Sunday

October 4, 2015
Total # Posts: 386

**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**

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*

**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*

**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 **

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*

**american history **

Which of the following statements about the Southern planter's world is most accurate?
*June 2, 2011*

**english**

at what point does abigail first began feeling cold?what effect does this event have on danforth?
*May 17, 2011*

**ethics and social responsibilty**

what are some examples,explore the challenges Goodman presents to relativism
*May 9, 2011*

**I need help to unscramble these words in spanish**

Seclaalue
*April 26, 2011*

**Chemistry**

In this experiment the only source of Ca2+ ions is Ca(OH)2. Using the experimental Ksp value, calculate the slubility of Ca(OH)2 (in mol/L) in .30 M NaOH. Experiment Ksp = 1.69x10^-5
*April 24, 2011*

**physics**

For part a) T1 = Upper cord T2 = Lower cord theta = angle between vertical rod and upper cord = arcos(1/1.25) R = radius of circular motion = sqrt((1.25^2) + 1^2) M = mass of object T1sin(theta)+T2sin(theta) = (MV^2)/R Solve for V Turn your V (should be in m/s) into revs/min. ...
*April 21, 2011*

**chem**

How many liters of 12.3 molar NaOH stock solution will be needed to make 12.4 liters of a 1.2 molar NaOH solution? Show the work used to solve this problem.
*April 6, 2011*

**Science**

describe how our solar system formed.
*March 29, 2011*

**Chemistry**

How much water can be produced from the complete reaction of 2.56 L of oxygen gas, at STP, with hydrogen gas answer in units of g.
*March 29, 2011*

**Chemistry**

How much water can be produced from the complete reaction of 2.56 L of oxygen gas, at STP, with hydrogen gas answer in units of g.
*March 29, 2011*

**algebra 1**

Triple a number plus 7 results in 16. What is the number?
*March 29, 2011*

**chemistry**

How many moles of molybdenum are in 1.235 g
*March 3, 2011*

**physics**

In the figure , the total resistance is 10.0 kOmega, and the battery's emf is 28.0 V. If the time constant is measured to be 40.0 mu s. Calculate the total capacitance of the circuit.Calculate the time it takes for the voltage across the resistor to reach 15.0 V after the ...
*March 2, 2011*

**Chemistry**

How many grams of MgCl2 are required to make 350mL of a 0.56M solution of MgCl2?
*February 28, 2011*

**vareiables**

can you help me because i need a good science fair project
*February 24, 2011*

**Algebra**

Evaluate the exprestion: 2(3x+1)/-4 for each value of "x". A.x=9 B.x=2 C.x=-1 D.x=14
*February 17, 2011*

**algebra**

I dont know
*February 13, 2011*

**6th grade science**

true or false. genes are a small section of dna on hromosomes tha have information about a trait.
*February 7, 2011*

**math**

y=-2x+1
*February 3, 2011*

**physics**

A 5.75 µC and a -2.61 µC charge are placed 19.8 cm apart. Where can a third charge be placed so that it experiences no net force?
*January 25, 2011*

**physics**

two point charges have a total charge of 277 µC. When placed 2.00 m apart, the force each exerts on the other is 20.8 N and is repulsive. what are the charges on both?
*January 25, 2011*

**physics**

What is the magnitude of the force a +23 µC charge exerts on a +3.5 mC charge 49 cm away?
*January 25, 2011*

**statistics**

A researcher wants to determine if two brands of cigarettes contain the same amount of nicotine. The data is shown in the table. With a significance level of 0.05 to that conclusion can be reached. Set the interval for a confidence of 95% Sample A: 40.3 37.5 37 41.7 29.8 33.5 ...
*January 23, 2011*

**statistics**

A company is considering installing new machines to assemble its products. The company is considering two types of machines, but it will buy only one type. The company selected eight assembly workers and asked them to use these two types of machines to assemble products. The ...
*January 23, 2011*

**statistics**

A researcher wants to determine if two brands of cigarettes contain the same amount of nicotine. The data is shown in the table. With a significance level of 0.05 to that conclusion can be reached. Set the interval for a confidence of 95% Sample A: 40.3 37.5 37 41.7 29.8 33.5 ...
*January 23, 2011*

**statistic**

A company is considering installing new machines to assemble its products. The company is considering two types of machines, but it will buy only one type. The company selected eight assembly workers and asked them to use these two types of machines to assemble products. The ...
*January 23, 2011*

**calculus**

A cylindrical metal can with an open top is to be constructed. the can must have a capacity of 24pie cubic inches. the metal used to contruct the bottom of the can costs 3 times as much as the metal in the rest of the can. Find the dimensions(radius and height) of the can that...
*January 17, 2011*

**math**

what is the resipical of 9
*January 13, 2011*

**chemistry**

Calculate the temperature change in the water upon complete melting of the ice. Hint: Determine how much heat is absorbed by the melting ice and then use q =mC*Delta T to calculate the temperature change of the 314 g of water. under the following conditions: A 14.7 g ice cube ...
*November 17, 2010*

**chem**

You can use the Density equation: Density=Mass/volume. They give you the volume and density so you need to manipulate the Density equation to solve for mass. That should give you the grams of acetone in the bottle of acetone and you can use that to solve for the acetone ...
*November 15, 2010*

**Chem**

A 12.3 vessel was found to contain N2, Ar He, and He. The total pressure in the vessel was 987 torr and the partial pressures of nitrogen, argon, and helium were 44 torr, 486 torr, and 218 torr, respectively. What was the pressure of neon in the vessel?
*November 11, 2010*

**Math**

If you have 21tiles and there are twice as many blue than red and twice as many red than green how many red green and blue are there.
*November 10, 2010*

**Biology**

When living cells break down food molecules, energy is A)stored as a phosphate group added to ADP. B)stored as ATP. C)released as heat. D)all of the above
*October 28, 2010*

**project management**

How did it contribute to gross underbids and successive cost escalations?
*October 26, 2010*

**chemistry URGENT!**

No you fuc*ing morons...
*October 24, 2010*

**Enaglish**

avoiding predicate subject mismatching how to correct this sentence Measles is where a viral infection causes skin eruptions.
*October 21, 2010*

**6th grade**

how to solve equations containing integers?
*October 19, 2010*

**ALgebra**

use slopes to show that the triangle with vertices (-2,7), (6,9) and (3,4) is a right triangle. write an equation of the line that has y-intercept 5/7 and is parallel to the graph of 6x-3y=1
*October 19, 2010*

**ALgebra**

find an equation of the line containing, (4,-2) and parallel to the line containing (-1,4) and (2,-3) find an equation of the line containing (-1, 3) and perpendicular to the line containing (3,-5) and (-2,7)
*October 19, 2010*

**math**

Tell how you could use line to determine which of two number is greater
*October 18, 2010*

**math**

Write three number that are greater than 1,543,000 but less than 1,544,000
*October 18, 2010*

**algebra**

one plane left an airport at 11:30 am. A second plane, traveling at 320 mph left the same airport at 1:00 pm and overtook the first plane at 4:30 pm. At what speed was the first plane traveling?
*October 17, 2010*