Physics

Dielectric problem

Dielectric problem

With calcium ion (Ca+2) 6 A (.6nm) from a sulfide ion (S-2)
How much energy do they have to exert to keep the ions in this position? They are working in a vacuum.

Dielectric Constant:
Vaccuum=1
k=1/(4pi e)= 8.99 x 10^9 Nm

emily   4953   7 Replies

chemb

when someone hits you, what do you feel?

when someone hits you, what do you feel?

a force, a momentum, a pressure,...what exactly can you quantify it as?

obama   2632   4 Replies

lgarrison

Time travel?

Time travel?

Is time travel possible? apparently there are NO rules in physics that disprove it, so what do you think about the possibility of it, and also the paradoxes within the universe it may cause?

ruan.mcguinness   3670   5 Replies

biolove

Two concentric, conducting spherical shell are charged as shown in the figure (+

Two concentric, conducting spherical shell are charged as shown in the figure (+

Two concentric, conducting spherical shell are charged as shown in the figure (+Q for the inner shell, +2Q for the outer shell). Using Gauss’s Law and the Charge Conservation principle, determine the charge on:
1)   Surface A (inner surface of the

gerrard   3175   2 Replies

bio_man

Consider the cross section of a current carrying wire as shown below. The curren

Consider the cross section of a current carrying wire as shown below. The curren

Consider the cross section of a current carrying wire as shown below. The current is carried by the 2 gray sections (0<r<a, b<r<c).  The current, i = 10 mA, is in the direction out of the page, half of it flowing in the inner wire an

gerrard   2201   3 Replies

gerrard

A good Physics book

A good Physics book

Hello everyone 

I'm a medical student, & i need to brush up my memory about some essential topics in physics, for example: electricity and magnetism, light and photons, energy, pressure and some pressure units (mmHg, cm H2

Yousef   2222   5 Replies

duddy

Consider the two charges Q1 = 2.0 x 10-7 C, and Q2 = -2.0 x 10-7 C, held 15 cm.

Consider the two charges Q1 = 2.0 x 10-7 C, and Q2 = -2.0 x 10-7 C, held 15 cm.

Consider the two charges Q1 = 2.0 x 10-7 C, and Q2 = -2.0 x 10-7 C, held 15 cm. from each other. Find:
1)   The magnitude of the force between the two charges. [10 marks]
2)   The magnitude and direction of the electric field at point O midway

gerrard   1405   3 Replies

lovon

can any one state how electronic Components (semi conductor) works?

can any one state how electronic Components (semi conductor) works?

I learned physics in 12th.so i've some knowledge about it. I would like to build my one circuit with well  understood basic of semi conductor's. can any one give me what's the idea n how it can b implemented in using wide varities

barathvaj   2052   7 Replies

bio_man

Need help with these!

Need help with these!

1.  Ana-Lucia needs to sink the 8-ball to win a pool match.  She can sink it by hitting the 8-ball so it travels 35° away from the original path of the cue-ball.  At what angle does the cue-ball deflect after hitting the 8-ball? 

gerrard   1156   1 Reply

bio_man

Little Jin rolls his toy car horizontally off the top of a staircase with a speed of 3.0m/s.

Little Jin rolls his toy car horizontally off the top of a staircase with a speed of 3.0m/s.

1.  Little Jin rolls his toy car horizontally off the top of a staircase with a speed of 3.0m/s.  Each of the steps is 0.18 m high and 0.30 m wide.  Which step does the car hit when it lands?

2.  You decide to drive aro

gerrard   1301   1 Reply

duddy

More questions

More questions

1.  A small car uses hydraulic brakes to stop.  This means there is a small piston of 6.0 cm radius located behind the brake pedal that pushes down on an incompressible fluid that is then connected to a 2nd piston of radius 33 cm that opera

gerrard   1339   1 Reply

bio_man

discharging a capaitor

discharging a capaitor

hey guys first time here um the problem states that During a physics demonstration, a fully charged 70-µF capacitor is discharged through a 40-? resistor. How long will it take for the capacitor to lose 62% of its initial energy?

the issu

pradeepbhat92   1548   8 Replies

pradeepbhat92

physics webassign resistors and capacitors

physics webassign resistors and capacitors

For the circuit shown in the figure, determine the charge on each capacitor for the following. (Let R1 = 4 k?, R2 = 5 k?, and Vemf = 15 V.)

