Saturday

September 20, 2014

September 20, 2014

Total # Posts: 242

**Math**

Thank you!
*September 7, 2014*

**Math**

a photocopy store advertises the following prices: 5 cents per copy for the first 20 copies, 4 cents per copy for the 21st through 100th copy, and 3 cents per copy after the 100th copy. Let x be the # of copies, and let y = the total cost of the photocopying. find the equation...
*September 7, 2014*

**chemistry**

write a reaction that show solid copper (II) nitrate dissociating.
*March 27, 2014*

**algebra**

Solve the system by graphing. (If the system is inconsistent, enter INCONSISTENT. If the system is dependent, enter DEPENDENT.) 4x + 2y = 12 5x − 4y = 2
*March 12, 2014*

**algebra**

Solve the system by graphing. (If the system is inconsistent, enter INCONSISTENT. If the system is dependent, enter DEPENDENT.) x − y = 2 2x + 3y = 19
*March 12, 2014*

**math**

Vanessa typically works 8 hours per day in a normal 5 day work week. Last week, however, Vanessa had to take 90 minutes off on Tuesday, 45 minutes off on Thursday, and she left two and a half hours early on Friday. How many hours did Vanessa work last week? (A.35 hours 15 ...
*November 24, 2013*

**Math**

Thanks :)
*November 10, 2013*

**Math**

Please help and explain how to solve and graph 4<=2x-8>10 Thanks
*November 10, 2013*

**math**

Thank You :-)
*November 10, 2013*

**math**

Company A rents copiers for a monthly charge of $200 and $0.08 per copy. Company B rent copiers for a monthly charge of $400 and $0.04 per copy. How many copies produce the same bill? The answer I have is 5,0000 is this correct? Thanks
*November 10, 2013*

**trg**

An earth embankment is 27 m long and has a cross-section shown in the diagram. Find the volume of earth needed to build the embankment.
*September 15, 2013*

**trg**

A plane flies in a direction of N70°E for 80 km and then on a bearing of S10°W for 150 km. a How far is the plane from its starting point? b What direction is the plane from its starting point?
*September 15, 2013*

**Calc**

Recall that the average velocity between times t1and t2 is calculated using vave = y(t2) − y(t1)/t2 − t1. We are given that y = 14t − 1.86t^2. Evaluating at t = 1, we have y(1) = 14(1) − 1.86(1)2 = 12.14. Thus, the average velocity between times 1 and 1...
*September 4, 2013*

**Physics**

The electric and magnetic fields of a plane electromagnetic wave are given by the formulas below, where and are both in meters and is in seconds. This wave is traveling through a medium whose index of refraction is 1.3. Reminder: The "x.xxenn t" notation in the sine...
*June 15, 2013*

**Physics**

last ques radially outward both and last ques =0
*June 15, 2013*

**Physics**

A circuit is composed of a capacitor C= 3 micro F, two resistors both with resistance 69 Ohm, an inductor 6.00e-2 H, a switch , and a battery 25 V. The internal resistance of the battery can be ignored . Reminder: The " L=x.xxenn H" notation means " L=x.xx X 10...
*June 15, 2013*

**Physics**

Please give ans for Q5 for values I am getting them last chance please What is the total magnetic flux through the loop (in Tesla m ) when is 62 cm. Include only the magnetic flux associated with the external field (i.e. ignore the flux associated with the magnetic self-field ...
*June 15, 2013*

**Physics**

Please tell ans of any question please Q3 a=0 last part =0
*June 15, 2013*

**Physics**

Anonymous what is t in Q3 b
*June 14, 2013*

**Physics**

Phy thanks for the ans I have ans for Q3 a=0 and last part =0
*June 14, 2013*

**Physics**

robbo ppls tell what are the formulas for which you have posted.
*June 14, 2013*

**Physics**

This wave is traveling through a medium whose index of refraction is 1.3. E= 2.8 xsin(2*π/lamdaz + 1.19e16) t V/m B =B_0sin(2*π/lamdaz + 1.19e16 t) Tesla Please tel ans for this phy.
*June 14, 2013*

**Physics**

All answers should be in degrees. (a) Using the result of Lecture 31 Question 3, and Snell's law, derive and evaluate for the secondary rainbow for the following values of the incidence angle and index of refraction . 1 , 1.4 incorrect 45 , 1.3 incorrect 87 , 1.55 ...
*June 5, 2013*

**fisica**

How to put values
*June 1, 2013*

**Physics**

pls any one
*May 30, 2013*

**Physics**

Pls tell other ans 1,2,4,5,6
*May 30, 2013*

**Physics**

Any one
*May 30, 2013*

**Physics**

hmmmm pls. post ans for this question pls I have got only one chance left. A solenoid has N=1863.0 turns, length d=46 cm , and radius b=0.4 cm, (b<<d) . The solenoid is connected via a switch, S1 , to an ideal voltage source with electromotive force ϵ=3 V and a ...
*May 22, 2013*

