Friday

May 27, 2016
Total # Posts: 430

**College Chemistry**

For each trial, enter the amount of heat lost by the calorimeter, qcalorimeter. Be careful of the algebraic sign here and remember that the change in temperature is equal to the final temperature minus the initial temperature. Report your answer using 4 digits. Note, this is 1...
*April 12, 2013*

**ece**

Primary classroom rely more on----------- assessment than do preschool classroom
*April 12, 2013*

**College Chemistry**

For each trial, enter the amount of heat lost by the calorimeter, qcalorimeter. Be careful of the algebraic sign here and remember that the change in temperature is equal to the final temperature minus the initial temperature. Report your answer using 4 digits. Note, this is 1...
*April 9, 2013*

**Math-Statistics**

Assume that 60% of community college students are female. 1) If we pick 10 students at random justify why we can or cannot model this using a normal model. 2) Find the probability that 8 of the 10 students selected are female. 3) Find the probability that 8 of more of the 10 ...
*April 8, 2013*

**Statistics**

A study of two groups of children since early childhood: One group of 62 attended preschool. A control group of 61 children from the same area and similar backgrounds did not attend preschool. Over 10 year period as adults, 38 of the preschool sample and 49 of the control ...
*April 8, 2013*

**Chemistry**

1. Which metal is the most easily oxidized? A.) highly active metal *B.) moderately active metal C.) slightly active metal D.) an inactive metal 2. What happens in a voltaic cell? *A.) Chemical energy is changed to a electrical energy. B.) Electrical energy is changed to ...
*March 27, 2013*

**math**

joe draws a line segment 2 1/4 inches long. then he makes the line segment 1 1/2 inches longer. how long is the line segment now?
*March 21, 2013*

**Physics please help!!**

Assume a circular orbit. If a planet's distance from it star is multiplied by 25 times, then by how many times is its orbital period T multiplied ?
*March 4, 2013*

**Physics please help!!**

A satellite is in a circular orbit very close to the surface of a spherical planet. The period of the orbit is 2.23 hours. What is density of the planet? Assume that the planet has a uniform density.
*March 4, 2013*

**Physics**

I'm Try a But the b is: ((sigma*x)/(2*epsilon_0))*(1/(sqrt(x^2+R_1^2))-1/(sqrt(x^2+R_2^2)))
*February 25, 2013*

**halp!**

what do I use for a and k in this situation? i tried taking the derivative but no answers i come up make sense based on the problem.
*February 24, 2013*

**Calculus**

The number, N, of people who have heard a rumor spread by mass media by time, t, is given by N(t)=a(1−e−kt). There are 6 million people in the population, who hear the rumor eventually. If 5% of them heard it on the first day, find the percentage of the population ...
*February 24, 2013*

**Math**

The number, N, of people who have heard a rumor spread by mass media by time, t, is given by N(t)=a(1−e−kt). There are 6 million people in the population, who hear the rumor eventually. If 5% of them heard it on the first day, find the percentage of the population ...
*February 24, 2013*

**Physics**

(x*Q)/(4*pi*epsilon_0*((R)^2+(x)^2)^(3/2))
*February 21, 2013*

**Physics**

and the 2) (B) is 0.5
*February 21, 2013*

**Physics**

b) 1283994.39504
*February 21, 2013*

**Physics**

c) 46.244
*February 21, 2013*

**Physics**

The First is -7.901. Just this in the moment.
*February 21, 2013*

**Physics**

A 8.38g bullet is fired into a 4.60kg block suspended as in the figure. The bullet stops in the block, which rises 15.0cm above its initial position. Find initial speed of the bullet.
*February 13, 2013*

**haematology**

discuss how the body manages to maintain the cellular components whithin the reference range in an a healthy individual
*February 13, 2013*

**Humanities**

What are peer reviewed articles/journals?
*February 12, 2013*

**algebra**

what is a subponent
*February 10, 2013*

**Chemistry**

well i think it will be 183g
*February 6, 2013*

**algebra**

How do you go about solving for x in x/2 + x/3 > 5 ?
*January 31, 2013*

**AP Chemistry**

In a ﬁt of boredom, a chemistry teaching assistant swallows a small piece of solid dry ice (CO2). The 8.9 g of dry ice are converted very quickly into gas at 311 K. Assuming the TA’s stomach has a volume of 1.5 L, what pressure is exerted on his stomach?
*January 16, 2013*

