Tuesday

December 1, 2015
Total # Posts: 477

**Chemistry**

A 0.200 g sample of carbon dioxide, CO2, has a volume of 525 mL and a pressure of 473 mmHg . What is the temperature of the gas in kelvins?
*November 27, 2015*

**Math **

The quotient of two proper fractions is less than 1
*November 19, 2015*

**Calculus **

The volume V of a growing spherical cell is V =4/3πr^3, where the radius is measured in micrometers (1 µm = 10^−6m). Find the average rate of change of V with respect to r when r changes from 3 to each of the following. i)3 to 6µm ii)3 to 4µm
*October 31, 2015*

**physics**

A novice golfer on the green takes three strokes to sink the ball. The successive dis- placements are 7 . 7 m to the north, 1 . 9 m 45 ◦ north of east, and 8 . 7 m 76 ◦ west of south. Starting at the same initial point, an expert (lucky) golfer could make the hole ...
*October 29, 2015*

**physics**

Two identical charges, each -8.00 x 10-5 C, are separated by a distance of 25.0 cm. Find the electric force between them?
*October 26, 2015*

**Calculus **

Differentiate. g(x) = 5e^x√x
*October 4, 2015*

**Vince**

1/wavelength = 1.9678 X 10^7 m^-1 (1/1-1/n^2) 1/9.68 X 10^-8 = 1.09678 X 10^7 m^-1(1-1/n^2) Is this right , how to solve the rest ?
*September 17, 2015*

**Vince**

1/wavelength = 1.9678 X 10^7 m^-1 (1/1-1/n^2) 1/9.68 X 10^-8 = 1.09678 X 10^7 m^-1(1-1/n^2) Is this right , how to solve the rest ?
*September 17, 2015*

**Vince**

Please show work for Determine the final end (final) value of n in a hydrogen atom transition, if electron starts in n = 1 and the atom absorbs a photon of light with an energy of 2.044 X 10^-18J? thank you very much for your help
*September 17, 2015*

**Chemistry**

Noble gases are the least reactive because they have a perfect 8 valence electrons. Or is it because they do not have any unpaired electrons like the rest of the elements.
*July 3, 2015*

**Chemistry**

If I were to explain to someone about how to find a charge of an element, would anyone agree with this: The charge of an element is determined by the gain or lose of electrons. Depending on how close they are to the left/right side of the periodic table concludes their charge...
*July 2, 2015*

**Chemistry Subatomic particles**

Two actually, for the "Data Supporting Discovery,"when it says data, does it mean I have to include a brief explanation about the experiment from the previous group? And for the calculations, is that the "official" way to calculate them, or is there another...
*June 29, 2015*

**Chemistry Subatomic particles**

Fill in the chart (Numbers correspond to each other[I.E 1 in 1st group connects with 1in 2nd]) Subatomic particle found 1.Proton 2.Neutron 3.Electron Scientist 1.Rutherford 2.Chadwick 3.Thomson Experiment 1.Gold Foil Experiment? 2.? 3.Cathode Ray Tube Data Supporting Discovery...
*June 29, 2015*

**Chemistry**

How come lead is denser than copper though more copper atoms can fit into a same size cube than lead atoms can?
*June 29, 2015*

**chimistry**

The molar heat of fusion of lead (Pb) is 1.140 kcal/mol. How much heat must be added to 97.0 g of solid lead at its melting point in order for it to completely melt? A 1.44 kJ B 10.18 kJ C 12.48 kJ D 25.04 kJ
*June 24, 2015*

**math**

v(t) = (5x-75)^2 + 4375 so the lowest value possible for v(t) is 4375 at x=15.
*May 22, 2015*

**Chemistry**

What is the pH, pOH, [H+] and [OH-] for a solution that contains 5.25 x 10^-3 moles of HCl dissolved in 3.25 L of water? I was gone the day my teacher explained this and I'm completely lost on what to do. An outline of steps needed to solve the problem would be helpful. ...
*May 8, 2015*

