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OCR MEI M2 - 18th May 2016

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Thanks for the reply and I think that your answer will end up being correct according to the mark scheme...

However, how do we know when it says 'It is projected with a speed of 10ms^-1" relative to P", that this 10ms^-1 is measured at the instant after firing and not the instant before?

In this situation, what gives the instant after firing priority over the instant before firing?

If this question is out of 4, how many marks do you think I will get for my method? 2?

Because at the instant before, it hasn't been fired yet; it's still "attached" to P. So it can't have a speed of 10ms^-1 relative to P at that moment. It has to have the same speed as P.

Yeah, probably 2.

Reply 101

¡Muy bien!

Is anyone here doing M3?

Reply 102

username1258398

Original post by ¡Muy bien!

Is anyone here doing M3?

Yup, looking forward to it. You?

Reply 103

chemari1

if for one of the rods, I put in my working out that the tension in it was 393 newtons, but in a written sentence I say it's 394 and that it's in tension what marks would I get?

Reply 104

¡Muy bien!

Original post by StrangeBanana

Yup, looking forward to it. You?

I wouldn't say looking forward to it :colondollar:

but I am preparing for it.

Reply 105

-Gifted-

Original post by StrangeBanana

Yup, looking forward to it. You?

I am doing it as well, do you not find the SHM and the spring/ elastic string questions hard? They confuse me, especially in SHM when they say like
'Find the distance travelled...' or ' Find the time taken...' etc...

Reply 106

badmanting123

for the question about the bullet i got 0.2 exactly again?

i was like wth? did anyone else get exactly 0.2

Reply 107

-Gifted-

Original post by badmanting123

for the question about the bullet i got 0.2 exactly again?

i was like wth? did anyone else get exactly 0.2

I don't think you considered final kinetic energy of the block and the bullet. If you do, you get 0.198 m.

Reply 108

chemari1

I got 51, maybe 52,( even if this tension in one of the rods is wrong I'll get a follow through mark; I put in my working out the tension of a rod as 393, then in a written sentence 394 and that it's tension; by putting that it was in tension I'll get 1 mark I suppose but what about the 393 or 394 what mark will I get?