Excess electrons

When an object has excess electrons and is charged where are they? Are some of the molecules of the object given an extra electron? Also when two neutrally charged objects are rubbed together why do they both become charged? I would think that the electrons would prefer to keep both objects neutral.

Excess electrons

Hard Science Fiction

If anyone else here is a fan of hard science fiction, do you have any recommendations? I just read Farside by Ben Bova and I really enjoyed it, so I'd say it's worth a read if you come across it.

Hard Science Fiction

Gravitational Effect of Electromagnetic Radiation

Hello PPer's,



I have been considering the effect to which electromagnetic radiation emitted from stars might play in the gravitational coalescence of galaxies. Surrounding every galaxy there must be a halo of electromagnetic radiation streaming outwards at the speed of light which diminishes...



Gravitational Effect of Electromagnetic Radiation

Gravitational Effect of Electromagnetic Radiation

Proving a transformation is linear

1. The problem statement, all variables and given/known data...



Proving a transformation is linear

Proving a transformation is linear

Transverse Waves

1. The problem statement, all variables and given/known data

8. Four wave functions are given below. Rank them in order of the magnitude of the wave

speeds, from least to greatest.

I. y(x,t) = 5sin(4x − 20t + 4)

II. y(x,t) = 5sin(3x −12t + 5)

III. y(x,t) = 5cos(4x + 24t + 6)

IV. y(x,t)...



Transverse Waves

Transverse Waves

Can force or displacement be negative in the work equation?

I know that work is the "dot product" of force and displacement, but I got a little stuck with this problem:



"Vera is driving her 1000-kg car at a speed of 8m/s. When Vera slams on the brakes, the ground exerts an 8000-N frictional force to bring the car to a stop. Determine the initial kinetic...



Can force or displacement be negative in the work equation?

Can force or displacement be negative in the work equation?

Complex Wave Orientation Correction

The configuration and dimensions of any experiment are important in determining wave amplitudes. Then why are the orientations of complex waves not considered when they are added?



For example in two dimensions;



To find a resulting wave at a point P1 from two paths R1 & R2 we have...



Complex Wave Orientation Correction

Complex Wave Orientation Correction

What might cell membranes look like on Titan?

Life on earth uses water as a solvent, but scientists have long speculated about the possibility of life existing in non-aqueous environments. Titan, Saturn's largest moon, has seas of liquid methane, and scientists at Cornell wanted...



What might cell membranes look like on Titan?

What might cell membranes look like on Titan?

Magnetic Fields / Force / Current

1. The problem statement, all variables and given/known data



A magnetic field of 1.4 T [N] is 4.0 m wide. A very long wire crosses the field.



a) If the current in the wire is 2.0 A [W]. find the magnetic force on the wire. Create a diagram.



b) What will happen to the force on the wire...



Magnetic Fields / Force / Current

Magnetic Fields / Force / Current

Pushing a kid on a swing

My teacher told us to push a kid the highest on a swing, that you want to push on the bottom of the path.

Im not sure why this is the case, obviously you wouldn't want to push against the kid.

But it seems to me that as long as you were pushing on the downward swing it shouldn't matter....



Pushing a kid on a swing

Pushing a kid on a swing

Output waveforms with a clamped capacitor

1. The problem statement, all variables and given/known data



For the circuits shown, each utilizing an ideal diode (or diodes), sketch the output for the input shown. Label the most positive and most negative output levels. Assume ##CR > T##.



The input waveform is given by:...



Output waveforms with a clamped capacitor

Output waveforms with a clamped capacitor

Does anyone own Numerical Methods by Laurene Fausett?

Hi,



I'm asking this because I ordered this book today, but there is a 4-day shipping minimum. I have to do a few problems from this book, and if anyone owns this, is it possible to tell me the problem statements?



Also, if I'm not allowed to ask for this, please let me know.



The problems I...



Does anyone own Numerical Methods by Laurene Fausett?

Does anyone own Numerical Methods by Laurene Fausett?

Today I learned

Every day we learn new things. Sometimes it's just a small fact or realization. No matter how trivial or random, let's start recording our daily lessons.



Please start off with "Today I learned". Keep commentary to a minimum and just LIKE posts. I'll start!



Today I learned that you clean...



Today I learned

Today I learned

Kinetic Theory of Gases Derivation

Hi, I am struggling with a particular point on the derivation of the kinetic theory of gases. Between 5mins and 6mins 30seconds of the video below they discuss how to get a value for the average of the squared velocities of the molecules in the gas. The bit I don't get is why they divide by 'N'...



Kinetic Theory of Gases Derivation

Kinetic Theory of Gases Derivation

Mass of an electron

What are some equations that require the mass of an electron? I'm sure there are thousands, but none spring to mind... Also, is it fair to say that electron mass is an essential quantity in quantum physics?

Mass of an electron

Calculating angle of lean on a motorbike on a banked curve

Hi all,



I was wondering if anyone could help me with calculating the angle of lean on a motorbike on a banked curve (with friction). If possible proofs would be very useful.



Thanks



Lee

Calculating angle of lean on a motorbike on a banked curve

Dividing the CLK frequency by 8

1. The problem statement, all variables and given/known data



The question and provided answer are given:



View attachment 79628



2. Relevant equations





3. The attempt at a solution



I disagree with the answer. Shouldn't there only be three rising edge triggered d...



Dividing the CLK frequency by 8

Dividing the CLK frequency by 8