**math**

if a house square feet is 3,546 sq what is the perimeter of the house
*December 19, 2012*

**trigonometry**

5.Find the complete exact solution of sin x = -√3/2. 10. Solve cos 2x – 3sin x cos 2x = 0 for the principal value(s) to two decimal places. 12. Solve tan^2x + tan x – 1 = 0 for the principal value(s) to two decimal places. 19.Prove that tan^2a – 1 + cos^2a...
*December 16, 2012*

**accounting**

1,200;300
*December 13, 2012*

**geometry**

in DEF, DE=5 and M,D=55. find the nearest tenth
*December 10, 2012*

**chemistry**

please explain How % errors would affected the mass/moles of substances in lab?
*December 9, 2012*

**SCI/275**

Compare and contrast the western world view with the deep ecology world view. Challenge one of the world views presented in Visualizing Environmental Science. Which world view is closest to your own? Why?
*December 6, 2012*

**social studies**

What were the three major cities in the Islamic world?how did each develop and grow to become important?
*December 3, 2012*

**problem solving**

An average-size female spider and a large spider can lay a total of 2100 eggs at one time. the large spider lays 20times the number of eggs as the average-size spider. how many eggs does the average sized spider lay
*November 13, 2012*

**Algebra**

5-(7/6x)> 7 Subtract both sides by 5 -(7/6x) > 7-5 -(7/6x) > 2 Multiple both sides by -(7/6x) < 2-(6/7) (1/x) < -12/7 x < -7/12 Correction
*November 9, 2012*

**Algebra**

5-(7/6x)> 7 Subtract both sides by 5 -(7/6x) > 7-5 -(7/6x) > 2 Multiple both sides by -(7/6x) < 2-(6/7) (1/x) > -12/7 x > -7/12
*November 9, 2012*

**college algebra**

The answer is 3. Since the y = -√(x+2) - 9 (-) means reflect by x-axis -9 means 9 units down +2 means shift left 2 units The sign makes a difference For shift if its negative it shift right and positive left.
*November 9, 2012*

**chem**

why is hydrogen gas placed in the 1A column of the periodic table?
*November 8, 2012*

**math**

Jack and Jill wash a car at the same rate . Working together it takes them an hour and 10 minutes to wash a car. One day jack started washing a car by himself at 2:30 p m. When he was half way done , Jill joined him . What time did they finish washing the car?
*November 7, 2012*

**math**

- Juwan and Jake both have money in their pockets. If Juwan gave Jake 15 cent then they both would have the same amount of money. However, if Jake gave Juwan 15 cent , then Juwan would have 5 times as much money as Jake would have. How much money do Juwan and Jake have ...
*November 7, 2012*

**Math**

17x*3 =75
*October 17, 2012*

**math**

Wat is the number sequence for 16 18 20 22 24 26 28 30 32 34 36 38 40 42
*October 16, 2012*

**math**

i got b. and got it wrong
*October 15, 2012*

**math**

The scatter plot shows the study times and test scores for a number of students. How long did the person who scored 81 study? A. 50 minutes B. 81 minutes C. 16 minutes D. 100 minutes helppppppp!!!!!
*October 15, 2012*

**Math**

Can someone help me with this math problem? 14 divided by 2 1/3
*October 9, 2012*

**Physics**

For mass 1, Set up your x coordinate so that Tension is in the positive, and so that the Force of Friction and the x component of weight is in the negative. No other forces exist in the x. Set up your y coordinate perpendicular to the surface of the ramp. Make the normal force...
*September 26, 2012*

**math**

on the 1st problem i dont understand how x is being added when the sign is subtraction
*September 25, 2012*

**math**

d+3(d-4)=20 please explain
*September 25, 2012*

**math**

x-(12-x)=38 please explain
*September 25, 2012*

**math**

A college bookstore ordered six boxes of red pens. The store sold 32 red pens last week and 35 red pens this week. Five pens were left on the shelf. How many pens were in each box?
*September 24, 2012*