**math**

The volume inside a rectangular storage room is 2,025 cubic feet. The room is 9 feet high. Find the area of the floor.
*April 28, 2015*

**math**

The area of the base of a rectangular juice box is 4 1/2 square inches. If the volume of the box is 18 cubic inches, how tall is the box?
*April 27, 2015*

**Physics**

An object with a net charge of 20 µC is placed in a uniform electric field of 627 N/C, directed vertically. What is the mass of the object if it floats in the electric field?
*April 20, 2015*

**Calculus**

The management of the UNICO department store has decided to enclose an 870 ft2 area outside the building for displaying potted plants and flowers. One side will be formed by the external wall of the store, two sides will be constructed of pine boards, and the fourth side will ...
*April 13, 2015*

**Physics**

A 4.12 kg mass undergoes an acceleration along both the x and y directions. Ax = -2.60 m/s2 and Ay = 3.50 m/s2. Find the magnitude of the resultant force. Answer in units of N.
*March 2, 2015*

**Business Math**

Newcastle auto plc has a current cash flow of 4.4 million and pays no dividends. The Present value of the company ´s future cash flows is 74 million. The company is entirely financed with equity and has 800.000 shares outstanding. Assume the dividend tax is zero. ...
*February 9, 2015*

**Corporate Finance**

Newcastle auto plc has a current cash flow of 4.4 million and pays no dividends. The Present value of the company ´s future cash flows is 74 million. The company is entirely financed with equity and has 800.000 shares outstanding. Assume the dividend tax is zero. ...
*February 9, 2015*

**math**

jeff has a big scoop of ice cream that is 10 inches tall it melts by 25% in a minute whats the height of the ice cream after one minute
*February 8, 2015*

**math **

jeff has a big scoop of ice cream that is 10 inches tall. it melts by 25%in a minute.whats the height of the ice cream after one minute
*February 8, 2015*

**Math 120**

Write 4logb(X)-1/3logb(y)+2logb(z)as a single logarithm Its log base b.
*December 3, 2014*

**Chem**

The acidic H is almost always attached to an Oxygen Why is that?
*December 1, 2014*

**Physics**

Is the answer 1.67
*November 14, 2014*

**Physics**

The graph shows the temperature versus time relationship for 2kg of particular substance. The substance is in the solid state at a temperature of 20 degrees Celsius b) If 200 joules of heat is added during the time interval B(20 degrees Celsius) to C(80 degrees Celsius), what ...
*November 14, 2014*

**Physics**

The graph shows the temperature versus time relationship for 2 kg of particular substance. The substance is in the solid state at a room temperature of 20 degrees Celsius. - The 100 joules of heat is needed to completely change the substance from a solid to a liquid state, ...
*November 14, 2014*

**Chemistry 400/ Chem 1A**

Assuming that the resolution of an electron microscope is equal to the deBroglie wavelength of the electrons used, what is the resolution of an electron microscope (in nm) when the electrons are accelerated to a speed of (5.60x10^5) m/s?
*October 29, 2014*

**Principles of Accounting**

Exercise 5-3 Analyzing and recording merchandise transactions-both buyer and seller LO P1, P2 Santa Fe Company purchased merchandise for resale from Mesa Company with an invoice price of $26,300 and credit terms of 2/10, n/60. The merchandise had cost Mesa $17,937. Santa Fe ...
*October 22, 2014*

**NH4NO3 explosive?**

Ammonia is used in its anhydrous form gas and the nitric acid is concentrated. This reaction is violent owing to its high exothermic nature.
*October 6, 2014*

**NH4NO3 explosive?**

Yes it is. it is used at mining
*October 6, 2014*

**Calculus**

A light is hung 15 ft above a straight horizontal path. If a man 6 ft tall is walking away from the light at the rate of 5 ft/sec, how fast is his shadow lengthening and at what rate is the tip of the man’s shadow moving?
*October 6, 2014*

