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how the unknown resistance is measured in a dc potentiometer? — Preceding unsigned comment added by 112.79.43.96 ( talk) 03:47, 9 June 2013 (UTC)
What thing can disrupt a surveillance camera other that an electromagnetic pulse and a fake footage? 76.88.39.179 ( talk) 04:33, 9 June 2013 (UTC)
-- 81.218.91.170 ( talk) 04:52, 12 June 2013 (UTC)
Why all objects in free fall have the same gravitational acceleration “g” when diverse masses (say from lightest to heaviest) require unlike forces to move the same distance and can be inferred in the Newton’s 2nd law of motion which states “The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object” i.e. a= F/m. So my question is when F1=ma=mg=F2 or a=g then why not a=g in the following example?
Example:
An acceleration of 4m/s/s is produced if a net 20N force “F1” is applied to block of mass of 5kg F1=ma; a=F/m=20/5=4m/s/s.
A constant gravitational acceleration of g=9.8 m/s/s is NOT produced by the same magnitude of 20N gravitational force”F2” if acted on free fall mass of 5kg F1 =ma=mg=F2=20=5x9.8 (Not congruent)
Shouldn't F1and F2 be dead on before making substitution/ elimination for a=g? 74.200.19.65 ( talk) 04:33, 9 June 2013 (UTC)Eclectic Eccentric Kamikaze
What type of turtle is this? At first my wife thought it was a Diamondback terrapin but now doesn't know. Bubba73 You talkin' to me? 04:53, 9 June 2013 (UTC)
I bought a cheap Am-Tech soldering gun and broke it by having it on for too long (I subsequently bought a Weller which came with instructions detailing its duty cycle which the cheap gun did not). Here is a photograph of the inside of the broken cheap soldering gun. Does that brown stuff suggest exactly what happened? Can I do anything with that chunk of metal? -- 78.144.192.116 ( talk) 16:30, 9 June 2013 (UTC)
The display on my intercom/video door phone is black and white, flickering and slightly bend (the top is closer to the front/viewer than the lower part of the display). The image is distorted if I move the receiver close to the screen, which I believe indicates that it is distorted by the magnetic field from the receiver. I understand how a regular CRT TV works, but I think the screen is too large (ca. 8 cm diagonal) for the depth (ca. 3 cm) of the device. Also this would not explain why the display is bend. So I was wondering whether in my case the electron beam is running in front of the screen vertically upwards. Since the screen is bend it could still hit different points on the screen requiring very little deflection (which is an advantage) in that direction. Not sure whether there is enough space for coils or condensator plates to achieve deflection in the other direction. So my questions is: Do I have a special type of CRT where the beam is running in front of the screen, or is it something else? bamse ( talk) 20:56, 9 June 2013 (UTC)
What kind of motor oil should i use on my BMW 740i? how do i get a manual for my car? What do i need to look at if the check engine light is on? And how do i open the glove compartment if the key won't work? How do i check the fluids? Are there any good diy fyi faq and how to guides that are free online? And also general owner's maintenance checklist and how to guide and videos? — Preceding unsigned comment added by 66.87.71.250 ( talk) 23:12, 9 June 2013 (UTC)
Too many questions! Let's break it down so that our experts can answer by the numbers:
SteveBaker ( talk) 01:56, 10 June 2013 (UTC)
Science desk | ||
---|---|---|
< June 8 | << May | June | Jul >> | June 10 > |
Welcome to the Wikipedia Science Reference Desk Archives |
---|
The page you are currently viewing is an archive page. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages. |
how the unknown resistance is measured in a dc potentiometer? — Preceding unsigned comment added by 112.79.43.96 ( talk) 03:47, 9 June 2013 (UTC)
What thing can disrupt a surveillance camera other that an electromagnetic pulse and a fake footage? 76.88.39.179 ( talk) 04:33, 9 June 2013 (UTC)
-- 81.218.91.170 ( talk) 04:52, 12 June 2013 (UTC)
Why all objects in free fall have the same gravitational acceleration “g” when diverse masses (say from lightest to heaviest) require unlike forces to move the same distance and can be inferred in the Newton’s 2nd law of motion which states “The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object” i.e. a= F/m. So my question is when F1=ma=mg=F2 or a=g then why not a=g in the following example?
Example:
An acceleration of 4m/s/s is produced if a net 20N force “F1” is applied to block of mass of 5kg F1=ma; a=F/m=20/5=4m/s/s.
A constant gravitational acceleration of g=9.8 m/s/s is NOT produced by the same magnitude of 20N gravitational force”F2” if acted on free fall mass of 5kg F1 =ma=mg=F2=20=5x9.8 (Not congruent)
Shouldn't F1and F2 be dead on before making substitution/ elimination for a=g? 74.200.19.65 ( talk) 04:33, 9 June 2013 (UTC)Eclectic Eccentric Kamikaze
What type of turtle is this? At first my wife thought it was a Diamondback terrapin but now doesn't know. Bubba73 You talkin' to me? 04:53, 9 June 2013 (UTC)
I bought a cheap Am-Tech soldering gun and broke it by having it on for too long (I subsequently bought a Weller which came with instructions detailing its duty cycle which the cheap gun did not). Here is a photograph of the inside of the broken cheap soldering gun. Does that brown stuff suggest exactly what happened? Can I do anything with that chunk of metal? -- 78.144.192.116 ( talk) 16:30, 9 June 2013 (UTC)
The display on my intercom/video door phone is black and white, flickering and slightly bend (the top is closer to the front/viewer than the lower part of the display). The image is distorted if I move the receiver close to the screen, which I believe indicates that it is distorted by the magnetic field from the receiver. I understand how a regular CRT TV works, but I think the screen is too large (ca. 8 cm diagonal) for the depth (ca. 3 cm) of the device. Also this would not explain why the display is bend. So I was wondering whether in my case the electron beam is running in front of the screen vertically upwards. Since the screen is bend it could still hit different points on the screen requiring very little deflection (which is an advantage) in that direction. Not sure whether there is enough space for coils or condensator plates to achieve deflection in the other direction. So my questions is: Do I have a special type of CRT where the beam is running in front of the screen, or is it something else? bamse ( talk) 20:56, 9 June 2013 (UTC)
What kind of motor oil should i use on my BMW 740i? how do i get a manual for my car? What do i need to look at if the check engine light is on? And how do i open the glove compartment if the key won't work? How do i check the fluids? Are there any good diy fyi faq and how to guides that are free online? And also general owner's maintenance checklist and how to guide and videos? — Preceding unsigned comment added by 66.87.71.250 ( talk) 23:12, 9 June 2013 (UTC)
Too many questions! Let's break it down so that our experts can answer by the numbers:
SteveBaker ( talk) 01:56, 10 June 2013 (UTC)