**math**

draw a box-and-whisker plot for the following set of data. 62,76,41,87,60,42,47,69,65.
*July 22, 2012*

**ALGEBRA**

Yolanda is 180 centimeters tall. How many meters tall is that?
*July 2, 2012*

**mechanics**

if a man moves up the escalator and the escalator moves down he has, for example, Vm/g=2stair/s and the escalator has Ve/g =1stair/s, so we have resultant velocity =3stairs/s. Now, assume that as the escalator is not moving man´s Vm/g moving up is 20stairs/s. So the man&...
*July 1, 2012*

**CHEMISTRY**

HOW MANY GRAMS OF ice at 0oc can be melted into water at 0oc by the additon of 75.0 of heat ? hfus = 6.01 kj/mo
*May 31, 2012*

**angular momentum**

a 8.20 kg particle P has a position vector of magnitude 6.90 m and angle θ1 = 42.0° and a velocity vector of magnitude 6.70 m/s and angle θ2 = 25.0°. Force , of magnitude 8.90 N and angle θ3 = 28.0° acts on P. All three vectors lie in the xy plane. ...
*May 30, 2012*

**chemistry**

the volume of a gas is 250 mL at 350 kPa pressure. what will the volume be when the pressure is reduced to 50 kPa, assuming the temperature remains constant?
*May 30, 2012*

**math**

three coins, a half-dollar, quarter, nickel are tossed at the same time. to say that there is an outcome xyz means that the half-dollar, landed x, the quarter landed y, and the nickel landed z. the eight equally likely possibilites can be listed as follows: HHH HHT HTH HTT THH...
*May 14, 2012*

**science-biology**

what do cells do?
*May 12, 2012*

**Psyc Research Methods**

Yes, there is
*May 2, 2012*

**Physics**

The acceleration should come out as 0.1g actually. So, v = sqrt(2*a*s) = sqrt(2*0.1g*1) = 1.40m/s
*April 18, 2012*

**Applied physics**

two men are carrying a 12m uniform ladder on their shoulders. Man A is 1.0m from one end, and man B is 3.0m from the other end. If the beam has a mass of 200kg, determine the load supported by each man.
*March 31, 2012*

**chemistry**

Jessica's teacher has asked her to bring her 0.40 moles of sodium chloride to the laboratory. She should bring approximately _______ grams.
*March 29, 2012*

**Biology**

Spermatozoa and Oocytes... I thnk it should be that..
*March 24, 2012*

**Math**

For a particular mass of gas, the volume (Vcm^3) and pressure (Pcm) of mecury (Hg) are related by P=kV^n, where k and n are constants. Reduce the relation to a linear one and determine the values of k and n given that when v=110cm^3, P=50.3cm and when V=230cm^3, P=18.6cm
*March 24, 2012*

**Math**

For a particular mass of gas, the volume (Vcm^3) and pressure (Pcm) of mecury (Hg) are related by P=kV^n, where k and n are constants. Reduce the relation to a linear one and determine the values of k and n given that when v=110cm^3, P=50.3cm and when V=230cm^3, P=18.6cm
*March 24, 2012*

**Physics**

A car starts from rest and accelerates uniformly to a speed of 50km/h in 18s. If the wheels of the car are 70cm in diameter. Calculate; a.The final angular velocity of the wheels b.angular acceleration
*March 22, 2012*

**Physics**

A mass m=400g hangs from the rim of a wheel of radius r=15cm. When released from rest, the mass falls 2.0m in 6.5sec. Find the moment of inertia of the wheel
*March 21, 2012*

**applied physics**

you are standing on a 100m tall buiding above a street and your friend is standing vertically below the building. When you drop a stone, your friend simultaneously throws the identical stone as yours at a speed of 50m/s in the same straight line. Calculate the time taken for ...
*March 18, 2012*

**Geometry**

A grid shows the positions of a subway stop and your house. The subway stop is located at (7, -6) and your house is located at (-9, 5). What is the distance, to the nearest unit, between your house and the subway stop
*March 14, 2012*

