Year 12s: what will be the first way you research your future options? >>

OCR MEI M1 June 12th

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Found it good, got all the same answers apart from Q2 pt ii, where it said find the mass, when you show that k=-4 you then get (-4*5j) + (4.5j) + (wj) =0

so wj = 15.5j

mass = 15.5/9.8 = 1.58kg

I can't see what I've done wrong, people are saying they got 2.5kg, but that meant losing the sign on the 4.5? Anyone aha? Unless I misread it...

You have messed up your signs most definitely.

That exam was one of the easiest I have ever done in my life, half of the questions they had just checked your answers to previous questions for you.

Reply 241

will init blud

Original post by AR_95

I don't get it. Why would the cannon ball fly a further distance if the acceleration is 9.8. Horizontal displacement is given by x = ut so vertical acceleration doesn't affect horizontal displacement??I said it had no effect :/

Surely common sense tells you if it loses its vertical speed slower and gains downward speed slower it hangs in the air for longer and so will travel further?

Reply 242

Fariko-Blaze

Original post by will init blud

You have messed up your signs most definitely.

That exam was one of the easiest I have ever done in my life, half of the questions they had just checked your answers to previous questions for you.

Yeah must have done, other than that though should have got everything else, was fairly easy

Reply 243

student992

grade boundary estimates? lower than 49??

Reply 244

charlesbatchelor

Original post by Louiehunt

if that was for the second last question, i think you may have got it wrong, I went through all the workings out without adding G for the component of the weight down the slope and I got 3.44, but when it came to the next question, Nothing i did got my answer of T=2300N from (ii).. then i realised and went back through it and got 0.351 degrees which then allowed the next question to give 2300N (2dp)