Wednesday
October 1, 2014

Posts by Sonia


Total # Posts: 211

Trignometry
No, the question is asking to start with 0 and go to q.
May 4, 2014

Trignometry
A calculator is broken so that the only keys that still work are the \sin, \cos, \tan, \cot, \sin^{-1}, \cos^{-1}, and \tan^{-1} buttons. The display initially shows 0. In this problem, we will prove that given any positive rational number q, show that pressing some finite ...
May 4, 2014

malay
How do you respond to these malay questions? Siapakah kawan baik anda di sekolah? Adakah kamu suka akan matapelajaran matematik?Mengapa? Makanan apakah yang paling anda gemari? Adakah anda suka membaca buku novel?
May 1, 2014

English
I mean the right pronounce in US style.
May 1, 2014

English
I think the question is about the pronounce.
May 1, 2014

English
oh,yes.I'm sorry.
May 1, 2014

science
is that electric current occupies space?
May 1, 2014

English
'if it snows tomorrow,I will make a snowman with my family members.
April 23, 2014

English
'if it snows tomorrow,I will make a snowman with my family.
April 23, 2014

Quantum Physics
Suppose that ψ1 and ψ2 satisfy the time independent Schrödinger equation for some potential. Which of the following necessarily also satisfies the Schrödinger equation? Cψ1ψ∗2 aψ1+bψ2 Aψ1/ψ2 Cψ1ψ2 In accorda
October 21, 2013

Quantum Physics
Suppose a particle has wavefunction ψ(x,t=0)=Aexp(−x22l2). What is the average value (expectation value) of p^, ⟨p^⟩, for this state at t=0?
October 21, 2013

Quantum Physics
The variance σ2X=⟨(X^−⟨X^⟩)2⟩ of an operator, X^, is a measure of how large a range its possible values are spread over (the standard deviation is given by σ=σ2−−√). Suppose that |X⟩ is an eigenstate of ...
October 21, 2013

Quantum Physics
What is the probability current density of a particle with wavefunction ψ(x,t)=exp(iℏ(px−Et))?
October 21, 2013

Quantum Physics
Suppose we have a particle in 1-dimension, with wavefunction Ae−|x|2d. What is the probability to find the particle in the interval [0,d]? Please provide your answer in terms of A, d, mathematical constants such as π (entered as pi) or e (entered as e). (Assume that...
October 21, 2013

Quantum Physics
The ground state wavefunction for a particle in a shallow potential well in 1 dimension is of the form: Ae−|x|2d. Given that the particle must be found somewhere in the range x∈[−∞,∞], the born rule then places a constraint on the modulus of A. ...
October 21, 2013

Quantum Physics
Recall how the Schrödinger equation was motivated by the non-relativistic dispersion relation E=p22m. If we follow the same procedure for the case of a relativistic dispersion relation (E2=p2c2+m2c4), what equation do we arrive at? (For simplicity consider the one-...
October 21, 2013

Physics
We are standing at a distance d=15 m away from a house. The house wall is h=6 m high and the roof has an inclination angle β=30 ∘. We throw a stone with initial speed v0=20 m/s at an angle α= 35 ∘. The gravitational acceleration is g=10 m/s2. (See figure...
October 5, 2013

To Reiny, math helper
can you look at my post, its just 4 math terms I need to figure out, please help
September 18, 2013

very EASY Math terms Defintions
OMG THANK YOU !!!!! :):):):):)
September 18, 2013

very EASY Math terms Defintions
Please help someone!!!! a number that can be expressed as the product of 3 equal factors? a number that can be expressed as the product of 2 equal factors product of 1 and a radical product of a rational number and a radical
September 18, 2013

Math term definitions
Please help someone!!!! a number that can be expressed as the product of 3 equal factors? a number that can be expressed as the product of 2 equal factors product of 1 and a radical product of a rational number and a radical
September 18, 2013

Math Definitions
a number that can be expressed as the product of 3 equal factors? a number that can be expressed as the product of 2 equal factors product of 1 and a radical product of a rational number and a radical
September 18, 2013

Math ms sue help
please help me with these defintions of math terms please: a number that can be expressed as the product of 3 equal factors? a number that can be expressed as the product of 2 equal factors product of 1 and a radical product of a rational number and a radical
September 18, 2013

