Tuesday

October 21, 2014

October 21, 2014

Total # Posts: 4,200

**Maths**

the ratio of the number of boys to the number of girls in a class is 4:7. if there are 12 more girls than boys, find the total number of pupils in the class.
*September 24, 2014*

**Physics**

A gamma ray with 700KeV energy is Compton-Scattered from an electron. Find the energy of the photon scattered at 110 degrees, the energy of the scattered electron, and the recoil angle of the electron.
*September 24, 2014*

**Physics**

If a 6.0keV photon scatters from a fee proton at rest, what is the change in the photon's wavelength if the photon recoils at 90 degrees?
*September 24, 2014*

**Physics**

White dwarf stars have been observed with a surface temperature as hot as 200,000 degree C. What is the wavelength of the maximum intensity produced by this star?
*September 24, 2014*

**physics**

An airplane with a speed of 53.8 m/s is climbing upward at an angle of 42° with respect to the horizontal. When the plane's altitude is 840 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point of...
*September 24, 2014*

**organic chemistry**

an alkane formula c8h18 can form only three monochlorination products give its structure
*September 23, 2014*

**chemistry**

get to g/cm^3 cm^3=ml 7.89 kg/dm^3 = 7890g/dm^3 = 7.89g/cm^3 = 7.89g/ml so yes the substance will float because its less dense
*September 23, 2014*

**Physics**

A gamma ray with 700KeV energy is Compton-Scattered from an electron. Find the energy of the photon scattered at 110 degrees, the energy of the scattered electron, and the recoil angle of the electron.
*September 23, 2014*

**Physics**

If a 6.0keV photon scatters from a fee proton at rest, what is the change in the photon's wavelength if the photon recoils at 90 degrees?
*September 23, 2014*

**PHYS. (forces)**

gravity is down because gravity slowing down the ball. drag is down because air resistance is slowing the ball down as well.
*September 23, 2014*

**Science**

Which of the following units are in order from smallest to largest? a) Epoch, period, era. b) Era, epoch, period. c) Period, era, epoch. d) Epoch, era, period. True or False? Folding, as well as motion along faults, can change the position of rock layers and how they line up ...
*September 23, 2014*

**Stats**

A trader is designing his investment portfolio. He has prepared a list of potential customers in which to purchase stock. These include 5 companies in Ag, 6 in manufacturing, and 9 in high-tech industry. The trader is going to print this list of companies. If the trader plans ...
*September 22, 2014*

**Chemistry Need help ASAP**

A proposed mechanism for a reaction is: (i) A + B2 = AB2 Ea1 = 12 kJ/mol ƒ´H1 = 3 kJ/mol (ii) AB2 + C2 = ABC + BC Ea2 = 30 kJ/mol ƒ´H2 = 5.2 kJ/mol (iii) ABC + B2 = AB2 + BC Ea3 = 10 kJ/mol ƒ´H3 = -7.8 kJ/mol a) Which is the rate determining ...
*September 21, 2014*

**Chemistry Need help ASAP**

A proposed mechanism for a reaction is: (i) A + B2 = AB2 Ea1 = 12 kJ/mol ƒ´H1 = 3 kJ/mol (ii) AB2 + C2 = ABC + BC Ea2 = 30 kJ/mol ƒ´H2 = 5.2 kJ/mol (iii) ABC + B2 = AB2 + BC Ea3 = 10 kJ/mol ƒ´H3 = -7.8 kJ/mol a) Which is the rate determining ...
*September 21, 2014*

**chemistry**

A proposed mechanism for a reaction is: (i) A + B2 = AB2 Ea1 = 12 kJ/mol ƒ´H1 = 3 kJ/mol (ii) AB2 + C2 = ABC + BC Ea2 = 30 kJ/mol ƒ´H2 = 5.2 kJ/mol (iii) ABC + B2 = AB2 + BC Ea3 = 10 kJ/mol ƒ´H3 = -7.8 kJ/mol a) Which is the rate determining ...
*September 20, 2014*

