Recent content by dimens

so within a pipe. The place with the higher pressure suggests it's going towards that pressure. Low pressure ----> High presure Most definitely. I'll have to read tonight. One week missed in uni and I'm paying for it. Lol

Thanks for the reply. 1. I'll keep this in mind next time. 2. It's highest at the bottom of the water in the bucket. Pressure increases with depth? Thus the water is going down? 3. I've heard of Bernoulli's briefly but not Torricelli's.

Homework Statement See attached. Homework Equations The Attempt at a Solution The first question, I think it's going upwards because the pressure on the bottom is higher, but I'm not sure the relevant equations to help prove it. For the second question I'm also pretty lost.

input rate = output rate + deposition Qin*C[SIZE="1"]0 = Qout * C + Rt C(t) = (Qin*C[SIZE="1"]0 - Rt) / Qout Something like this?

Homework Statement Question 2. Tetraethyl lead was used in early model cars to help reduce engine knocking, boost octane ratings, and help with wear and tear on valveseats within the motor. In Australia, our petrol contained lead between approximately 1950 and 2002. Consider the impact of...

Definitely feeling silly and like I need to polish up my maths skills right now. With my fix up of my units:t = ln(10)/0.3days t = 7.67 days t = x/v x/v=7.67 days x = 7.67 day * (0.5 m/hour * 24 hours/day) x = 7.67 day * (12m/day) x = 92m Cheers, much appreciated and thankyou.

Should they all be in SI units? So seconds?

Thanks for the reply, just realized my original workings are wrong... t = ln(10)/0.3days t = 7.67/days t = x/v x/v=7.67/days x = 7.67/day * (0.5 m/hour * 24 hours/day) x = 7.67/day * (12m/day) x = 92m/day^2??

Really appreciate the help guys, I think I'm almost there. But I'm having trouble with the units, it should only be in meters these give me a weird set of units.

Making a little more sense, but do we substitute values in for potential concentrations? As there's none stated only percentage we want to lose? So we've got 100% initially going into the lake, then 10% in the output. 100pm= 1000ppm * e ^ -(0.30/day*(x*0.5m/hr)

Haven't done calculus for a few years and even still I was pretty pedestrian with it. Referring back to the initial question, does that mean we substitute our own values in and assume? There's no amount given in the original question only a percentage they want reduced.

[a] concentration of substance in a first order reaction r = reaction? ? I'm feeling so dumb and confused right now lol

Reaction constant is the speed of which a reaction creates or reducts? I always thought it was r = k[a]??

Homework Statement Question 1. An industry uses a long drainage ditch to break down their wastes and in particular to remove the odour. The waste travels along the ditch at a velocity of 0.5 m/h. The odour is reduced as a first order reaction with a reaction constant of k=0.30 day-1 The...

Homework Statement Determine the specific weight of water at a pressure of 100 KN/m2 absolute and 10˚C temperature. Homework Equations I was thinking it's p=γh The Attempt at a Solution But there's no height?