gazz49

Hello, 

I need some help....please 

A mechanic changed my brake discs and pads on my bmw 420d series (16 plate) and today my tracking is slightly off, I have to slightly turn the wheel right to go In a straight line. This only started since yesterday’s disc and pad replacement. It was driving fine before. 

I went back to the mechanic and he told me that the two are not connected? And that changeing the discs does not affect the tracking/alignment 

what I would like to know is, is he correct? Should I believe him ?

I’ve had a BMW 4 series 16plate car checked and inspected by AA And they’ve said it’s excellent condition scoring 90/100 on a 204 point check. 

The only thing is the MoT is due in Nov and also a service, the price of the car is about 15k and this is a private seller

Advice please ? Yay or nay? 

Mileage is 32k - Mot has been extended due to covid 

I’m thinking of buying a used bmw 4 series 420d m sport for around £15000. But I’m aware the face lift Model is coming in October this year 2020. Should I wait till October and see if the older models depreciate further or shall I go ahead and buy this car? 

If they do depreciate will I be saving a lot or is something in the regions of £100-£200. 

Any answers or advice would be appreciated. 

list the thermodynamic parameters linked through maxwells relations. what is the main application of these relations?

2) derive the heat capacties experssions as functions of entropy using the follwoing thermodynamic relationships

dH=TdS+VdP

dU=TdS-PdV

My rotating drum mixer has a diameter of 2m and a length of 5m, made from stainless steel im producing 45t/ph of detergent powder. a residency time of 3 mins. my density of the mixed product 450g/l. How do i calculate the weight of the drum. how do i calculate the power required. 2250kg are passed through every 3 minutes.