# Posts by an

Total # Posts: 79

**math**

Help me please!!!

**math**

A man 6 feet tall walks along a walkway which is 30 feet from a the base of a lamp which is 126 feet tall. The man walks at a constant rate of 3 feet per second. How fast is the length of his shadow changing when he is 40 feet along the walkway past the closest point to the lamp?

**math**

Why you have v(t) = 30π - π/2 t???

**math**

The upper chamber of an hour-glass is a cone of radius 3 inches and height 10 inches and, if full, it requires exactly one hour to empty. Assuming that the sand falls through the aperture at a constant rate, how fast is the level falling when: a) the depth of the sand is 6 ...

**Math**

How many of those numbers are 1s? How many numbers are there in total? put the first answer over the second one and that should be the fraction. Simplify if needed. To find the decimal, use the first answer and divide it by the second answer.

**Physics**

An automobile traveling along a straight road increases its speed from 67 ft/s to 85 ft/s in 180 ft. If the acceleration is constant, how much time elapses while the auto moves the 180 ft? Answer in units of s. Can you tell me the steps in doing this?

**Hkl**

when rounded to the nearest 10, am 20. I am an odd number. The difference in my digits is 1, am greater than 21, what number am l

**Physics**

Two particles of mass 5 g and 10 g respectively are joined by a light string which passes through a small hole on a smooth table. The smaller particle describes a circle of radius R on the table at a rate of 4 revolutions per second while the heavier particle hangs at rest ...

**chemistry**

c b

**science**

Don't know

**chemistry**

a solution is made by dissolving 25 g NaCl in enough water to make 1.0 L solution. Assume that density of the solution is 1.0 g/mL. calculate the mass percent, molarity, molality, and mole fraction of NaCl. help please 25g/58.44g NaCl=.428 mol 1000 grams of solvent H20 25g/58,...

**ap chemistry**

calculate the concentration of CO2 in a soft drink after the bottle is opened and equilibrates at 25C under a CO2 partial pressure of 0.0003 atm. c=KP henry's law k=? P=0.0003 atm. how to solve

**ap chemistry**

HELP ME WITH THIS ONE WHEN DONE WITH THE OTHER THX calculate the concentration of CO2 in a soft drink after the bottle is opened and equilibrates at 25C under a CO2 partial pressure of 0.0003 atm. c=KP henry's law k=? k for CO2 is 3.4E-2 mols/L*atm c=KP Substitute p of 3....

**ap chemistry**

also for the above question the answer for the mole fraction of NaCl is 0.00785 not 0.00766 what i do wrong moles of NaCl (.428 mol)/ moles of solution (55.9) = 0.00766 what i do wrong?

**ap chemistry**

25g/58.44g NaCl=.428 mol 1000 grams of solvent H20 25g/58,44 g x100= 42.8 % mass percent molarity .428 mol/1.0 L= .428 M molality= .428 mol/1 Kg= .428 molal is that right? help please ap chemistry - an, Tuesday, January 6, 2015 at 12:47am is that right please help me ap ...

**ap chemistry**

thanks good night

**ap chemistry**

is that right please help me

**ap chemistry**

a solution is made by dissolving 25 g NaCl in enough water to make 1.0 L solution. Assume that density of the solution is 1.0 g/mL. calculate the mass percent, molarity, molality, and mole fraction of NaCl. help please 25g/58.44g NaCl=.428 mol 1000 grams of solvent H20 25g/58,...

**operation planning**

A gourmet coffee shop in downtown SF is open 250 days a year and sells an average of 80 pounds of Kona Coffee beans a day. it purchase coffee beans for $20.00 per pound. ordering (fixed cost = $16 per order), beans are always shipped from Hawaii within exactly 2 days. Per-...

**chemistry**

0.9544 is in volts or eV?

**History**

Your good

**Math -___-**

wow stupid

**probability**

c=1/128

**History**

1. In 1916, Woodrow Wilson ordered General John J. Pershing to lead U.S. troops into Mexico to capture A. Francisco Madero. B. Victoriana Huerta. (C. Pancho Villa.) D. Porfirio Diaz. 2. The last of Wilson's Fourteen Points called for (A. the creation of a League of Nations...

**English Vocabulary fill in the blank**

1. Degenerate 2. Implausible 3. incoherent 4. intercede 5. intricate 6. sanctuary 7. scrutiny 8. sinister 9. suffice 10. vulnerable need help 1-2 Birds feel ___ to attack when they are out in the open where shrubbery is sparse. To attract them to your bird feeder, put it near ...

**Physics**

can anyone help me with question 6?

**Chemisry**

Glasses do not have slip systems Glasses are brittle at room temperature Glasses are amorphous and have no long range symmetry The volume of a sample of glass depends on its cooling rate

**chemistry**

Glasses do not have slip systems Glasses are brittle at room temperature Glasses are amorphous and have no long range symmetry The volume of a sample of glass depends on its cooling rate

**Quantum Physics**

III)Provide a unitary that maps cos (30) |0> + sin (30) |1> to cos(-15) |0> + sin(-15) |1> and cos(5) |0> + sin(5) |1> to cos(-40) |0> + sin(-40) |1> . Enter 0 in all boxes if no such unitary exists.

