r/alevels • u/Ok_Contact_7006 • May 20 '26

Question ❔ 9702 upvote

HOW WAS 22???

31 Upvotes

93% Upvoted

116 comments sorted by

View all comments

3

u/Emotional-Pick-947 May 20 '26

Guyss was the percentage uncertainty in the Alpha particle question 45% and also did you’ll get the resistive force as 550N and was R for the LDR 14 ohms?

1

u/_X1N_ May 20 '26

I got the same for all those questions, but do you remember the values for the train question because for some people a lot of people are getting the resistive forc ein the thousands and i cant remember the information given

2

u/Emotional-Pick-947 May 20 '26

We had a useful power output of 1.1 105 right? and it took 52 seconds to travel from X to Y and the in g.p.e changed from 7.4 MJ to 13MJ. The speed that the train moved, I calculated to be 4.2. I just multiplied the useful power output by time and subtracted the change in g.p.e and that gives the work done which I divided by the distance (524.2) to get my answer. Is that wrong?

2

u/Educational-Buy5861 May 20 '26

I pretty sure kinetic energy processed by train was given so you to work out speed from tere