Math definitions
a number that can be expressed as the product of 3 equal factors? a number that can be expressed as the product of 2 equal factors product of 1 and a radical product of a rational number and a radical
September 18, 2013

math
walkie talkie phone company charges $18.00 for basic phone service per month and $0.15 per minute for long distance calls. Arena calls charges $80.00 per month with no fee for long distance calls. For what number of minutes of long distance calls is the cost of walkie talkie ...
August 10, 2013

math
there are 36 carpenters in a crew. on a certain day, 29 were present. what percent showed up for work?
August 10, 2013

math
find the radius and height of a cylindrical soda can with a volume of 21in^3 that minimize the surface area.
April 28, 2013

math
what is the smallest perimeter possible for a rectangle whose area is 1000in^2 and what are its dimensions?
April 28, 2013

math
verify that the function satisfies the hypotheses of the mean values theorem on the given interval. then find all numbers c in the given interval that satisfy the conclusion of the mean value theorem. f(x)=2x/x4 [0,3]
April 28, 2013

calculus
do not get it :(
April 28, 2013

english iii
why did john choose the room in the yellow wallpaper?
March 10, 2013

maths
THE Perimeter of a triangle is 2004. One Side of a triangle = 21 Times the other. the shortest side is integral length. SOLVE For lengths of the sides of the traingle in every possible case.
December 31, 2012

calc
A rectangle is inscribed with its base on the x-axis and its upper corners on the parabola y = 8−x2. What are the dimensions of such a rectangle with the greatest possible area? width= length=
November 21, 2012

calc
Find the point on the line 2 x + 6 y + 2 = 0 which is closest to the point ( 2, 0 ).
November 21, 2012

calculus
A fence 5 feet tall runs parallel to a tall building at a distance of 3 feet from the building. What is the length of the shortest ladder that will reach from the ground over the fence to the wall of the building?
November 21, 2012

calculus
A fence 5 feet tall runs parallel to a tall building at a distance of 3 feet from the building. What is the length of the shortest ladder that will reach from the ground over the fence to the wall of the building?
November 21, 2012

physics
What is the direction of its velocity at this time with respect to the horizontal? Answer between −180 and +180. Answer in units of 
October 25, 2012

physics
A particle has an initial horizontal velocity of 2.9 m/s and an initial upward velocity of 4.5 m/s. It is then given a horizontal accelera- tion of 1.2 m/s2 and a downward acceleration of 1.2 m/s2. What is its speed after 4.9 s? Answer in units of m/s
October 25, 2012

physics
A bomber flies horizontally with a speed of 225 m/s relative to the ground. The altitude of the bomber is 3010 m and the terrain is level. Neglect the effects of air resistance. The acceleration of gravity is 9.8 m/s2 . a) How far from the point vertically un- der the point of...
October 25, 2012

Science- Chemistry
In the standard deviation, the decimal place of the first non-zero digit indicates where the precision of the average ends (decimal place where the individual results deviate from each other). All your mass readings have 5-6 significant figures, so one might expect a standard ...
October 13, 2012

Science- Chemistry
Is this right? 1. Mass of Sample: = (mass of total)- (mass of empty tube) = 25.4886 g - 10.2586 g = 15.2300 g 2. Mass of X recovered: = (mass of filter paper/large watch glass + X) - (mass of filter paper/lg. watch glass) = 23.5899 g - 12.9912 g = 10.5987 g 3. Mass of Y ...
October 13, 2012

Science- Chemistry
A test tube containing a mixture of compounds X, Y, and a small amount of Z weighs 25.4886 g. The tube is emptied into a beaker and the empty tube is reweighed, giving a value of 10.2586 g. The mixture is separated into two components by dissolving in water, filtering off the ...
October 13, 2012

physics
A young woman named Kathy Kool buys a sports car that can accelerate at the rate of 4.16 m/s2. She decides to test the car by drag racing with another speedster, Stan Speedy. Both start from rest, but experienced Stan leaves the starting line 0.58 s before Kathy. Stan moves ...
October 13, 2012

poe
When Maggie applies the brakes of her car, the car slows uniformly from 15.9 m/s to 0 m/s in 2.43 s. How far ahead of a stop sign must she apply her brakes in order to stop at the sign? Answer in units of m
October 7, 2012

PoE
Turner’s treadmill starts with a velocity of −1.9 m/s and speeds up at regular intervals during a half-hour workout.After 36 min, the treadmill has a velocity of −7.6 m/s. What is the average acceleration of the treadmill during this period? Answer in units of...
October 7, 2012

physics
A car starts from rest and travels for 5.9 s with a uniform acceleration of +3.0 m/s2. The driver then applies the brakes, causing a uniform deceleration of 1.3 m/s2. If the brakes are applied for 2.1 s, how fast is the car going at the end of the braking period? Answer in ...
October 7, 2012

introduction to ethics
Virtue ethics regards which of these as virtues? (Points : 1) power envy temperance inconsistency
October 1, 2012

physics
A man jogs at a speed of 1.7 m/s. His dog waits 1.4 s and then takes off running at a speed of 3.4 m/s to catch the man. How far will they have each traveled when the dog catches up with the man? Answer in units of m
September 30, 2012

physics
How long does it take an automobile traveling 64.7 km/h to become even with a car that is traveling in another lane at 53.7 km/h if the cars’ front bumpers are initially 132 m apart? Answer in units of s
September 17, 2012

