tag:blogger.com,1999:blog-1141932539860553199.post3991926838361594061..comments2024-03-05T10:52:24.691+00:00Comments on Mark Wadsworth: Calculating the speed of a falling object etc. using the physics approach.Mark Wadsworthhttp://www.blogger.com/profile/07733511175178098449noreply@blogger.comBlogger16125tag:blogger.com,1999:blog-1141932539860553199.post-44217307913387724032021-11-09T07:54:51.483+00:002021-11-09T07:54:51.483+00:00Thanks Mark!
In fact, it went up to 44.7 mpg yest...Thanks Mark!<br /><br />In fact, it went up to 44.7 mpg yesterday, so as the A21 is renowned for that average speed, I'll rest easier!Scrobs.https://www.blogger.com/profile/12942449871600526680noreply@blogger.comtag:blogger.com,1999:blog-1141932539860553199.post-59587589555369172512021-11-06T07:52:47.273+00:002021-11-06T07:52:47.273+00:00G, my kids are already at uni, so it's a bit l...G, my kids are already at uni, so it's a bit late for that.Mark Wadsworthhttps://www.blogger.com/profile/07733511175178098449noreply@blogger.comtag:blogger.com,1999:blog-1141932539860553199.post-5580572675709237212021-11-05T23:50:53.602+00:002021-11-05T23:50:53.602+00:00Are your kids doing sats, so they need to know the...Are your kids doing sats, so they need to know these shortcuts? Graemehttps://www.blogger.com/profile/11007306140530173428noreply@blogger.comtag:blogger.com,1999:blog-1141932539860553199.post-79506346786796990322021-11-05T11:43:48.110+00:002021-11-05T11:43:48.110+00:00Sc, if feather footing improves mpg by 3%, then it...Sc, if feather footing improves mpg by 3%, then it saves you half a penny a mile (3% of 16). There's no need to be any more scientific than that, because 43, 44.2 and 16 are just mid-point estimates.Mark Wadsworthhttps://www.blogger.com/profile/07733511175178098449noreply@blogger.comtag:blogger.com,1999:blog-1141932539860553199.post-88611314559846119872021-11-05T11:34:22.589+00:002021-11-05T11:34:22.589+00:00I've been looking at two equations just yester...I've been looking at two equations just yesterday!<br /><br />1) What is the percentage increase in cost for an expensive beer from Waitrose, from an expensive beer from Tesco.<br /><br />I tried to do this while driving the car, but had to do a quick spreadsheet when I got home!<br /><br />and...<br /><br />My VW Golf does approximately 43 mpg, but with a bit of 'featherfooting' (it's automatic), I can get it up to 44.2 mpg.<br /><br />How much am I saving on premium petrol, (I do mainly short journeys, and don't use Wynns)! It's currently 16p a mile.<br /><br />Again, I had to do another spreadsheet after failing to solve it in my head!<br /><br />I'm applying for 'Nerd of the year' it seems...<br /><br />Scrobs.https://www.blogger.com/profile/12942449871600526680noreply@blogger.comtag:blogger.com,1999:blog-1141932539860553199.post-66355404394740470582021-11-04T18:39:19.193+00:002021-11-04T18:39:19.193+00:00Dr E, fair point. But I use SI units, so much easi...Dr E, fair point. But I use SI units, so much easier and internationally accepted.Mark Wadsworthhttps://www.blogger.com/profile/07733511175178098449noreply@blogger.comtag:blogger.com,1999:blog-1141932539860553199.post-39249740254049469722021-11-04T18:15:27.992+00:002021-11-04T18:15:27.992+00:0032 feet/sec/sec32 feet/sec/secDr Evilhttps://www.blogger.com/profile/00176521760477086914noreply@blogger.comtag:blogger.com,1999:blog-1141932539860553199.post-24413000732154849992021-11-04T17:10:14.699+00:002021-11-04T17:10:14.699+00:00MW. It's how 'specials' have always b...MW. It's how 'specials' have always been made.Lolahttps://www.blogger.com/profile/04586735342675041312noreply@blogger.comtag:blogger.com,1999:blog-1141932539860553199.post-11212498303058765132021-11-04T16:58:47.494+00:002021-11-04T16:58:47.494+00:00B, I prefer 9.8, give gravity a chance. If you do ...B, I prefer 9.8, give gravity a chance. If you do ten, you might end up with the right answer by mistake because you dropped or added a zero somewhere and also forgot to divide or multiply by g.