**Physics**

hmmmm pls. find ans of the below. An electromagnet has a steel core (κM≈ 2500) with an approximately circular cross sectional area of 5.0 cm2. The radius of the magnet is 10.0 cm; there is a small air gap of only 2.6 mm (see sketch). The current through the magnet&#...
*May 22, 2013*

**Physics**

In Q4 what is Km Is it kM=2500
*May 22, 2013*

**Physics**

Pls. tell what is v and maximum value.
*May 22, 2013*

**interest**

Based on simple interest, find the total amount saved or owed. principal = $1700; rate = 6%; time = 5 years
*May 15, 2013*

**Physics**

Pl tell ans for prob 1 part c case 2 1.6711e8 is showing wrong
*May 11, 2013*

**Physics**

FLU pl tell ans for value t=2.4e-16
*May 11, 2013*

**Physics**

Pls. tell ans of freq in Q1 and part e and g.
*May 11, 2013*

**Physics**

Phy pls. tell ans of Q1 part b wavenumber, part c and e and 3b
*May 11, 2013*

**Physics**

Flu pls. tell ans of Q1 part b wavenumber, part c and e
*May 11, 2013*

**Physics**

Pls tell ans of Q1 b,c,d,e,f,g
*May 11, 2013*

**Physics**

Please tell Q1 e and b.
*May 11, 2013*

**Physics**

I problem ans not coming right.
*May 11, 2013*

**math**

suppose you roll 2 number cubes. what is the probability that the product of the numbers is a multiple of 7
*May 8, 2013*

**Physics**

FLU pl. tell ans for t=2.4e-16
*May 8, 2013*

**Physics**

Pl tell formula for Q6 part b,c and Q8 n=1.45 and alpha=66
*May 8, 2013*

**Physics**

Pls. tell K and w values and ans of Q1 all parts.
*May 8, 2013*

**Physics**

Flu please give answers.
*May 1, 2013*

**Physics**

please tell parts
*May 1, 2013*

**Physics**

Consider the LR circuit. We have R1=9 Ohms, R2=5 Ohms, R3=19 Ohms, V=2 Volts, L=0.09 H. L and R2 are connected in series, Combination of L and R2 in series is connected with R3 in parallel. This whole combination is connected in series with R1 and voltage source and switch. At...
*April 17, 2013*

**Physics**

Please tell RL Circuit I2 I3 for b and c ASAP
*April 9, 2013*

**Physics**

Help
*April 9, 2013*

**Physics**

Please
*April 9, 2013*

**physics**

Help
*April 8, 2013*

**physics**

Yes please Problem 2!
*April 7, 2013*

**Physics**

Please for problem 2
*April 5, 2013*

**Physics**

A circuit consists of 5 resistors and 3 batteries (see diagram); the connecting wires have all a negligible resistance. The values for R1 , R2 , R3 , R4 , and R5 are 14 Ω, 41 Ω, 68 Ω, 83 Ω, and 110 Ωrespectively. The batteries have a negligible ...
*March 13, 2013*

**Physics**

Three conducting straight wires (though insulated from each other) are each 2 m long. They are electrically connected to each other only at their ends points A and B. AB = 2 meter. The wires are cylindrical. One is made of copper, one of aluminum and one of iron. Their radii ...
*March 13, 2013*

**Physics**

Three parallel plate capacitors (C1,C2 and C3 ) are in series with a battery of 100 V. C1=2500 micro Farad; C2=2C1 , C3=3C1 . (a) What is the potential difference over each capacitor and how much charge is on each capacitor? Across C1 :V1 (in Volts) = incorrect Q1 (in C) = ...
*March 13, 2013*

**Physics**

A certain coaxial cable consists of a copper wire, radius a , surrounded by a concentric copper tube of inner radius c . The space between is partially filled (from b out to c ) with material of dielectric constant K. The goal of this problem is to find the capacitance per ...
*March 13, 2013*

**Physics**

Consider a capacitor made of two square plates of side l. The distance between the two plates is d . (a) We insert a dielectric of dielectric constant K>1 and width l a distance x (as in the diagram). What is the total capacitance of this arrangement? Express your answer ...
*March 13, 2013*

**Physics**

A very long cylindrical capacitor consists of two thin hollow conducting cylinders with the same axis of symmetry. The inner cylinder has a radius a, the outer one has a radius b. You may ignore end effects. (a) Fig. 1 (b) Fig. 2 (a) What is the capacitance per unit length? ...
*March 12, 2013*