**Chemistry**

A proposed mechanism for a reaction is: (i) A + B2 = AB2 Ea1 = 12 kJ/mol ƒ´H1 = 3 kJ/mol (ii) AB2 + C2 = ABC + BC Ea2 = 30 kJ/mol ƒ´H2 = 5.2 kJ/mol (iii) ABC + B2 = AB2 + BC Ea3 = 10 kJ/mol ƒ´H3 = -7.8 kJ/mol a) Which is the rate determining ...
*September 20, 2014*

**chemistry**

A proposed mechanism for a reaction is: (i) A + B2 AB2 Ea1 = 12 kJ/mol ƒ´H1 = 3 kJ/mol (ii) AB2 + C2 ABC + BC Ea2 = 30 kJ/mol ƒ´H2 = 5.2 kJ/mol (iii) ABC + B2 AB2 + BC Ea3 = 10 kJ/mol ƒ´H3 = -7.8 kJ/mol a) Which is the rate determining step? ...
*September 20, 2014*

**stats**

Checking the weather. 60% chance of rain at the bears football game. In the past, when it rains, bears win ,44% of the time and when it doesn't rain they lose 27% of the time. What's the probability that at the next game, the bears win in the rain?? Thanks
*September 19, 2014*

**English**

What is the main idea of from the Interesting Life of Olaudah Equiano
*September 18, 2014*

**Chemistry**

1. What does adding a salt like KCL do to the pH of a solution? 2. What does adding a base like KOH do to the pH of a solution
*September 17, 2014*

**Early Childhood Education**

A family-teacher study meeting should NOT include: A. classes on setting up a home library. B. information about the importance of play. C. a “make it/take it” class on homemade reading materials. D. a teacher-parent conference. Would the answer be A. or D.?
*September 17, 2014*

**Early Childhood Education**

That's why I then went with D. which seems like the best answer.
*September 16, 2014*

**Early Childhood Education**

I was thinking that it is either C. or D.
*September 16, 2014*

**Early Childhood Education **

Inventive spellers typically: A. write only words they are certain can be spelled correctly. B. never learn conventional spelling. C. omit consonants in words. D. progress through a series of stages. Is the answer D.?
*September 16, 2014*

**Social Studies**

Oh yeah. I read it wrong, so it's B then since none of the other answers don't make since?
*September 16, 2014*

**Social Studies**

John Locke believed that if government does not protect natural rights, then.. a) Citizens know the government is working because they have safety. b) It breaks the social contract and people can create a new government. c) Citizens should combine the parts of the government ...
*September 16, 2014*

**Social Studies**

I wasn't sure if I was right or not, so thanks! :-)
*September 16, 2014*

**Social Studies**

C?
*September 16, 2014*

**Social Studies**

Imagine your local police arrest a person suspected of robbing many homes and stored. This is an example of how government.. a) abues the power citizens give to it. b) makes laws throught representatives. c) fulfills its promise in the social contract. d) operates by the rule ...
*September 16, 2014*

**statistics**

5. A soft drink dispensing machine uses paper cups that hold a maximum of 12 ounces. The machine is set to dispense a mean of 10 ounces of the drink. The amount that is actually dispensed varies. It is normally distributed with a standard deviation of one ounce. (a) What ...
*September 15, 2014*

**Social Studies**

What did John Locke primarily write about?
*September 15, 2014*

**Science**

Which of the following is the longest divison of the geologic time? a) Period b) Epoch c) Era d) Year I have already looked in my book, I cant figure it out. Can somebody help me?
*September 15, 2014*

**Science**

Where did scientist get information to develop the geologic time scale? a) They collected and studied rock samples in Africa. b) They studied rock layers and index fossils around the world. c) They conducted research at libaries. d) They didn't have any information; they ...
*September 15, 2014*

**Science**

The geologic time scale originally ordered earth's rocks by? a) Absolute age. b) Relative age. c) Composition. d) Decades and centuries.
*September 15, 2014*