**Chem 400**

Direct reaction of solid iodine (I2) and gaseous chlorine (Cl2) produces an iodine chloride,(IxCly), a bright yellow solid. 0.678 g of iodine (I2) is mixed with 0.851 g of chlorine (Cl2). After the elements react, some chlorine is left over along with a single compound that ...
*October 1, 2014*

**Chemistry**

M1V1=M2V2 so 0.1 M x 1.5 L= 2.52 x ?L ?L of 2.52 M stock solution= 0.05 L To find out how much water you need to add just subtract 1.5 L of original solution from 0.05 L. so 1.5 L - .05 L = amount of water in L then just convert you answers to mL.
*October 1, 2014*

**Chem 400**

What about microliter conversion to ml?
*October 1, 2014*

**Chem 400**

A 55 uL of hexane is injected in a mass spectrometer. how many protons are in the 55 uL injection? (density Hexane= 0.6548 g/mL)
*October 1, 2014*

**Chemistry**

Yeh its 14.9 lb/in^2
*September 24, 2014*

**Chemistry**

Assume that the width of your body (across your shoulders) is 50.8 cm inches and the depth of your body (chest to back) is 25.0 cm. If the atmospheric pressure is 14.9lb/in^2, what mass of air (lb) does your body support when you are in an upright position?
*September 24, 2014*

**Chemistry 400/ Chem 1A**

I got 4.854 g of H2SO4. Thank you so much. I did it right the first time just has trouble understanding the problem in my head. To find grams of excess reactant I just have to convert moles of ethanol to g right?
*September 15, 2014*

**Chemistry 400/ Chem 1A**

A chemist mixes 5.216 g of potassium permanganate, 2.318 g of ethanol, and excess sulfuric acid. These chemicals react as follows: 4 KMnO4 + 5 C2H5OH + 6 H2SO4 ---> 4 MnSO4 + 5 CH3COOH + 2 K2SO4 + 11 H20 What mass of sulfuric acid is consumed in this reaction, assuming that...
*September 15, 2014*

**physics, math**

Part A & B are 0.10m apart. A point charge of +3.0*10^-9C is placed at A and a point charge of +1.0*10^-9C is placed at B. X is a point on the straight line through A and B. If a third charge C or charge 1.5*10^-9 is placed at X, where must X be for the resultant force to be ...
*September 14, 2014*

**algebra**

1. x=Y/2+3 2. y= -y/2 - 1/3
*August 21, 2014*

**Math Question**

Five students measure their height using different units. Andrew is 176 cm, Brittney is 5'4", Calvin is 1.8 yards, Don is 54 inches, and Elisha is 1.6 metres. Arrange the students from shortest to tallest. I don't know how to deal with different units! A truck ...
*July 18, 2014*

**science**

A force of 20 n gives a ball an acceleration of 4.0 m/s3 on a lever frictionless surface. what is the mass of the ball?
*June 17, 2014*

**Physics**

A 250g wood block firmly attached to a horizontal spring slides along a table with a coefficient of friction of 0.40. A force of 30.N compresses the spring 20cm. If the spring is released from this position what will be the block's speed when it passes equilibrium position?
*June 4, 2014*

**physics**

help?
*May 15, 2014*

**social studies PLEASE CHECK**

3. is B
*May 6, 2014*

**sitcom analysis**

raising hope: what does jimmy see in sabrina?
*April 24, 2014*

**sitcom analysis**

why does jimmy feel his relationship is doomed? raising hope:
*April 24, 2014*

**statistics**

only be is right! the other parts are wrong
*April 15, 2014*

**Precalculus**

The height (in centimeters) of a candle is a linear function of the amount of time (in hours) it has been burning. When graphed, the function gives a line with a slope of -0.4 . Suppose that the height of the candle after 13 hours is 24.8 centimeters. What was the height of ...
*March 24, 2014*

