Friday

November 27, 2015
Total # Posts: 88,345

**Physics **

A boat traveling at 9.50 m/s relative to the water aims to go straight across a river. If the river is 106.0 m wide and the current in the river is 3.50 m/s, how far downstream will the boat land on the other side of the river? Calculate the answer in meters (m) and rounded to...
*September 14, 2015*

**Algebra**

Answer to page 204
*September 14, 2015*

**math**

3 1/9;2 5/6;-21/4;1 1/5
*September 13, 2015*

**Chemistry**

Determine the Energy and n(i) for the spectral line at 121.6 nm (orange). Given: spectral line: 121.6 nm n(f) = 1 Find Energy and n(i)
*September 13, 2015*

**Calculus**

How can I show that the function F (x)= the integral from 2x to 5x of 1/ t dt is constant on the interval (0, +∞).
*September 13, 2015*

**calculus**

A rock is thrown upward with a speed of 48 feet per second from the edge of a cliff 400 feet above the ground. What is the speed of the rock when it hits the ground? Use acceleration due to gravity as –32 feet per second squared and approximate your answer to 3 decimal ...
*September 13, 2015*

**physics**

A person travels by car from one city to another. She drives for 21.8 min at 67.1 km/h, 13.1 min at 84.6 km/h, 51.4 min at 33.5 km/h, and spends 11.5 min along the way eating lunch and buying gas. Determine the distance between the cities along this route.
*September 13, 2015*

**Chemistry**

a 7.83g sample of hydrocyanic acid contains 0.290g and 4.06g of nitrogen. Find the mass of carbonin a sample of HCN with a mass of 3.37g.
*September 13, 2015*

**math**

what does scale mean
*September 13, 2015*

**government**

I'm not sure
*September 13, 2015*

**government**

why does a nation's economic status affect its attainment of democracy?
*September 13, 2015*

**Physics**

A 0.0500 kg ice cube at -30.0◦C is placed in 0.400 kg of 35.0◦C water in a very well insulated container. What is the final temperature? (Note: how can you check if all the ice melts at equilibrium temperature?)
*September 13, 2015*

**Physics**

A 0.0500 kg ice cube at -30.0◦C is placed in 0.400 kg of 35.0◦C water in a very well insulated container. What is the final temperature? (Note: how can you check if all the ice melts at equilibrium temperature?)
*September 13, 2015*

**Chemistry (Check)**

Q: Number of unpaired electrons in the nitrogen atom. A: 1s^2 2s^2 2p^6. 3 unpaired electrons in the p orbital Q: Number of 4d orbitals. A: 10 Q: Maximum number of electrons that can have n=3 and l=1. A: 1s^2 2s^2 2p^6 3s^2 3p^6. 2 electrons
*September 13, 2015*

**Chemistry (Check)**

Q: Identify all that is incorrect about the set of four quantum numbers and explain why. {-3, 2, 1, 1/2} A. -3 because there can't be a negative orbital. Q: Identify all that is incorrect about the set of four quantum numbers and explain why. { 3, 2, 1/2, 1/2} A. m(l) = 1/...
*September 13, 2015*

**Chemistry (Check)**

Q: Name the group that has a general electron configuration of ns^2 and provide an example of an atom with this general configuration. A: Alkaline Earth Metals and Beryllium [He] 2s^2 Q: Name the group that has a general electron configuration of ns^2np^6 and provide an ...
*September 13, 2015*

**Physics **

6) A school bus moves at 2.2 m/s as it pulls away from the bus stop what is the speed of the bus 20 s later after its speed has increased by 5.225 m/s? 7) The height of a computer screen is 31.25 cm and its width is 47 cm. a) is the area of the screen known to one, two, three...
*September 13, 2015*

**Chemistry**

Determine the energy and n(i) for the spectral line at 121.6 nm (orange). Hint: R(H)=2.18x10^-18 J, c=3.0x10^8, and 1x10^9 nm - 1 m. Line, nm 121.6 E, J ___ n(f) 1 n(i) ___
*September 13, 2015*