**Physics**

An airplane with a speed of 85.4 m/s is climbing upward at an angle of 37.6 ° with respect to the horizontal. When the plane's altitude is 520 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point...
*September 14, 2014*

**Physics**

You are driving a 2530.0-kg car at a constant speed of 14.0 m/s along a wet, but straight, level road. As you approach an intersection, the traffic light turns red. You slam on the brakes. The car's wheels lock, the tires begin skidding, and the car slides to a halt in a ...
*September 13, 2014*

**Chemicals of Life/Chemistry**

Which weighs more: a liter of water at 20 degrees C or a liter of water at 80 degrees C. Explain.
*September 12, 2014*

**computer science**

Using visual logic build a program that asks the user for a whole number, N<100, determine how many quarters, dimes, nickels, and pennies make up N cents with the least amount of coins
*September 12, 2014*

**English-Language**

Please help and correct! 1. Use "in the garage" as an adjective phrase The card in the garage is for you 2. Use "for our English class" as an adverb phrase The paper is due tomorrow for our English class. 3. Use "from an encyclopedia" as an ...
*September 9, 2014*

**maths literacy**

a circular maize field has a radious of 200m.what is the length of the fence around this field?
*September 9, 2014*

**Physics**

Vector A has a magnitude of 13.0 units and points due west. Vector B points due north. (a) what is the magnitude of B if A+B has a magnitude of 16.8 units? (b) What is the direction of A+B relative to due west? (c) What is the magnitude of B if A-B has a magnitude of 16.8 ...
*September 8, 2014*

**WOLRD GEOGRAPHY**

9. Australian vegetation is dominated by various species of acacia and A. cacti. B. marsupials. C. ores. D. eucalyptus. Student Answer: B Answer: Incorrect Reference: 10. According to the World Health Organization (WHO), AIDS is listed as the _______ main cause of global ...
*September 8, 2014*

**WORLD GEOGRAPHY**

9. Australian vegetation is dominated by various species of acacia and A. cacti. B. marsupials. C. ores. D. eucalyptus. 10. According to the World Health Organization (WHO), AIDS is listed as the _______ main cause of global deaths. A. eighth B. fourth C. third D. second 11. ...
*September 7, 2014*

**INTEGRAL CALCULUS PLEASE HELP!!!**

If F(x)dx=1 from 1 to 25, F(x)dx=4 from 1 to 4, and F(x)dx=9 from 17 to 25, then: 1) What does F(x)dx from 9 to 17=? 2) What does (1F(x)-4)dx from 9 to 17x=? I have no idea how to do this problem and have been on it for hours! The problem is not typed incorrectly, this is ...
*September 5, 2014*

**Chemistry**

Draw the isomers for C2h2 Is this correct? CH3-CH=CH-CH3 There's only one possible isomer.
*September 5, 2014*

**Chemistry**

If I count out Avogadro's number if CO2 molecules how much will my piles of molecules weigh? Can someone show me how to get the answer. I know the answer is 44g
*September 4, 2014*

**physics**

a pitched ball is hit by a batter at a 45 degree angle and it just clears the outfield fence, 110m away. If the fence is at the same height as the pitch, find the velocity of the ball when it left the bat. Ignore air resistance.
*September 4, 2014*

**Chemistry**

Thank you so much for helping with this!! Math part if chem is not my strongest :)
*September 3, 2014*

**Chemistry**

Sorry.. What is the density (g/mL)?
*September 3, 2014*

**Chemistry**

A syrup is added to an empty container with a mass of 102.00g . When 0.133 pint of syrup is added, the total mass of the container and syrup is 196.34g . (1 qt = 2 pt)
*September 3, 2014*

**WRITING AND COMMUNICATION**

Another word for a verbal bromide is a A. conceit. B. cliché. C. seltzer. D. euphemism. PLEASE HELP ME I AM BETWEEN B and C
*September 2, 2014*