**physics**

a girl lifts a 160-n load a height of 1 m in a time of 0.5 s. what power does the girl produce
*March 14, 2012*

**applied math**

Sorry Orbital speed
*March 13, 2012*

**applied math**

if the mean radius of the moon is 1.73x10^6m and its mass is 7.35x10^22kg.determin the average speed?
*March 13, 2012*

**applied chemistry**

a 69.3g sample of oxalic ac acid, H2C2O4, was dissolved in 1.000L of solution. How would yo prepare 1.00L of 0.150M H2C2O4 from this solution?
*March 8, 2012*

**applied chemistry**

M = 0.0285 mols/0.050 L M = 0.57 mols/L thanks i now know the formular bt hey how would u define Molarity and in what part of living does it apply? Am trying to understand it.
*March 7, 2012*

**applied chemistry**

A 50.0mL volume of AgNO3, solution contains 0.0285 mol AgNO3 (SILVER NITRATE). What is the molarity of the solution?
*March 7, 2012*

**MATH**

So the answer is X=67
*February 20, 2012*

**Math**

Find the volume of the solid generated by revolving the region bounded by y= 5 cosh (x) and y= 5 sinh (x) between x = 0 and x = 1 about the x-axis
*February 10, 2012*

**Language arts and writing **

The first compact microwave ovens were sold in 1960. Everybody didn't use them until the 1980's.
*February 6, 2012*

**chemistry**

Hey, if all hope is lost try this...let me know if it makes sense.... use stoicheometry. (287 amu of Li/ 1 )*( 1 mol/ 6.02 x 10^23) * ( 6.94g Li/ 1 mol) this makes more clearer as fractions on paper....hope this helps. i did this and got 3.31 x 10^-21. (numbers may vary ...
*January 3, 2012*

**Math**

X=x^2+3x-10. Graphed as a parabola Include the x,y table please. And line of symmetry.
*December 7, 2011*

**Math**

4x^2-4 radical3x +3=0 Using quadratic formula
*December 4, 2011*

**physics**

im not even good
*December 3, 2011*

**Math**

9t^2-3t=0. Solve using quadratic formula
*December 1, 2011*

**geometry**

If AC is 50 feet, and AB is 40 feet, which is the length of BC?
*November 29, 2011*

**algebra**

the volume of a cylindrical tank is V(h)= pi(h^3+6h^2+9h) The volume of a tank can be modeled by V(L)= L(L-3.2)(L+6.8)
*November 12, 2011*

**calculus**

Why do we end up with f(x) instead of f(t) on the second fundamental theorem of calculus?
*November 7, 2011*

**calculus**

Why do we end up with f(x) instead of f(t) on the Second Fundamental Theorem of Calculus?
*November 7, 2011*

**algebra**

b) The sales representative later indicates that there are two and one quarter as many homes available with the first floor plan than the second. Write an equation that illustrates this situation. Use the same variables you used in part a. Express the answer with decimal ...
*October 30, 2011*

**Physics**

For mass 1, Set up your x coordinate so that Tension is in the positive, and so that the Force of Friction and the x component of weight is in the negative. No other forces exist in the x. Set up your y coordinate perpendicular to the surface of the ramp. Make the normal force...
*October 12, 2011*

**Physics**

dafuq
*October 1, 2011*

**Physics **

A 61 kg skateboarder wants to just make it to the upper edge of a "quarter pipe", a track that is one-quarter of a circle with a radius of 2.89 m. What speed does he need at the bottom?
*September 29, 2011*

**physics**

A driver traveling at 25 mph in a school zone can brake to an emergency stop in 8 ft. Under similar conditions, what would be the braking distance if the car were traveling at 40 mph?
*September 12, 2011*

**Math**

How to find the missing values 0.38=(3*0.1)+(_*_)
*September 6, 2011*

**verbs**

thanks
*August 2, 2011*

**verbs**

enjoys
*August 2, 2011*

**verbs**

what are the verbs
*August 2, 2011*

**verbs**

kris enjoys action movies at the theatre
*August 2, 2011*

**chemistry**

Calculate the relative molecular mass of a gas if a 500cm3 sample at 20¢ªC and 1 atomic mass of 0.66g
*June 21, 2011*