**trig**

Find csc(theta), tan (theta), and cos (theta), where theta is the angle shown in the figure. Give exact values, not decimal approximations c=10 b=7 a=7.14 the right angle is locate between sides a and b and the theta angle is an acutle angle sides b and c. i have sin theta as ...
*March 24, 2014*

**trig**

Suppose that Magnus' blood pressure can be modeled by the following function {{{p(t)=83-18sin(71pi*t)}}} Magnus' blood pressure increases each time his heart beats, and it decreases as his heart rests in between beats. In this equation, p(t)is the blood pressure in ...
*March 23, 2014*

**Applied Math (Biological application)**

I basically need help finding the rest of the solutions.
*March 19, 2014*

**Applied Math (Biological application)**

The deformation y(t) of heart muscle from its rest position after t seconds can be modelled as a spring-mass system, described by the differential equation: my" + vy' + ky = F(t) where m, v, and k are positive constants denoting the mass of the myocardial tissue, and ...
*March 19, 2014*

**Trigonometry**

Looks like its a triangle within a triangle problem. Still researching to try to find out how to solve
*March 18, 2014*

**Trigonometry**

figures above are correct not sure why it has me listed as Stephen. Also, hypotenuse of CB is 2537.98496522845. they are two attached triangles. CAB is the outermost triangle. CD is the opposite side of both triangles. CAD with the angle of 32 degrees. CAD has a hypotenuse of ...
*March 18, 2014*

**Trigonometry**

Mountain officials want to build a new ski lift from B to C as shown in the figure below. The distance from A to C is 1480 feet. They measure angle DAC to be 32 degrees and angle DBC to be 18 degrees. What is the distance A from to B? Round your answer to the nearest tenth of ...
*March 18, 2014*

**English**

Thank you Ms. Sue... Thank you Emmanuel
*January 25, 2014*

**English**

I am 3/7 of a chicken,2/3 of a cat and 2/4 of a goat. What am I?
*January 25, 2014*

**Science??!!! :/**

sorry i dont know:(
*January 23, 2014*

**math**

4x7-9^4= please help me im super stuck
*January 14, 2014*

**evolution article. Please help!!!**

Hi , I am having a very difficult time finding an article that contains a misconception about evolution . The article had to be be published within in this past year. Please help !!! thank you!!
*November 29, 2013*

**math**

The 7th inning needs $35000 in four years to buy new framing equipment. How much should be invested at 4%interest compounded annually.
*November 16, 2013*

**Physics**

A 55.0kg cheerleader uses an oil-filled hydraulic lift to hold four 130kg football players at a height of 1.20m. If her piston is 19.0cm in diameter, what is the diameter of the football players' piston?
*November 14, 2013*

**phyics**

A hand exerciser utilizes a coiled spring. A force of 86.9 N is required to compress the spring by 0.0231 m. Determine the force needed to compress the spring by 0.0432 m.
*November 12, 2013*

**phyics**

An object on a vertical spring oscillates up and down in simple harmonic motion with an angular frequency of 25.1 rad/s. Calculate the distance d by which the spring stretches from its unstrained length when the object is allowed to hang stationary from it.
*November 12, 2013*

**phyics**

When responding to sound, the human eardrum vibrates about its equilibrium position. Suppose an eardrum is vibrating with an amplitude of 5.0 x10-7 m and a maximum speed of 3.3 x10-3 m/s. (a) What is the frequency (in Hz) of the eardrum's vibrations? (b) What is the ...
*November 12, 2013*

**phyics**

An object on a vertical spring oscillates up and down in simple harmonic motion with an angular frequency of 25.1 rad/s. Calculate the distance d by which the spring stretches from its unstrained length when the object is allowed to hang stationary from it.
*November 12, 2013*

**phyics**

A 0.20-kg object is attached to the end of an ideal horizontal spring that has a spring constant of 120 N/m. The simple harmonic motion that occurs has a maximum speed of 1.1 m/s. Determine the amplitude A of the motion.
*November 12, 2013*

