i did 80x10-6 - 30x10^-6= 50x10^-6 4cm=0.04m so 0.04/0.000005=8000 but because it is going there and back (full reflection) you had to divide by 2 8000/2 = 4000 m/s
and i know this is wrong because i divided the speed by 2 instead of dividing the TIME by 2 how many marks would i get?
and one more thing, i am rubbish at standard form, that's why i got it so wrong. they shuldnt be allowed to put that in...
You'd get one definitely for applyign the equation, not sure about the other two though.
i put that tower doesn't fall over because the clockwise moment equals the anticlockwise moment so there is a balance and there is no resultant moment btw, how does the line of action lies within the base? the base was narrower than the sides
thats what i put it asked you to talk about the moments in the question not line of action
Probably the best unofficial mark scheme I've seen so far. I remember a question about ticking the correct two letters for angle of incidence and angle of refraction. I think the letters were B and D but I'm unsure about whether or not this is correct - could someone clarify???? Cheers
I dunno how but I got 0.5625 for the moments question. I just remembered the example in the CGP book about tension in the girder. And was the ultrasound question in milliseconds, because I got 0.0004
I dunno how but I got 0.5625 for the moments question. I just remembered the example in the CGP book about tension in the girder. And was the ultrasound question in milliseconds, because I got 0.0004
OMG same I got 0.5625 too because we did the moment divided by 0.36 (012+0.20), but I'm not sure if it was right
Tbh the first question answer is because the electromagnet is stronger and m and n is as you move closer to principal axis image gets smaller and upright at principle axis no image formed at m image is smaller and inverted