**government**

Are state governments unicameral or bicameral?
*September 13, 2015*

**Chemistry (Check)**

The Lyman series. Of the four lines, 91.2nm, 97.2nm, 102.6 nm, and 121.6nm, which one has the A. Highest wavelength? _____ B. Highest energy? ______ C. Highest frequency?_(1)____ which equals__(2)____ My answers A. 91.2 B. 121.6 C. (1) 121.6 C. (2) energy
*September 13, 2015*

**Maths **

Rearrange in the form ax+by+c=0 1) y=-2x/7 - 6 2) y+4 = 3/5(x-1) Please help Thankyou 😘
*September 13, 2015*

**Physics**

What does the prefix kilo means - kilo meand one thousand or 10^3 How can this prefix be used to modify the description of an obstacle course that is 1450 m long??
*September 13, 2015*

**Physics **

how are the fundamental laws and principles of physics related to the complexity that we see in nature? 2) How do the laws of physics apply to other sciences such ad biology, chemistry, and earth science? Give a specific example to show the connection - is it because there ...
*September 13, 2015*

**math - age problem**

Jill said eight times my age is three years ago equals 104 how old is Jill now
*September 13, 2015*

**Maths**

I just worked out the second answer. I got (X-1)(x+6) Is this also correct?
*September 13, 2015*

**Maths **

Factorise as far as possible: 1) 2a^2b + 8a^2b^2 The answer i got for this is 2ab(a+4ab). I'm not entirely sure if this is fully factorised or not. Can you please correct me if i am wrong. 2) x^2 + 5x - 6 I'm not sure how i can do this. Can someone please explain how ...
*September 13, 2015*

**Difficult algebriac word problem**

The banana
*September 13, 2015*

**mathematics**

find orthogonal trajectory of family of circles x^2+y^2+2fy+1=0.
*September 13, 2015*

**Physics**

A 4000 kg trailer is towed up a hill with a 5% grade. If the towing truck starts from rest at the bottom of the hill and reaches a speed of 12 m/s at the top of the hill, how much is the towing force. The road from the bottom to the top of the hill is straight with a length of...
*September 12, 2015*

**college algebra**

Income=.12*Sales + 11500 m is the slope, in this case .12, x is the amount of sales in dollars
*September 12, 2015*

**pre algebra**

31+0+(-2)
*September 12, 2015*

**Math**

Thanks Damon!! :)
*September 12, 2015*

**Math**

Four members of a club decide to buy shares in a company. They will divide the cost equally. Two new members join the club and agree to contribute to the shares. Their contribution results in a savings of $200 for each of the original four members. How much do the shares cost?
*September 12, 2015*

**science**

mcakcancsajlcnasl
*September 12, 2015*

**science**

lll
*September 12, 2015*

**Duck Ponds High School**

Water pollution
*September 12, 2015*

**accounting**

bought goods on credit from Tom with a list price of 2000, less 10% trade discount
*September 12, 2015*

**music and movement**

It's B.
*September 11, 2015*

**Math**

The firsr answer is 2.917 x 10^2, not 10^3.
*September 11, 2015*

**ENN 103F**

What are two main reasons for a wave of discontent directed at those have represented over decades
*September 11, 2015*

**Math**

Find a negative and a positive coterminal angle for Ө = 2pi/3. -4pi/3 and 8pi/3
*September 11, 2015*

**Calculus**

solve for x: 6x=ex+1
*September 11, 2015*

**Africa Regional Overview**

GREAT RIFT VALLEY
*September 11, 2015*

**Africa Regional Overview**

Which of the following prominent geographic features is located in eastern Africa? A)Sahara Desert B)Kalahari Desert C)Congo D)Great Rift Valley
*September 11, 2015*

**Math**

Since the displacement is in centimeters it probably is positive.
*September 11, 2015*

**Math**

The displacement from equilibrium of an oscillating weight suspended by a spring is given by y(t) = 2 cos 6t, where y is the displacement in centimeters and t is the time in seconds. Find the displacement when t = 1.45, and round your answer to four decimal places if necessary...
*September 11, 2015*

