Physicsquest

I recently had a clutch fitted in my Honda jazz 2005 version 1.2 ltr and the gearbox oil seal was leaking, they repaired it after taking it back but now after 3 months its leaking again. I can't be bothered to take it back because I cant be bothered with the arguments, how long should this job take about?

I would like to see if anyone could do a Payday loan poem about how the cause misery, hard times, etc?

10 points to the poem i like best, thanks!

Hi, i need some advice about holiday rules/law in the UK. We have been given 2012 holiday memo, we work full time (38.5 hours) over 5 days a week. We have been told on the memo that due to a recent European directive that no holidays are allowed to be carried forward into the following year. I have searched google and cannot find information about this directive, what i have found however on my research is that you are allowed 28 holidays and you are allowed by law to carry a max of 8 holidays into the following year. Can someone please confirm what is true about this, thank you, Best answer will be awarded, can you also state your position, IE: Solicitor, etc, so i can get a grasp who are talking sense and who are not. Thank You.

when a blue light source is placed at the center of a solid glass cube, a circular spot of light appears on a white screen in front of the cube. if the blue light source is replaced by a red light source the spot appears as a square.

10 points for first correct answer

I have a definition of Reynolds number as being Re = pLovo/n (p=density, Lo=radius?, vo=speed, n=viscosity).

I also have the equation f(Re) = Fd/pLo^2 vo^2. I understand that this is another dimensionless number to do with scaling. If so, how?

I'm not sure what the term Fd is when doing this scaling & also how, when a sphere is going through a liquid this term is found to be f(Re) = 6(Pi)/ Re, or is this last one just an example to answered in a separate question?

Air at 60 degrees C is initially contained in an insulated piston-cylinder container with a volume of 0.4m^3 at 4 bar pressure. It proceeds to undergo a sequential series of thermodynamic changes.

Process 1: constant pressure heating until the temperature reaches 150 degree's C

Process 2: Constant volume cooling until the pressure reduces to 3 bar, and

Process 3: Polytropic compression, where PV^1.5 = constant, until the volume becomes 0.1m^3

Assuming that the characteristic gas constant of air is R = 290 j/kgK

determine the temperature of air after process 2.

Best answer will be awarded. Thanks.

Oxygen trapped inside an insulated smooth piston-cylinder apparatus has a volume of 0.3m^3, pressure of 2.5bar and tempreture of 20 degree C. It is then subjected to the following thermodynamic processes sequentially:

Process 1: heating under constan tvolume condition until its temperature increases to 120 degree C

Process 2: Undergo polytropic expansion where PV^1.4 = constant, until its volume increases to 0.5m^3

Process 3: Cooling under constant pressure condition until its volume decreases to 0.4m^3

Assuming:

Universal gas constant = 8.314kJ/kmol.K, and

Molar mass of oxygen molecule = 32kg/kmol

Determine:

The pressure of oxygen after process 2.

a) 1.64 bar

b) 1.22 bar

c) none of above

Can you please show your work.

Best answer awarded.

Oxygen trapped inside an insulated smooth piston-cylinder apparatus has a volume of 0.3m^3, pressure of 2.5bar and tempreture of 20 degree C. It is then subjected to the following thermodynamic processes sequentially:

Process 1: heating under constan tvolume condition until its temperature increases to 120 degree C

Process 2: Undergo polytropic expansion where PV^1.4 = constant, until its volume increases to 0.5m^3

Process 3: Cooling under constant pressure condition until its volume decreases to 0.4m^3

Assuming:

Universal gas constant = 8.314kJ/kmol.K, and

Molar mass of oxygen molecule = 32kg/kmol

Determine

(i) the characteristic gas constant of oxygen in kj/kgK.

(ii)the mass of oxygen in the piston-cylinder apperatus

(iii) the pressure of oxygen after process 1

(iv) the pressure of oxygen after process 2

(v) the temperature of oxygen after process 3

Best answer will be awarded.

