Edexcel Physics Unit 1 17th May 2012

Can somebody please explain why the answer to this question is 'b'.

Since the lift starts at 0ms_1, it has to accelerate to start moving. Since it is moving upwards, this acceleration is positive. Once it reaches it's speed, the acceleration goes to 0 as it is moving at constant velocity. When it's about to reach the desired floor, it has to decelerate. This acceleration is negative. Once it has hit 0ms^-1, the stops decelerating and remains at rest.

Hope this helps =]

Reply 201

LegendX

15

In what chapter of the book d they mention logic gates?

Reply 202

Zues

Original post by LegendX

In what chapter of the book d they mention logic gates?

I don't remember logic gates at all. You doing Edexcel?

Yeh

Light gates even

I'm sue there is n real mention of light gates and then they've just randomly put p an exam question.

Reply 206

raheem94

13

Original post by Zues

Since the lift starts at 0ms_1, it has to accelerate to start moving. Since it is moving upwards, this acceleration is positive. Once it reaches it's speed, the acceleration goes to 0 as it is moving at constant velocity. When it's about to reach the desired floor, it has to decelerate. This acceleration is negative. Once it has hit 0ms^-1, the stops decelerating and remains at rest.

Hope this helps =]

+rep

Reply 207

LegendX

15

Raheem ur retaking this exam?

Reply 208

Zues

Original post by LegendX

Light gates even

Oh light gates. They come up in mechanics. Usually for experiments as they are more accurate since people can have different reaction times so using a stopwatch can be inaccurate.

I'm gonna go to bed so good luck everyone =]

Reply 209

raheem94

13

Original post by LegendX

Raheem ur retaking this exam?

Yes, got 98/120 in jan, will try to do better this time.

Reply 210

zulfarhan92

as i revised the past year questions
i realised they kept making questions on the application of eddies due to turbulent flow
can anybody list down the effects of eddies on a moving object?
thank you =)

Reply 211

zulfarhan92

what would your answer be for this question *picture below*

Reply 212

zulfarhan92

given that weight is 638 newton

isnt the equation:
W= Tsin 40
T= W divide sin40
right?

Reply 213

ShmangoBaby

Original post by zulfarhan92

given that weight is 638 newton

isnt the equation:
W= Tsin 40
T= W divide sin40
right?

Yes i think you're correct :smile:

Reply 214

99llewellyn99

1

Original post by zulfarhan92

as i revised the past year questions
i realised they kept making questions on the application of eddies due to turbulent flow
can anybody list down the effects of eddies on a moving object?
thank you =)

basically all that turbulent flow does to a moving object is slow it down.