Friday

November 28, 2014

November 28, 2014

Total # Posts: 213

**chemistry**

In the sun, nuclear fusion takes place. If the decrease in mass isa 0.006 50g, how much energy is released?
*November 19, 2014*

**Peel Adult Education Centre**

In the sun nuclear fusion takes place. If the decrease in mass is 0.006 50 g, how much energy is released?
*November 19, 2014*

**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*

**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*