**Physics**

A capacitor consists of two concentric spherical shells. The outer radius of the inner shell is a=0.43 mm and the inner radius of the outer shell is b=2.2 mm . (a) What is the capacitance C of this capacitor? Express your answer in Farads. incorrect (b) Suppose the Maximum ...
*March 12, 2013*

**Physics**

An electron is projected, with an initial speed of vi=2.06e+05 m/sec, directly towards a proton that is essentially at rest. If the electron is initially a great distance from the proton, at what distance from the proton is its speed instantaneously equal to twice its initial ...
*March 5, 2013*

**Physics**

Two conducting thin hollow cylinders are co-aligned. The inner cylinder has a radius R1 , the outer has a radius R2 . Calculate the electric potential difference V(R2)-V(R1) between the two cylinders. The inner cylinder has a surface charge density of σa=-σ , where...
*March 5, 2013*

**Physics**

Two spherical conductors, A and B , are placed in vacuum. A has a radius rA=25cm and B of rB=35cm. The distance between the centers of the two spheres is d=225 cm. A has a potential of VA =120 Volt and B has a potential of VB = -40 Volt. a. An electron is released with zero ...
*March 5, 2013*

**Physics**

A point-like negatively charged particle of mass m and charge -q is initially released from rest from the point P along the positive z-axis where the magnitude of the electric field is largest. (a) What is the distance from the point P to the origin? Express your answers in ...
*March 5, 2013*

**Physics**

Point charges Q1 ,Q2 , and Q3 reside on three corners of a square with sides of 1m ; the distance from Q2 to P3 is 2m (see diagram). (a) What is the electric potential,V , at P1 ? (Normalize the potential to be zero at infinity and give your answers in Volts). incorrect What ...
*March 5, 2013*

**Physics**

Three infinite uniformly charged thin sheets are shown in the figure below. The sheet on the left at x=-d is charged with charge per unit area of -3σ , The sheet in the middle at x=0 is charged with charge per unit area of +σ , and the sheet on the right at x=d is ...
*March 5, 2013*

**Physics**

An electron of mass me and charge q=-e is injected horizontally midway between two very large oppositely charged plates. The upper plate has a uniform positive charge per unit area +σ and the lower plate has a uniform negative charge per unit area -σ . You may ignore...
*March 5, 2013*

**Physics**

There is a very large horizontal conducting plate in the x-y plane (consider it infinitely large). Its thickness is h . The charge densities on the upper and the lower surfaces are both equal to +σ. The goal of this problem is to find the electric field (magnitude and ...
*February 25, 2013*

**Physics**

There are two conducting concentric hollow spheres of outer radii R2 and R1 ( R2>R1 ). The thickness of the material of both spheres is d . The inner sphere is negatively charged with charge density -σ1, . The larger sphere is positively charged with charge density +&#...
*February 25, 2013*

**Physics**

A charge-Q is located at x=-l/2 and a charge +Q is located at x=l/2 . Thus the separation between the two charges is l . The total electric field on the x axis can be written as E(x)=E(x)d^ (a) What is the direction d^ of the total electric field at any point on the x axis ...
*February 25, 2013*

**Physics**

A flat thin non-conducting ring has an inner radius R1 and an outer radius R2 . The disk is uniformly charged with charge per unit area σ(>0) . (a) What is the electric field at the center, P , of the ring? Express your answer in terms of the following variables, if ...
*February 25, 2013*

**Statistics**

This person is trying to obtain answers unhonorably for questions from the EDX website, class Statistics 2.1X. Please do not offer answers for this person.
*February 25, 2013*

**Staistics**

This person is trying to obtain answers unhonorably for questions from the EDX website, class Statistics 2.1X. Please do not offer answers for this person.
*February 25, 2013*

**Stasistics**

This person is trying to obtain answers unhonorably for questions from the EDX website, class Statistics 2.1X. Please do not offer answers for this person.
*February 25, 2013*

**Statistics**

This person is trying to obtain answers unhonorably for questions from the EDX website, class Statistics 2.1X. Please do not offer answers for this person.
*February 25, 2013*

**Statistics**

This person is trying to obtain answers unhonorably for questions from the EDX website, class Statistics 2.1X. Please do not offer answers for this person.
*February 25, 2013*

**Physics**

There is a very large horizontal conducting plate in the plane (consider it infinitely large). Its thickness is . The charge densities on the upper and the lower surfaces are both equal to . The goal of this problem is to find the electric field (magnitude and direction) at ...
*February 24, 2013*