(a) switch S has been closed for a long time
Q1    =    
Q2    =    

(b) switch S has

pradeepbhat92   1465   2 Replies

pradeep

why isn't this correct?

why isn't this correct?

These two moons orbit Saturn at 139350 and 141700 , respectively.
Consider the two in a race around Saturn: In one Prometheus orbit, how far behind is Pandora (in units of time)?

I did:
Using Newton's version of Kepler

Sacredmage69   5056   1 Reply

robertling

What book should I use for the SATII in Physics?

What book should I use for the SATII in Physics?

I have to take the SATII in Physics in about a month, and I need the best book possible in order to get a good score. Are there any recommended companies?

alexalexalexw   1000   1 Reply

bio_man

can a coefficient of friction be larger than 1?

can a coefficient of friction be larger than 1?

i've seen all under 1 and greater than 0 only so far.

obama   3609   4 Replies

BearPro

Percent error for physic friction lab

Percent error for physic friction lab

So I am not sure if I can do percent error or not.
We were able to find the static and kinetic friction ,but teacher never gave any theoretical value.
Do i just use static and kinetic friction to find the percent error like use static as ex

boing   2376   1 Reply

jusvsjustin

Three vectors have equal magnitudes and make 120° with each other. We can say th

Three vectors have equal magnitudes and make 120° with each other. We can say th

Three vectors have equal magnitudes and make 120° with each other. We can say that
A) the magnitude of the resultant is one-third the magnitude of the component vectors.
B) the magnitude of the resultant is three times the magnitude of the

ppk   2333   2 Replies

chemb

A boy jumps at a speed of 20.0 m/s at an angle of 25.0° above the horizontal. Wh

A boy jumps at a speed of 20.0 m/s at an angle of 25.0° above the horizontal. Wh

A boy jumps at a speed of 20.0 m/s at an angle of 25.0° above the horizontal. What is the horizontal component of the boy's velocity?
A) 18.1 m/s
B) 15.6 m/s
C) 8.45 m/s
D) 12.6 m/s
E) 9.33 m/s

ppk   9135   2 Replies

chemb

An object is moving with constant non-zero velocity in the +x-axis. The positio

An object is moving with constant non-zero velocity in the +x-axis. The positio

An object is moving with constant non-zero velocity in the +x-axis.  The position versus time graph of this object is
A) a horizontal straight line.
B) a vertical straight line.
C) a straight line making an angle with the time axi

ppk   1464   2 Replies

chemb

If the velocity versus time graph of an object is a horizontal line, the object

If the velocity versus time graph of an object is a horizontal line, the object

If the velocity versus time graph of an object is a horizontal line, the object is
A) moving with constant non-zero speed.
B) moving with constant non-zero acceleration.
C) at rest.
D) moving with infinite speed.
E) none of t

ppk   3426   2 Replies

chemb

A vector is located in the x-y plane. The x- and y-components of this vector are

A vector is located in the x-y plane. The x- and y-components of this vector are

A vector is located in the x-y plane. The x- and y-components of this vector are 4.00 m and 3.00 m, respectively. Find the angle that this vector makes with the positive y-axis.
A) 53.1°
B) 36.9°
C) 126.9°
D) 22.4°
E) 48.6°

ppk   2878   1 Reply

chemb

A boat, whose speed in still water is 1.75 m/s, must aim upstream at an angle of

A boat, whose speed in still water is 1.75 m/s, must aim upstream at an angle of

A boat, whose speed in still water is 1.75 m/s, must aim upstream at an angle of 26.3° (with respect to a line perpendicular to the shore) in order to travel directly across the stream.
(a) Determine the speed of the current.
(b) Determine

ppk   2744   1 Reply

chemb

You are trying to cross a river that flows due south with a strong current. You

You are trying to cross a river that flows due south with a strong current. You

You are trying to cross a river that flows due south with a strong current.  You start out in your motorboat on the  east bank desiring to reach the  west bank directly  west from your starting point.  You should head your mo

ppk   2853   1 Reply

chemb

Which of the following statements is a true statement?

Which of the following statements is a true statement?

Which of the following statements is a true statement?
A) A vector can have positive or negative magnitudes.
B) A vector's magnitude cannot be more than the magnitude of one of its components.
C) A vector's magnitude cannot b

ppk   2316   1 Reply

chemb

Which of the following is a vector quantity?

Which of the following is a vector quantity?