**phyics**

An object in simple harmonic motion has an amplitude of 0.202 m and an oscillation period of 0.620 s. Determine the maximum speed of the motion
*November 12, 2013*

**math**

celeste hiked 1.8 miles in 0.75 hour. What is her average rate of speed?
*November 10, 2013*

**Science **

How long will a skateboarder be out if they decide to travel for 654 meters with a velocity of 1.2 m/s
*November 5, 2013*

**Statistics**

A local grocery store wants to estimate the mean daily number of gallons of milk sold to customers. Assume the number of gallons sold follows the normal distribution, with a population standard deviation of 5.10 gallons. A random sample of 60 days shows that the mean daily ...
*October 27, 2013*

**Multiplication**

4,6;6
*September 10, 2013*

**math**

25/5 -4 * 2/9
*September 5, 2013*

**math**

express each answer in exponential form using the indicated bases 4x4x4x4,base 2
*June 25, 2013*

**biology**

what is answer
*May 28, 2013*

**math**

order the fractions 1/3 2/5 2/9 1/3 and 4/1 from least to greatest
*April 23, 2013*

**physics**

4(a) What is the magnitude of the gravitational force of the Earth on a surveillance satellite of mass 1040 kg that is in a grazing circular orbit 100 km above the surface of the Earth. (b) Find the magnitude of the acceleration of a satellite in such a grazing orbit. (c) ...
*April 22, 2013*

**3rd grade math**

they are all bigger than 2/5
*March 20, 2013*

**math 3rd grade**

hey bud, the rule is y=x ... input x =1 and output y = 1 then 1 = 1 and y = x
*March 13, 2013*

**physics**

I still dont get it. cna you explain
*March 10, 2013*

**physics**

At what height above Earth's surface is the gravitational acceleration reduced from its sea-level value by 0.60%?
*March 10, 2013*

**english**

one purpose of the summary is to ?
*March 2, 2013*

**science**

Suppose that the 1.3 km span of the golden gate bridge had no expansion joints. Calculate how much longer the bridge would be if the temperature of the bridge increases by 35 degrees celsious
*March 1, 2013*

**health**

c is wrong
*February 14, 2013*

**physics**

The four tires of an automobile are inﬂated to a gauge pressure of 1.7 × 10 5 Pa. Each tire has an area of 0.023 m2 in contact with the ground. Find the weight of the automobile. Answer in units of N
*February 12, 2013*

**physics**

A bicycle wheel has a diameter of 57.7 cm and a mass of 2.66 kg. The bicycle is placed on a stationary stand and a resistive force of 156 N is applied tangent to the rim of the tire. Assume that the wheel is a hoop with all of the mass concentrated on the outside radius. In ...
*February 8, 2013*

**Science**

What is electrolysis and what is the purpose of it? Is it dangerous?
*January 23, 2013*

**health**

so whats the answer
*January 6, 2013*

**Biology- check my answer (diff one)**

Which of the following are true concerning living things? Check all that apply. A)They contain a vital force absent in nonliving things. B)They are composed of molecules that contain carbon-carbon bonds. C)They undergo chemical reactions to use energy they acquire from the ...
*December 19, 2012*

**math**

ms sue can you check my answers please?!?!
*December 19, 2012*

**Biology-check my answer**

can someone PLEASE check this?
*December 19, 2012*

**Biology-check my answer**

Hershey and Chase used the 35S isotope to label proteins. How does this isotope differ from the 32S isotope found in greatest natural abundance, and why did they choose 35S instead of 32S? A)35S has more protons than 32S; Hershey and Chase used it because it has a greater mass...
*December 19, 2012*

**geometry**

Find the slope between the two points and then use whichever point and plug it into this equation: y-y1 = m(x-x1) where y1 and x1 are the coordinates of whichever point you pick and m is the slope
*December 13, 2012*