Hi can anyone have a look at the link and see if they can help out with the questions?

http://www.physicsanswers.co.uk/standing-waves-and...

Best answer will be awarded.

Thanks.

The displacement, s (m), of an object from a fixed point O can be described as a function of time, t (s), as

s=6t^4 - 2t^3 + 3t +2

Determine the displacement, velocity and acceleration of the object at t=5s. Calculate the times when the acceleration, a (m/s^2), is zero.

Answers below:

@t=5s

displacement= 3517m

Velocity= 2853 m/s

Acceleration = 1740 m/s^2

Then it says..

Acceleration = 0 m/s^2

@t=0s or t=0.17s

can anyone help explain and show the work?

best answer awarded.

1) what is the magnitude of force (F) ?

2) what is the magnitude of the force the pivot exerts on rod at point 0 ?

Here is the link to the image:

http://www.physicsanswers.co.uk/finding-magnitude-...

10 points for first correct answer

The bars are in equilibrium, each 2 m long,

and each weighing 73 N. The string pulling

down on the two bars is attached 0.4 m from

the fulcrum on the leftmost bar and 0.3 m

from the left end of the rightmost bar. The

spring (of constant 29 N/cm) is attached at

an angle 39 degrees at the left end of the upper bar.

If the suspended mass is 5 kg, by how much

will the spring stretch? The acceleration of

gravity is 9.8 m/s2 .

Answer in units of cm.

Diagram link: http://tinypic.com/r/18khmu/7

10 points for best answer.

Which do you prefer? would like to see others views.

http://www.bimmerbanter.com/bmw-f20-vs-audi-a3_top...

I have a 136bhp 2001 E46 320d and I can’t get rid of a power dip around 2100rpm!

I have replaced the MAF (ECU updated by BMW), manifold pressure sensor, turbo pressure converter (and vacuum tubes). and I am still getting a lump of power around 2000rpm and then it dips and then slowly regains up to full.

Could it be a dirty EGR valve or dirty inlet manifold or worse a failing turbo?

10 points for best answer

Coolant level warning light keeps coming on?

Any idea's

heres the full link to problem:

http://www.bimmerbanter.com/coolant-level-warning-...

10 points for best answer

Hi,

I just opened a new forum.

I'm looking for comments or suggestions on my new forum image banner.

http://www.bimmerbanter.com/

10 points for the answer i find most helpful.

Can anyone answer this?

The figure shows the meter used to study the motion yB = bsinωt.

The motion of the mass relative to the frame is recorded on the drum.

If l1= 360 mm, l2= 480 mm, l3= 600 mm, m = 0.9 kg, c = 1.4 Ns/m and

ω = 10 rad/s, Determine the range of the spring constant k over which the magnitude of the recorded relative displacement is less than 1.5b. It is assumed that the ratio ω/ωn must remain greater than unity

http://www.physicsanswers.co.uk/damped-forced-vibr...

If you half fill a straight glass, then put a beer mat or coaster on the top of the glass then turn it upside down, holding the mat/coaster on, the water compresses by approx 25%, if you don't believe me then try it.

My question is:

Why and how does this happen? i was always led to believe water can only compress by a very small fraction. It really is bizarre!!

Hi,

I have a 520i se auto BMW, it has done 130,000 miles, the box is fine. I have read on some forums where some people say leave it well alone or your have problems and others are saying change it. I would like to change it personally, i can't see the harm, but i would like other views.

Can i hear some views, for or against it and please state your reasons.

Thanks in advance and i will chose a best answer.

Hi,

I want to buy a T sport 1800 cc corolla, i have heard that some of the corolla's have had bore lining issues that burn approx 1 litre of oil over 600 - 1000 miles. Does this affect all the models or just a certain year of build? Does any body have any information on this and give me some details? the year i'm looking to purchase is 03 - 05 plate.

Best answer will be awarded .

Thanks.