Which of the following is a vector quantity?
A) time
B) mass
C) volume
D) displacement
E) speed

ppk   3265   1 Reply

chemb

Which of the following is a scalar quantity?

Which of the following is a scalar quantity?

Which of the following is a scalar quantity?
A) velocity
B) acceleration
C) displacement
D) mass
E) force

ppk   7099   1 Reply

chemb

A student adds two displacement vectors that have the magnitudes of 12.0 m and

A student adds two displacement vectors that have the magnitudes of 12.0 m and

A student adds two displacement vectors that have the magnitudes of  12.0 m and  5.0 m. What is the range of possible answers for the magnitude of the resultant vector?

ppk   1299   1 Reply

chemb

The area under a curve in a velocity versus time graph gives

The area under a curve in a velocity versus time graph gives

The area under a curve in a velocity versus time graph gives
A) distance traveled.
B) displacement.
C) speed.
D) velocity.
E) acceleration.

ppk   2100   1 Reply

chemb

If the position versus time graph of an object is a horizontal line, the object

If the position versus time graph of an object is a horizontal line, the object

If the position versus time graph of an object is a horizontal line, the object is
A) moving with constant non-zero speed.
B) moving with constant non-zero acceleration.
C) at rest.
D) moving with infinite speed.
E) none of t

ppk   1375   1 Reply

chemb

An object is moving with constant non-zero velocity in the +x-axis. The velocit

An object is moving with constant non-zero velocity in the +x-axis. The velocit

An object is moving with constant non-zero velocity in the +x-axis.  The velocity versus time graph of this object is
A) a horizontal straight line.
B) a vertical straight line.
C) a straight line making an angle with the time axi

ppk   1018   1 Reply

chemb

An object is moving with constant non-zero acceleration in the +x-axis. The pos

An object is moving with constant non-zero acceleration in the +x-axis. The pos

An object is moving with constant non-zero acceleration in the +x-axis.  The position versus time graph of this object is
A) a horizontal straight line.
B) a vertical straight line.
C) a straight line making an angle with the time

ppk   2289   1 Reply

chemb

Car A is traveling at twice the speed of car B. They both hit the brakes at the

Car A is traveling at twice the speed of car B. They both hit the brakes at the

Car A is traveling at twice the speed of car B. They both hit the brakes at the same time and undergo identical decelerations. How does the distance required for car A to stop compare with that for car B?

ppk   1732   1 Reply

chemb

A stone is thrown straight up. What is its acceleration on the way up?

A stone is thrown straight up. What is its acceleration on the way up?

A stone is thrown straight up. What is its acceleration on the way up?

ppk   2062   1 Reply

chemb

Suppose that an object travels from one point in space to another. Make a compa

Suppose that an object travels from one point in space to another. Make a compa

Suppose that an object travels from one point in space to another.  Make a comparison between the displacement and the distance traveled.
A) The displacement is either greater than or equal to the distance traveled.
B) The displacement

ppk   2175   1 Reply

chemb

Which statement below about the distance between the starting and ending positio

Which statement below about the distance between the starting and ending positio

Which statement below about the distance between the starting and ending positions and the displacement between the starting and ending positions is correct?
A) The distance between the starting and ending positions is twice the magnitude of the

ppk   3342   1 Reply

chemb

Classify the given types of matter as either baryonic or nonbaryonic.

Classify the given types of matter as either baryonic or nonbaryonic.

- dark matter consisting of weakly interacting subatomic particles.
- matter that probably makes up the majority of dark matter
- matter in stars
- matter in brown dwarfs
- matter in our bodies
- dark matter consisting of Jup

saurabh10   2529   1 Reply

how_mendel

If the velocity versus time graph of an object is a straight line making an angl

If the velocity versus time graph of an object is a straight line making an angl

If the velocity versus time graph of an object is a straight line making an angle of 30 degrees with the time axis, the object is
A) moving with constant non-zero speed.
B) moving with constant non-zero acceleration.
C) at rest.
D

ppk   1800   2 Replies

mathlover

If the acceleration of an object is always directed perpendicular to its velocit

If the acceleration of an object is always directed perpendicular to its velocit

If the acceleration of an object is always directed perpendicular to its velocity, then
A) the object is speeding up.
B) the object is slowing down.
C) the object is moving with a constant velocity.
D) the object is turning.

ppk   2280   2 Replies

mathlover

how to find all free previous ap test

how to find all free previous ap test

how to find all free previous ap test

michaellol   3800   7 Replies

bio_man