**Writing Skills**

thank you so much I appreciate it
*September 1, 2014*

**Writing Skills**

5.A 10.A 19.A please check it
*September 1, 2014*

**Writing Skills**

please check it
*September 1, 2014*

**Writing Skills**

1.C 3.A 5.C 6.A 10.D 12.B 15.D 19.C
*September 1, 2014*

**Writing Skills **

1. What do we call an idea that will make the reader take notice and want to read on? A. Card B. Summary C. Hook D. Point of view Student Answer: B Answer: Incorrect Reference: 3. The most important difference between an outline and finished writing is the A. details. B. ...
*September 1, 2014*

**physics**

Suppose a 69-kg boy and a 42-kg girl use a massless rope in a tug-of-war on an icy, resistance-free surface. If the acceleration of the girl toward the boy is 3.0 m/s2, find the magnitude of the acceleration of the boy toward the girl.
*August 30, 2014*

**math**

A flagpole is supported by a wire that is 5m long. The wire is pegged 2.5m from the foot of the pole. Find the height of the pole
*August 23, 2014*

**Geometry**

a carpender is cutting a wooden dowl that is 72 cm long. she wants to cut it into 2 pieces so the 1 piece is 5 times as long as the other. what are the lengths of the 2 pieces?
*August 18, 2014*

**eng 130**

Which statement best illustrate a logical tautology
*August 18, 2014*

**Math- urgent**

A golf ball can travel 170 mph. This is 10/7 times the fastest speed recorded for a hockey puck. What is the record speed for a hockey puck? Make and equation and solve.
*August 6, 2014*

**Biology**

5’-CGCACCTGTGTTGATCACCTAGCCGATCCACGGTGGATCCAAGGC-3’ ||||||||||||||||||||||||||||||||||||||||||||| 3’-GCGTGGACACAACTAGTGGATCGGCTAGGTGCCACCTAGGTTCCG-5’ Tip: If you want to see a review of PCR, we recommend this amazing animation and virtual lab made by the ...
*August 4, 2014*

**public speaking**

1. “To persuade my audience that drinking and driving laws should be stricter” aims for: A. passive agreement with a policy. B. active agreement with a policy. C. personal action to support a policy. D. personal agreement to support a policy.
*July 29, 2014*

**public speaking**

2. “To persuade my classmates that cheating in an exam is just as wrong as plagiarism” is a: A. question of fact. B. question of policy. C. question of value. D. question of guessing.
*July 29, 2014*

**calc 2**

sum ((√(n-1))-(√(n-1)))/n, as n=1
*July 27, 2014*

**calculus 2**

r=1- 3Sin theta¸ find the area enclosed by the inner loop
*July 26, 2014*

**calculus 2**

Evaluate integral x/(1+|x|), (x,-3,3)
*July 26, 2014*

**calculus 2**

find dy/dx and (d^2)y/(d^2)x for x=2sint y=3cost 0<1<2pi
*July 26, 2014*

**calculus 2**

aprox 10.2688 thank you so much
*July 26, 2014*

**calculus 2**

y = ∛x for 1 is less then or equal to x and x is less then 6
*July 26, 2014*

**calculus 2**

use the simpsons rule with n=10, arc length y=^3√x, for 1<=x<6
*July 26, 2014*

**physics**

A single circular loop of wire of radius r = 2.5cm rotates at a frequency of 60 Hz in a constant magnetic field of magnitude B = 1.8 T. Use this to design a generator that produces an induced emf of 430 V. Hint: You must choose values for the number of loops and the area of ...
*July 17, 2014*

**algebra**

at a restaurant brandy paid twice as much as Katie and Katie paid $3 more than Stephanie if the total combined amount they paid was $56 how much did Katie pay
*July 14, 2014*

**Finite Math**

A political scientist has received a grant to fund a research project involving voting trends. The budget of the grant includes $3200 for conducting door-to-door interviews the day before an election. Undergraduate students, graduate students, and faculty members will be hired...
*July 4, 2014*

**Chemistry 1**

In the spectrum of a specific element, there is a line with a wavelength of 486 nm. Use the Rydberg equation to calculate the value of n for the higher energy Bohr orbit involved in the emission of this light. Assume the value for the lower energy orbit equals 2.
*July 1, 2014*