**Health**

I just took the quiz
*September 11, 2015*

**Health**

1-c 2-c 3-true 4-a and c 5-c 6-b 7-d 8-a 9-a 10-d 11-true 12-c 13-true 14-a 15-c
*September 11, 2015*

**Physics**

A treasure map instructs you to walk 27 m south, followed by 70 m east, then 64.5 m north, and finally 28.5 m east. Determine the magnitude of your total displacement, if you follow these instructions. Calculate the answer in meters (m) and rounded to three significant figures.
*September 11, 2015*

**math**

فما هو عرصه مستطيل طوله 16 سم و مساحته 122
*September 11, 2015*

**physics- work **

what is the work required to raise a 10-kg bucket from a well 100-meter deep? Is this right? 10*9.8= 98N 98N*100= 9800J
*September 10, 2015*

**physics**

Which of the following does not involve a force? a.tug of war b.pushing a wagon c.riding a bike d.jumping e.None of the above f.towing a car g.hitting a ball Is the answer e. none of the above? I know a,b,c,d, and g exert a force, but I am not sure about f. towing a car.
*September 10, 2015*

**Math**

Hello I am mother trying to explain to my 13 year-old daughter the result of this equation: 7x^2+7y-4x^2-4y equals to 3x^2-3y I just want to know that I am right since my daughter insists that that was not what the teacher had on the board she got 34y which I told her it is no...
*September 10, 2015*

**Algebra**

1+4n=7-5
*September 10, 2015*

**Math**

The displacement from equilibrium of an oscillating weight suspended by a spring is given by y(t) = 2 cos 6t, where y is the displacement in centimeters and t is the time in seconds. Find the displacement when t = 1.45, and round your answer to four decimal places if necessary...
*September 10, 2015*

**Alegbra**

idk
*September 10, 2015*

**dee**

vertical and horizontal asymptote of arcsin, arccos, and arctan
*September 10, 2015*

**algebra**

Determine the missing coordinate in the ordered pair so that it will satisfy the equation 5x + y = 1.
*September 10, 2015*

**math**

what do you think it is?
*September 10, 2015*

**Math**

(Z-3^2)=(52×4)+(20×26.5)-8
*September 10, 2015*

**math**

I cross multiplied but I used 7/15= b/968 I thought you had to add the ratios or would you only do that if you didn't know the total girls and only knew total students?
*September 10, 2015*

**Physics**

The pressure in the room also increased when the temperature increased, because pressure is ___________ to temperature.
*September 10, 2015*

**kwasa secondary school**

land pollutiom
*September 10, 2015*

**math**

I know the answer is 31. I need an explanation. if you write the number with a hundred place. 031. or 094 000 100. guessing the hundreds place is still zero.
*September 10, 2015*

**kwasa secnotary school**

environmental factors
*September 10, 2015*

**Math**

Cos 30?
*September 10, 2015*

**Math**

Given sin30= 1/2 and cos30= (√3)/2 determine the following - csc30 I see the sin30 part can be used to find the answer, but what about the cos30 part?
*September 10, 2015*

**Algebra 1**

144
*September 10, 2015*

**css**

The height of a triangle is increased by 15% and the base is increased by 10%. Find the increase in its area.
*September 10, 2015*

**Math**

cos(t) = x refers to the x-value found on the unit circle for the corresponding radian measure. So pi/2 has the x value of 0 on the unit circle.
*September 9, 2015*

**Math**

Evaluate the two trigonometric functions using its period as an aid. 1. cos (9pi/2) = ? Ans: 0 2. cos (-9pi/2) = ? Ans: 0 I think they are both 0 because cos(t) = x.
*September 9, 2015*

**Chemistry2**

Chlorine reacts with potassium bromide to produce potassium chlorideChlorine reacts with potassium bromide to produce potassium chloride . .Chlorine reacts with potassium bromide to produce potassium chloride .
*September 9, 2015*

**Chemistry**

How do I calculate the molar mass of the following: Na2SO4.10 H2O(s) CaSO4.2H2O(s)
*September 9, 2015*