Literature
If you were simeon, what would you write a a five days journal pertaining to your life?
September 11, 2012

math
the number has 7 digits it is evenly divided by 00 the value of one of the digits is 60,000 the digit in the hundredth place is both even and prime the digit is the thousands place is 1/2 the value of the digit in the ten thousand place the digit in the hundred thousands place...
August 29, 2012

COM/215
REVISE Studying is hard work many students find they study better when they take regular breaks.
August 8, 2012

Statistics
Three cards are drawn with replacement from a standard deck. What is the probability that the first card will be a spade, the second card will be a black card, and the third card will be a queen? Write your answer as a fraction or a decimal number rounded to three decimal places.
June 22, 2012

math
identify the property that it shown. 2*8*5=2*5*8
February 22, 2012

Algebra 1
Can someone tell me the x- and y- intercepts of: x+y=9 Explain how you got the answer please.
February 8, 2012

math
tickets to a school play cost 1.5 in advance and 2.0 at gate. by selling all 200 tickets students got $360. how many tickets did they sell in advance?
January 29, 2012

physics urgent
A 1.5 m tall man stands 2 m in front of a flat wall mirror. Please find: image distance and height of image I have the formulas but i dont know how to solve this without the focal point or a radius...pls help!!!!!!!
December 10, 2011

physics
The magnetic field in the region shown below is increasing by 5 T/s. The circuit shown (with R=25 , C=55 µF, dimensions 1 m by 2 m) is inserted into the region as shown. The capacitor is initially uncharged. 1. How long will it take the capacitor to charge to 25% of its ...
November 12, 2011

physics urgent!
The magnetic field in the region shown below is increasing by 5 T/s. The circuit shown (with R=25 , C=55 µF, dimensions 1 m by 2 m) is inserted into the region as shown. The capacitor is initially uncharged. 1. What is the current in the circuit at the moment the circuit...
November 12, 2011

urgent physics
A power line carries a current of 110 A at a location where the Earth's magnetic field has a magnitude of 0.37 Gauss (0.37·10-4 T) and points due north, very nearly parallel to the ground. Find the direction and magnitude of the magnetic force exerted on a 270 m ...
November 4, 2011

health safety and nutrition of young child
could u please give answers for exam 40553400. i,m not sure about my answers
October 19, 2011

child day care mgmt
today ur going to talk about vitamin c with ur class . from which food group you willl choose ur snack?
October 19, 2011

child care
in preparing budget for a day care center, you must plan for taxes.as an amployer you must pay part of employees which tax
October 18, 2011

biology
hi Granum is a part of chloroplast .these are the stacks of thylakoids please follow the link below to know more
October 3, 2011

physics
Four light bulbs (A, B, C, D) are connected together in a circuit of unknown arrangement. When each bulb is removed one at a time (and subsequently replaced), the following behavior is observed while it is removed: A B C D A rem * on on on B rem on * on off C rem off off * off...
September 30, 2011

physics
A point charge of -8.4 µC is at the origin. a)What is the electric potential due to this charge at (x,y) = (3.5 m, 0 m) b) What is the electric potential due to this charge at (x,y) = (-3.5 m, 0 m) c) What is the electric potential to this charge at (x,y) =(3.5 m, -3.5 m...
September 16, 2011

math
Paul has grades of 73 and 86 on his first two tests. What must he score on his third test in order to have an average of at least 70?
September 6, 2011

statistic
Using the 68-95-99.7 rule: Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the 68-95-99.7 rule to find the following quantities: a. Percentage of scores less than 100 b. Relative frequency of scores less than 120 ...
August 24, 2011

statistic
1. Which of the following statements are correct? a. A normal distribution is any distribution that is not unusual. b. The graph of a normal distribution is bell-shaped. c. If a population has a normal distribution, the mean and the median are not equal. d. The graph of a ...
August 24, 2011

statistic
A data set consist of a set of numerical values. Which if any of the following statements could be correct? a. There is no mode. b. There are two modes. c. There are three modes.
August 21, 2011

