net force into the weight?since add up it oso produce a same net force issit?they r acting on same object oso, net force downward and it reaction force on the man, weight downward and it reaction on the man too?am i get...

the force exerted back is always enuf to stop the 1st ball immediately no matter how fas it move toward the stationery one?can u somehow give some example of calculation in oder to make me more understand?what i wonder is, y the 1st ball won't bounce back like what we seen in real world, if...

if a smaller mass ball collide wif a bigger mass ball or vice versa, wat wil happen and y?' sry so many question, but i need to totally understand the whole topic, else i will stuck there...thanks

thx for all answer to my QN. really help a lot! ok now regarding third law, i saw a situation in my reference material lets say there is 2 ball., one is stationary, one is moving the stationary, after they collide, the moving one wil stop and the stationary one wil move wif the same velocity...

so can we calculate the force nid to produce the acceleration given?we know the net force. i.e. a guy wif mass 60kg in a lift at acceleration of 2ms-2, is 120N.does tat mean the lift system exert 120N on the lift to accelerate it wif 2ms-2?if not, how much force is nided in order to produce the...

emm, i m new member here maybe i m stupid and young enuf to ask these question, but i seriously nid help from u all to explain to me 1st, if we standing on a weighing machine in a lift, when the lift accelerate downward, the reading of W.M. wil decrease?and when accelerate upward the reading...