**Physics**

jgcuc
*September 9, 2015*

**Physics**

PLEASE help! This is due tomorrow, and I really need to know how to do it. A ball of mass 0.6 kg, initially at rest, is kicked directly toward a fence from a point 20 m away, as shown below. The velocity of the ball as it leaves the kicker’s foot is 18 m/s at angle of 58...
*September 9, 2015*

**math**

the number of fish in each aquarium at a pet store
*September 9, 2015*

**Physics**

Henry, I love you!!!! thank you so so much
*September 9, 2015*

**Physics**

A plane is flying horizontally with speed 193 m/s at a height 2010 m above the ground, when a package is dropped from the plane.The acceleration of gravity is 9.8 m/s^2. 1.What is the horizontal distance from the release point to the impact point? Answer in units of m. 2.A ...
*September 9, 2015*

**Physics**

An object is traveling at a constant speed of 12.0 m/s when it slows to a stop. If it takes 10.0 m for the object to stop, what is the magnitude of its acceleration?
*September 9, 2015*

**Physics**

An object is traveling at a constant speed of 12.0 m/s when it slows to a stop. If it takes 10.0 m for the object to stop, what is the magnitude of its acceleration?
*September 9, 2015*

**Math**

I think it's because I didn't put in the pi correctly.
*September 9, 2015*

**Math**

How do you do the first one on the calculator?
*September 9, 2015*

**Math**

Use a calculator to evaluate the trigonometric function. Round to four decimal places. Make sure that your calculator is in the correct angle mode. 1) csc 2pi/5 1.3213? 2) sec 0.7 1.3075?
*September 9, 2015*

**Pre-Calc**

Find the point (x, y) on the unit circle that corresponds to the real number 5pi/6. Use it to evaluate cos n. Is cos n = (-sqrt(3)/2)?
*September 9, 2015*

**Pre-Calc**

Find the point (x, y) on the unit circle that corresponds to the real number n. n = 5pi/3 (x, y) = ? Is it (1/2, -sqrt3/2)?
*September 9, 2015*

**math **

why can subtraction problems be changed into addition?
*September 9, 2015*

**Pre-Calc**

But isn't cos (pi/2) = 0, because cos(t) = x?
*September 9, 2015*

**Pre-Calc**

Evaluate the two trigonometric functions using its period as an aid. 1. cos (9pi/2) = ? Ans: 0 2. cos (-9pi/2) = ? Ans: 0
*September 9, 2015*

**Pre-Calc**

The displacement from equilibrium of an oscillating weight suspended by a spring and subject to the damping effect of friction is given by y(t) = (1/4)e^-t cos6t, where y is the displacement in feet and t is the time in seconds. Find the displacement when t is equal to 0. ...
*September 9, 2015*

**Social Studies**

The answer was actually D. But thanks for helping! :)
*September 9, 2015*

**Pre-Calc**

Use the value of this trigonometric function to evaluate the indicated function. 1. cos(t) = 3/4 cos(-t) = ? Ans: 3/4 2. sin(-t) = 3/8 sin(t) = ? Ans: -(3/8)
*September 9, 2015*

**statistics**

A study was conducted in which the teachers were asked to rate students for a particular trait on a ten point scale. With the help of data given below. Find out whether significant difference exist in the rating of the student by the teacher. A B C D E F G X 7 3 7 1 5 5 5 Y 5 ...
*September 9, 2015*

**statistics**

A study was conducted in which the teachers were asked to rate students for a particular trait on a ten point scale. With the help of data given below. Find out whether significant difference exist in the rating of the student by the teacher. A B C D E F G X 7 3 7 1 5 5 5 Y 5 ...
*September 9, 2015*

**Intermediate algebra**

How to solve the formula (I=prt for t) for the specified variable
*September 9, 2015*

**maths**

A ladder 6m long is placed against a vertical wall,its lower end is 2m away from the wall. How high up the wall does it reach?give your answer in one decimal place.
*September 9, 2015*