<br /><br />L, ha! That was a lucky guess on my part.Mark Wadsworthhttps://www.blogger.com/profile/07733511175178098449noreply@blogger.comtag:blogger.com,1999:blog-1141932539860553199.post-71493292923662575422021-11-04T16:39:07.040+00:002021-11-04T16:39:07.040+00:00MW - I meant to say the rear spring damper units o...MW - I meant to say the rear spring damper units on the rear of the car I am re-building are the front units off a Hillman ImpLolahttps://www.blogger.com/profile/04586735342675041312noreply@blogger.comtag:blogger.com,1999:blog-1141932539860553199.post-4446684971850604282021-11-04T15:38:41.724+00:002021-11-04T15:38:41.724+00:00MW Yes! Fr'instance the existing rear spring d...MW Yes! Fr'instance the existing rear spring damper units are off a Hillman Imp...<br /><br />But I am now getting clever and looking at the whole system - try to visualise all the components their locations and how they move. e.g. thew wheel centre line is outboard of the spring centre line by about 6 inches. This creates a lever which makes the spring effectively softer than its actual rate, plus the spring is canted by about 10 degrees. <br /><br />Fun eh?Lolahttps://www.blogger.com/profile/04586735342675041312noreply@blogger.comtag:blogger.com,1999:blog-1141932539860553199.post-7060934485781028172021-11-04T14:45:05.348+00:002021-11-04T14:45:05.348+00:00I have always found that the extra accuracy you ge...I have always found that the extra accuracy you get when you take g to be 9.81 is not worth the extra hassle in calculation over taking g as 10.Bayardhttps://www.blogger.com/profile/15211150959757982948noreply@blogger.comtag:blogger.com,1999:blog-1141932539860553199.post-3804465360975097382021-11-04T12:46:49.049+00:002021-11-04T12:46:49.049+00:00L, do you ever have blinding insights while doing ...L, do you ever have blinding insights while doing so, like "I could take the front springs from car A and use them as rear springs for car B"?Mark Wadsworthhttps://www.blogger.com/profile/07733511175178098449noreply@blogger.comtag:blogger.com,1999:blog-1141932539860553199.post-18385923341996497222021-11-04T12:39:28.909+00:002021-11-04T12:39:28.909+00:00I am so pleased that someone else has the 'bor...I am so pleased that someone else has the 'boring meeting' / 'insomnia' issue. <br /><br />My solutions to the latter are to think through the next stages in the car I am building and how to make the bits and or fit the bits, or to go over economic arguments. As to the former, as I am A Boss I usually just exit, or revert to Plan A - the same as for insomnia. <br /><br />On the maths kick, a few nights I was trying to work out the right spring rates for the car.... Lolahttps://www.blogger.com/profile/04586735342675041312noreply@blogger.comtag:blogger.com,1999:blog-1141932539860553199.post-29155339532401645842021-11-04T12:23:53.566+00:002021-11-04T12:23:53.566+00:00JH, thanks, occasionally I have a lucid moment.JH, thanks, occasionally I have a lucid moment.Mark Wadsworthhttps://www.blogger.com/profile/07733511175178098449noreply@blogger.comtag:blogger.com,1999:blog-1141932539860553199.post-14913735816520140012021-11-04T12:08:29.559+00:002021-11-04T12:08:29.559+00:00Q1: Object is doing 60 m/s when it hits the ground...Q1: Object is doing 60 m/s when it hits the ground. From what height was it dropped?<br /><br />A: Closing KE = 1/2 x 60 x 60 = 1,800<br />∴ Starting PE = 1,800<br />∴ Starting height = 1,800/9.8 = 183 metres<br /><br />Dem lyrics iz pure poetry.James Highamhttps://www.blogger.com/profile/14525082702330365464noreply@blogger.com