WJEC A2 Physics Unit 3: Oscillations and Nuclei 4th June 2018

So the velocity is 90 degrees out of phase with the displacement.
The kinetic energy will follow the same graph as the velocity but there are no negative values

One of the questions which took me a while to get was the one with mass and 4m string [SMH]. It asked for Vmax but for some reason i just couldn't find the Amplitude-after the reading the question about 6 times. But did you guys use 0.25m or 4m for the Amplitude?

0.25

The max velocity was like 0.39 right?

Yes. What did you have for max ke? I couldn’t get the same answer using 1/2m*vmax and using their equation

For the energy lost in the SHC question did you guys use 1.6 or 2.2 as the mass?

I'm confused on what question you're on about...

The max ke was 3.8x10^-3 i believe.

For the energy lost in the SHC question did you guys use 1.6 or 2.2 as the mass?

I used 1.6 as the mass and did 1.6x4200x22 to find the energy lost

For the last SHM question how did you do it? did you have to half the Time period to find x? I had x=-0.15

The part right after calculating the new temperature as 78C

Ohhh right, Umm i used the mass for the 100degrees flask. Can't remember the value tho. Might be the 1.6kg one

Ah *******s didn’t do no negative values for kinetic energy! So did you velocity graph look like a sin graph but going negative first?

Alright good I did the same