**Physics**

There are two conducting concentric hollow spheres of outer radii and ( ). The thickness of the material of both spheres is . The inner sphere is negatively charged with charge density . The larger sphere is positively charged with charge density . (a) What is the electric ...
*February 24, 2013*

**Physics**

A charge is located at and a charge is located at . Thus the separation between the two charges is . The total electric field on the axis can be written as (a) What is the direction of the total electric field at any point on the axis where ? (b)What is as a function of for...
*February 24, 2013*

**Physivs**

A flat thin non-conducting ring has an inner radius and an outer radius . The disk is uniformly charged with charge per unit area . (a) What is the electric field at the center, , of the ring? Express your answer in terms of the following variables, if necessary, , , and the ...
*February 24, 2013*

**Physics**

A non-conducting ring of radius with a uniform charge density and a total charge is lying in the - plane, as shown in the figure below. Consider a point P, located at a distance from the center of the ring along its axis of symmetry. (a) What is the direction of the electric ...
*February 24, 2013*

**Physics**

Electric Field of Two Charges : 15.0 points A point charge is located at x=0, and a point charge is placed at on the -axis of a cartesian coordinate system.The goal of this problem is to determine the electric field, , at various points along the -axis. (a)What is (in N/C) ...
*February 24, 2013*

**Physics**

3 equal charges (all +Q) are located at A, B and C. ABC is an equilateral triangle with sides d. Point A is located at (0,0), point B at (d,0), point C at (d/2,d3√/2). Point P is inside the triangle such that AP=BP=CP. What is the electric field at P - we want the ...
*February 23, 2013*

**Physics**

3 equal charges (all +Q) are located at A, B and C. ABC is an equilateral triangle with sides d. Point A is located at (0,0), point B at (d,0), point C at (d/2,d3√/2). Point P is inside the triangle such that AP=BP=CP. What is the electric field at P - we want the ...
*February 23, 2013*

**Physics**

Three charges (q1=1 μC, q2=−2 μC, q3=3 μC) are located at the corners of an equilateral triangle with sides of length one meter. The 3 μC charge is: Repelled by q1 and attracted by q2. Attracted by q1 and repelled by q2. Attracted by both q1 and q2. ...
*February 22, 2013*

**Physics**

Two electrons are separated by 1 meter. What is the ratio of the magnitude of the electric force on one electron and the gravitational force on that electron due to the other electron? The charge of an electron is 1.6×10−19C and its mass is 9.1×10−31kg.
*February 22, 2013*

**Physics**

Two point charges attract each other with an electric force of magnitude F. If one charge is reduced to 1/3 its original value and the distance between the charges is doubled, what is the resulting magnitude of the electric force between them?
*February 3, 2013*

**chemistryy**

A photon interacts with a ground state electron in a hydrogen atom and is absorbed. The electron is ejected from the atom and exhibits a de Broglie wavelength of 4.548 x 10^-10m. Determine the frequency (in hz) of the interacting photon. i got 1.45691908531e-24 but it is wrong :(
*January 12, 2013*

**Chemistry**

please :(
*January 11, 2013*

**Physics**

A 64.4-kg skateboarder starts out with a speed of 2.11 m/s. He does 81.6 J of work on himself by pushing with his feet against the ground. In addition, friction does -289 J of work on him. In both cases, the forces doing the work are non-conservative. The final speed of the ...
*December 5, 2012*

**Physics**

An engine does 15kJ of work while rejecting 37 kJ to the cold reservoir. What is the efficiency of the engine?
*November 22, 2012*

**Physics**

The surface of the Sun is approximately 5700 K and the temperature of the Earth's surface is about 290 K. What total entropy change occurs when 1000 J of heat of energy is transferred from the Sun to the Earth?
*November 19, 2012*

**physics**

a ball is thrown vertically upward from the top of the building with a velocity 10m/s.it reaches the ground in 5 sec.Find the height of the building the ball strikes the ground?
*September 13, 2012*

**trig**

A plane flies in a direction of N70°E for 80 km and then on a bearing of S10°W for 150 km. a How far is the plane from its starting point? b What direction is the plane from its starting point?
*March 18, 2012*

**HELP PHYSICS!!!!**

=0
*February 29, 2012*

**English**

Join The Army
*February 5, 2012*

**psychology**

View the results for a hypothetical psychology test psychology test. Then, create a report with the following: The mean score for each question. The mean score for the entire test. A graph that represents the scores for each question.
*January 22, 2012*

**chemistry**

I need help building a 3d model of the apertame molecule Can you give me the correct angles? Thanks
*December 18, 2011*

**chemistry**

how many kg of chalcopyrite is needed to obtain 500g of pure copper
*November 16, 2011*

**math**

Solve graphically y = 2x - 6 and y = -2x + 10
*November 13, 2011*