Statistic
Indicate whether the given statement could apply to the data set consisting of 1000 values that are all different. 1. The 29% is greater then the 30 th percentile. 2. The median is greater then the first quartile. 3. The third quartile is greater then the first quartile. 4. ...
August 20, 2011

physics
A transformer with 360 turns in its primary coil and 18 turns in its secondary coil is designed to delivered an average power of 1400 W with a maximum voltage of 60 V. What is the maximum current in the primary coil?
August 3, 2011

geometry
Given two spheres, if the volume of the first sphere is 36r, and the volume of the second sphere is 288r, what is the relation of the second radius to the first radius?
August 1, 2011

Pre-algebra
0.2297=(1/x^2-1/49) I don't get how to solve for x. Pls help stuck on a problem
June 19, 2011

alegbra 1
which expression is equal to 6(9+2)?
June 3, 2011

math
write the place name for the 4 in the following number 3 624 786
May 3, 2011

math
thank you so much..
May 3, 2011

math
round the following number to the nearest ten: 53
May 3, 2011

Physics
Let's say I put a very hot 100o C, 41 g cube of aluminum in 71 ml water at room temperature (20o C). What is the temperature of the water after equilibrium occurs
April 25, 2011

Physics
I have been working on this homework question for a bit, but I just can't get it. Please help me! Where must an object be placed with respect to a convex lens (f=20cm) to generate an upright image that is 4 times as large as the object? 10 cm in front 10 cm behind 55 cm in...
April 25, 2011

pre-cal
what is the vertex and directrix of the parabola y=-1/2x^2 + 10 - 46
April 25, 2011

math
find the value of pi in the following: sin pi=cos(pi + 40) sin(80 - pi)=cos pi
April 19, 2011

help please
if you are printing an essay on the comuter....can the essay be double line space?
April 15, 2011

math
12
April 5, 2011

MDM4UO
A teacher provides pizza for his class if they earn an a average on any test the proability of the class getting an A average on one of his test is 8% What is the probability that the class will not earn a pizza for the firt seven tests? Answer is 0.5578
April 3, 2011

Clothing and Textiles
What are thedifferent methods of controlling fullness in a garment. Need pictures
March 28, 2011

Please Please Help-Physics
I am having trouble figuring out this question: Part 1: A long staight wire carries a current due East. This wire creates, at point #1, a magnetic field that is derected at 40 deg below due South. From point #1, the wire is located: 50 deg below due North 50 deg below due ...
March 16, 2011

Physics
I am having trouble figuring out this question: Part 1: A long staight wire carries a current due East. This wire creates, at point #1, a magnetic field that is derected at 40 deg below due South. From point #1, the wire is located: 50 deg below due North 50 deg below due ...
March 16, 2011

Phys 2
I am having trouble figuring out this question: Part 1: A long staight wire carries a current due East. This wire creates, at point #1, a magnetic field that is derected at 40 deg below due South. From point #1, the wire is located: 50 deg below due North 50 deg below due ...
March 16, 2011

Stoichiometry
How man liters of hydrogen should have been collected by reacting .045 grams of magnesium?
March 1, 2011

math
Mathsmate homework sheet is 16 vines and 6 minutes
February 1, 2011

health, safety, and nutrition for the young child
according to leeds, at snack time, chilren should be given how much food for each year of their lives?
January 17, 2011

physics
a piece of iron has a temperature of 18 degrees celsius. A second identical piece of iron is twice as hot. What is the temperature of the second piece of iron? Please explain why.
December 13, 2010

Chem H
How do you write a balanced net ionic equation for the reaction Cr2(SO4)3(aq)+(NH4)2(CO3)(aq)?
December 12, 2010

music
need help in describing a piece of music or a song.
December 2, 2010

computer science
. Investigate the values of  and  such that the system of equations x + y + z = 6 x + 2y + 3z = 10 x + 2y + z = , may have (i) Unique solution
November 16, 2010

physics
i got my data task and i need to now is there a link between the height of the slope and the average speed of the object?
November 6, 2010

English
if there are choices like (minor, major) or (major, minor) (topic, writer and information, topic) then what are the best two choices for this blank in a paragraph the.....details grow out the major details and also give the information about....details.
November 5, 2010

English
in a paragraph......details grow out of the major details and also give information about..... details. what are the best suitable words for these two blanks?
November 5, 2010

math
a dailly farmer produce 50 tons of rice in the first day, 57 tons in the second day, and 64 tons in the third day. the production continue to increase in the same manner up to the 28 day. what is the a) production of the farmer on the 28 day? b) what is the total production of...
November 2, 2010

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