PHYSICS COLLEGE

A nonconducting wall carries a uniform charge density of 10.81 µC/cm2 . What is the electric field 4.8 cm in front of the wall? The permittivity of a vacuum is 8.8542 × 10−12 C 2 /N · m2 . Answer in units of N/C.

Answers

Answer 1
Answer:

To solve this problem it is necessary to apply the concepts related to electric field due to non conducting wall. This is defined as

We have that

is the charge per unit area of the wall and the vacuum permittivity

First we need to convert to SI Units,

Now replacing we have,

Therefore the electric field is


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HIGH SCHOOL

You take an elevator from the ground floor to the top of the empire state building, a building 102 stories high. (a) what is the work done on you by gravity? (assume that your mass is 78 kg and that the height of the empire state building is 300 m.) -229320 correct: your answer is correct. j

Answers

The work done is the change in gravitational potential energy from the bottom to the top.

M g H = (78 kg) (9.81 m/s²) (300 m) = 229,320 joules .

That's the AMOUNT of work done.  Now the question is:  Who or what does the work ?

You have to be lifted against the force of gravity, by something ...
some strong men, an army of hamsters, an electrical elevator, etc.
They have to exert an upward force equal to your weight, and
keep it going until you're 300 meters off of the ground.
Whatever it is that lifts you is what does the work.

Gravity certainly exerts a force on you all the way, but the distance
you move is in the direction OPPOSITE to gravity.  If you want to
calculate the amount of work done by gravity, using the formula

Work = (force) x (distance) ,

then since the force and the distance are in opposite directions,
their signs must be opposite, and you'd have to write

 Work = (m g h) = (78 kg) (9.81 m/s²) (-300m) = -229,320 joules.

The elevator has taken 229,320 joules of energy AWAY from gravity,
and stored it in you.  That's now YOUR gravitational potential energy,
as long as you stay at the top.  If you let go, or jump, or sail away in
a parachute, or come DOWN the stairs, gravity will DO that much 
work on you to bring you down to Earth again. 

HIGH SCHOOL

You are traveling upstream on a river. you see a green square daymark. what should you do

Answers

Upstream or upriver, this is the term used when you are travelling against the direction of flow of river and day marks or day markers are daytime identifiers. 
When you see the green square daymark, you should pass left means keep the mark on your left port side.
Colored marks or other symbols tells us or indicates something, like white with red vertical stripes is a mark that is telling us that the water is safe on all sides.
HIGH SCHOOL

If an electron fell to a lower orbit or energy level, energy would be A. created.
B. emitted.
C. absorbed.
D. transferred.

Answers


The key word here is "fell".  Electrons don't really 'fall', but we
describe the process that way because it's like falling in gravity,
where you lose potential energy.  Similarly, when an electron
transitions to a lower energy level, it has less energy, and the
energy it lost has to go somewhere.  It's emitted from the atom,
in the form of a photon with a frequency that's directly related to
how much energy it's carrying.

HIGH SCHOOL

A jogger runs 4.0 km [W] in 0.50 h, then turns and runs 1.0 km [E] in 0.20 h, then 1.5 km [N] in 0.25 h, then 3.0 km [E] in 0.75 h and finally 1.5 km [S] in 0.30 h.  What is the average velocity?

Answers

This is a sneaky trick question, to help you discover whether you know
one of the differences between velocity and speed.
=======================================
If you make a list of the distances and directions, and ignore the times,
you find these:

4 - west,  (3 + 1) - east . . . . .  zero in the east/west direction

1.5 - north,  1.5 - south . . . . . zero in the north/south direction

This jogger went out, had a nice jog around the neighborhood,and ended up exactly where he started.

Average velocity = (distance between start point and end point) / (time)

IF the question asked for average SPEED, then you would need the total distance, and divide it by the total time.  But it asks for VELOCITY, and that only involves the straight distance between the start point and the end point, regardless of the route taken in between.

The jogger ended up exactly where he started.  The distance between start and end points was zero.  Average velocity is  (zero) / (time) .  And that fraction is going to be Zero, no matter how long or how short the trip was, and no matter how much time it took.


After you draw the displacement vectors you will find the gogger returned to the start location
velocity = (displacement) /  ( t )      >>>>>>>>>>displacement = 0 ( jogger returns to its started point) , t = 0.5 h + 0.2h + 0.25h + 0.75h = 1.7 h
So v = 0/ 1.7 h = 0 
MIDDLE SCHOOL

Mass= 386g volume= 20cm3 what is the density=

Answers

D=m/v
386/20=19.3
The density is 19.3 g/cm^3
The density is 19.3 g/cm3
HIGH SCHOOL

What will be the acceleration of a 40-kilogram object that is pushed with a net force of 80 newtons?

Answers

= 80 N/40 kg
= 2 m/s 2
HIGH SCHOOL

APEX!!!! Impulse experienced by a car (2,00 kg) is 4,000 kg m/s. What is the change in its momentum?

A. 0.50 kg m/s
B. 4,000 kg m/s
C. 2.0 kg m/s
D. 8,000kg m/s

Answers

the answer to your question is D:8,000KG M/S

Answer:

4,000 kg•m/s

Explanation: ap3x

MIDDLE SCHOOL

A person opens a 2-liter bottle of cola at a picnic. If the cap is left off the bottle, the cola will become 'flat' or lose it's carbonation. Which statement below BEST summarizes why the cap must be kept tightly in place if the cola is to remain fresh? A) The cap prevents the liquid in the cola from evaporating.
B) The cap keeps the atmospheric gases and liquid from mixing in the bottle.
C) The cap keeps warm air from entering the two-liter bottle and raising the temperature of the cola solution.
D) The cap keeps the pressure of the gas in the bottle at a high level preventing carbon dioxide from leaving the solution.

Answers

Answer:

Option D

Explanation:

As the question mentions losing its carbonation. Option D is the only option that mentions carbon dioxide gas leaving the solution.

Answer:

Well the is answer is option D

HIGH SCHOOL

What is the speed of a bobsled whose distance time graph indicated that it traveled 103m in 30s?

Answers

v = s/t = (103 m) / (30 s) = 3.433 m/s = 12.36 km/h

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