**Chemistry 1**

A dilute solution of hydrochloric acid with a mass of 614.86 g and containing 0.33004 mol of HCl was exactly neutralized in a calorimeter by the sodium hydroxide in 619.41 g of a comparably dilute solution. The temperature increased from 15.529 to 19.691°C. The specific ...
*July 1, 2014*

**Integral question**

1) find the integral from 1to -1 if(5sinx-2tanx+3x^5)dx 2) find the integral of x^3/(x^4+1)dx
*June 26, 2014*

**Derivatives**

Find the derivative of xsecy+y^5=5x^3-7
*June 26, 2014*

**Calc please help**

Find the derivative of f(x) (csc(2x^2+1)^4
*June 26, 2014*

**Calc please help**

That is where I am confused ...
*June 26, 2014*

**Calc please help **

Limit as x approaches zero (1/x-1/tanx)
*June 26, 2014*

**Chemistry**

I need to calculate the mass of CO2 produced in the reaction of NaHCO3 + HCl Data Mass of NaHCO3 = .05g Mass of system before reaction 117.9 g Mass of system after reaction 117l98 Maxium pressure 1.4094 initial pressure 1.0094 pressure change .4 temp 299.2K
*June 24, 2014*

**Stats**

The following data represent the number of live births in the United States in 2007 for women 15 to 49 years old. Age Live Births 15 - 19 445,045 20 - 24 1,082,837 25 - 29 1,208,405 30 - 34 962,179 35 - 39 499,916 40 - 44 105,071 45 - 49 7,349 Find the following: 1. What is ...
*June 16, 2014*

**Math**

Assume that you are drawing two balls without replacement from an urn that contains 13 green balls, 10 blue balls, and 1 red ball. What is the probability that you will draw a blue balls and a red ball?
*June 12, 2014*

**Math please help**

Find the smallest value on function (3/x)+(4/1-x) on interval (0,1)
*June 12, 2014*

**Math please help!**

Find lim as x approaches 0 of (e^x-1-x/2-x^3/6)/(x4)
*June 12, 2014*

**math**

?? but the ans is 0, 72 ,144,216,288,360 degree
*June 12, 2014*

**math**

Solve the equation cos3x=cos2x for 0¡Üx¡Ü360
*June 12, 2014*

**Math please help!!**

Find the derivative of (2^x-e^x)/(2^x+e^x)
*June 11, 2014*

**Math help!**

Find derivative using logarithmic differentiation F(x)= secx^cotx
*June 11, 2014*

**Math help!**

Find the derivative of tan(ln(5x))
*June 11, 2014*

**Math help!**

Find the derivative. F(x)=x^4+x^2+1/(x^2+1)
*June 11, 2014*

**math please help!**

Find the derivative if f(x)= e^-3x times sin(4x) use the product rule.
*June 11, 2014*

**Math- urgent**

Thank you!
*June 10, 2014*

**Math- urgent**

How do you find the sine, cosine, and tangent of a triangle?
*June 10, 2014*

**Microeconomics**

How do costs play into your everyday life? For example, why might it be cheaper to drive on a toll-road vs. a free-access interstate? Also, can you identify situations where you may fall victim to the sunk cost fallacy (we all do)?
*June 10, 2014*

**trig**

A weight attached to a long spring is bouncing up and down. As it bounces, its distance from the floor varies periodically with time. You start a stopwatch. When the stopwatch reads 0.3 seconds, the weight reaches its first high point 65 cm above the ground. The next low point...
*June 9, 2014*

**civics**

WOW im dumb today it must be C?
*June 4, 2014*

**civics **

How is the direct democracy similar to a representative democracy ? A. both types of government are run by a communist party. B.Both types of democracy give power to the elected representative. c.Both types of democracy give power to the elected representative. D. both types ...
*June 4, 2014*

**algebra**

X^9/x^2 H^14/h^5
*June 2, 2014*

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