Most popular questions

84 Why do color TVs make black and white snow? 2020-03-21T11:37:35.150

78 Why do glass windows still exist? (Why haven't they been replaced by plastics?) 2016-02-13T06:20:28.890

53 Why is kVA not the same as kW? 2015-03-02T17:45:28.383

52 Why do cars have mirrors for rear view rather than cameras? 2016-03-16T07:19:14.157

48 How was Volkswagen able to trick the lab pollution test? 2015-09-28T13:58:53.050

48 Are toasters really electrified inside of the "slots"? 2020-07-06T21:05:28.637

44 My customer wants to use my products to do something unsafe. What is my ethical obligation? 2015-04-18T15:17:38.743

43 Is it possible for a bicycle chainwheel to have a fractional number of teeth? 2016-01-25T14:32:16.590

35 What is the purpose of these diversions in a natural gas line? 2015-02-09T22:48:52.813

34 Is it possible to build a perfectly spherical Prince Rupert's drop? 2015-01-21T15:10:36.230

33 Transmitting power over long distances what is better AC or DC? 2018-03-07T12:05:36.320

33 What is the purpose of these “partially filled in” locomotive wheels? 2020-01-04T12:02:26.363

32 Is it possible to "pump" a powder? 2015-01-20T18:35:59.493

32 How fast does solid waste fall in vertical drain pipes? 2015-02-04T12:47:47.763

32 Why dig out and then fill in before building a large structure? 2015-03-06T09:02:15.897

29 What are the pros and cons of a traffic circle versus a traffic light intersection? 2015-01-21T02:42:04.263

28 How to quantify martial arts strikes? 2015-02-20T01:07:56.827

28 Is it possible to build an air compressor with no moving parts? 2015-05-14T16:46:46.883

27 Which is Worse: Car vs. Car or Car vs. Wall? 2015-06-08T23:54:06.047

25 How are increasingly accurate machines made? 2015-07-20T04:43:09.243

24 Why do hydraulic systems use special fluid - what's wrong with water? 2015-01-26T11:41:47.390

24 Calculating pitch, yaw, and roll from mag, acc, and gyro data 2015-06-26T22:43:48.497

24 From an engineering point of view what are the downsides of a too accurate model? 2017-11-29T16:31:22.543

24 Why are engine blocks so robust apart from containing high pressure? 2020-12-08T09:53:22.467

23 Why doesn't a lightning strike destroy the lightning rod? 2015-02-22T19:21:19.357

23 Why don't hydroelectric plants use cascades of turbines instead of single turbines? 2015-02-26T12:17:55.497

23 Why are rear wheels not placed at the extreme rear of a bus? 2015-04-08T21:53:54.640

23 Why would you launch a large ship by dropping it sideways? 2016-02-21T00:46:55.283

23 Why use steam instead of just hot air? 2019-05-08T10:11:53.450

22 How to know whether the flow is supersonic in a nozzle? 2015-01-26T17:56:37.703

22 What is a reason that handlebars fit to a motorcycle and steering wheel fit to a car? 2015-02-08T09:56:35.350

22 Why do car wheels have holes? 2015-05-19T12:02:10.323

22 What is the purpose of these "steps" in rivers? 2015-07-02T20:42:34.323

21 How do engineers really use numerical simulation? 2015-01-24T05:36:09.180

21 How much can Protactinium degrade the efficiency of the Thorium fuel cycle? 2015-02-10T20:21:35.900

20 Sizing a pressure safety valve for two-phase flow 2015-01-25T06:31:07.680

20 Would it make sense to have a 12V lighting circuit in a house? 2015-01-27T03:34:07.273

20 How to make smoke for a small wind tunnel? 2015-02-03T02:48:51.363

20 What makes suspension bridges unsuitable for railways? 2015-02-03T23:43:30.253

20 Does a roadway bridge experience more load when vehicles are parked or when they are moving? 2015-02-17T14:47:53.910

20 Why are earthfills fully covered in concrete where they join bridges? 2015-04-02T12:53:56.237

20 Why do cars turn by turning the front wheel? 2015-08-28T20:52:38.440

20 Why does the Channel Tunnel enter the ground around 10 km from the coast? 2015-12-06T03:14:43.013

20 Why does it take so long to restart a nuclear power plant? 2016-02-12T15:18:07.183

20 Why did steam locomotives not transfer power by cogwheels? 2018-03-01T18:00:08.887

19 Understanding required torque for a motor lifting a weight 2015-05-14T02:56:45.873

19 Why would a train automatically derail if a signal is passed at danger? 2016-06-17T09:33:47.453

19 Windmills in empty fields. Why no trees? 2016-11-23T12:51:59.090

19 What's wrong with transporting a refrigerator on its side? 2017-06-10T21:20:48.730

19 What is the purpose of building foundations? 2019-05-31T10:24:05.113