**science**

You are from connections academy. Look in the book.

**6th grade math**

I need help explaining ratios and proportions to my 6th grader

**chemistry**

39.2

**chemistry**

Answer: 0

**chemistry**

39.2 b

**Chemistry**

d = 0.41 how can i calculate that result?

**Chemistry**

how you clacula the number c?

**Statistics**

. State the null and alternative (research) hypothesis in symbolic form. The hypothesis should be written based on the following information from the research situation: “The health psychologist in question is particularly interested in the myth of the ‘Freshmen 15...

**chemistry**

d111 λ=3.091A a=3.53A λ=2d(111)Sin(angle) d=a/sqrt(h^2+k^2+l^2)

**physics**

If motion of a particle of mass (m) is given by y=ut+1/2gt^2 (square).find force acting on it

**physics**

a bomb of mass 5 kg explodes in to two equel fragments. At what angle these fragment fly apart ?

**MATH FAST NOW!!!!**

1.-80%(-2) (=,<,>) 120/3 2.-1750%70 (=,<,>) -1008/48 3.240/-80 (=,<,>) -150/50 4.675/-45 (=,<,>) 865/-51 5.-3755%x= -15 7.x%(-17)=-35

**Math**

Help please?!!!

**Math**

1.-80%(-2) (=,<,>) 120/3 2.-1750%70 (=,<,>) -1008/48 3.240/-80 (=,<,>) -150/50 4.675/-45 (=,<,>) 865/-51 5.-3755%x= -15 6.22=x%(-34) X=-748 7.x%(-17)=-35 8.-680 % x =53 X=-13

**Easy math**

But I need it for 6 o'clock

**Easy math**

Do you know who else can help me

**Easy math**

Ms.Sue can you help me

**math**

Susan wore the blue ribbon Clare wore the yellow ribbon Now you do jean

**physics**

A Cessna aircraft has a lift-off speed of 120 km/h. What minimum constant acceleration does this require if the aircraft is to be airborne after a take-off run of 265 m? Answer in units of m/s2 b) How long does it take the aircraft to become airborne? Answer in units of s

**Geometry**

42

**Life Orientation**

Pollution

**geometry**

6000

**physics**

If a violin string vibrates at 1720Hz, what is the wavelength of the sound produced in the surrounding air? (assume T=20 degree Celsius and speed is 344m/s)

**Radiobiology**

What exposure will a radiology technologist receive when exposed for 10 minutes at 4 meters from a source with intensity of 100 mR/min at 1 meter?

**chem**

If 1.0 L of 0.2 M Ca(OH)2 is added to 2.5 L of 0.1 M HCl, the pH of the final solution is? can someone show me the working out of this question? im very confused by it. thankyou

**English**

The marshmellow man is from ghostbusters..lol

**biochemistry**

I have three questions. I don't even know where to begin. 1. a) If an in vitro fatty acid synthesizing system is supplied with [2-14C]-acetyl CoA as the only source of radioactive label along with all other necessary cofactors/reactants for net fatty acid synthesis, in ...

**physics**

A block lies on a smooth plane tilted at an angle è = 28.5° to the horizontal. Ignore friction. (a) Determine the acceleration of the block as it slides down the plane. 1 m/s2 (b) If the block starts from rest 9.40 m up the plane from its base, what will be the ...

**math/2nd grade**

The box of An has more crayons the the box with matthew

**chemistry**

yes its right, cv, oh, lumo, homo

**CHEMISTRY (WEBWORK)**

its not F

**math**

(10 * 8) + 1 = 80 + 1 = 81 After your examples I am sure you could have figured this one out

**Mathematicas**

What generalizations can you make about the temperature that is read on the thermometer and the heat index?

**Language Studies**

Yes

**math**

Is there a number greater than six on a number cube? NO! so the answer should be 0...

**math**

No problem!

**math**

Any more questions?

**math**

The answer is 520 by the way....

**math**

well... i don't really understand that... you could just multiply all the numbers and get the answer...

**math**

well... do you have to show the compatible numbers?

**math**

sorrry it posted twice again...

**math**

Your numbers are(3+8)+2 =(8+3)+2 (3+8)=11 11+2=13 then you have (8+3)=11 11+2=13 In associative property you will use the same numbers to make different problems. They will always have the same answer. Does that help at all?

**math**

oh sorry... i posted twice... Your welcome... do you understand why it is associative?

**math**

Yes

**math**

To win $1 million, you must draw two cards whose sum is nine from a stack of cards numbered 1 through 10. After the first draw, you replace the card and shuffle the stack again for the second draw. What is the chance that your two cards will have a sum of nine? Please help me...

**science**

campare inheritance by multiple allels and polygenic inheritance

**Geometry**

well basically its asking you to find the differences (subtract) the numbers that are side by side so example 1,1,2 so you would 1-1=0 2-1=1 and so on

**calculus**

if dy/dx= (1+lnx)y and if y=1 when x=1, then y=

**algebra question**

240 is the sum of two numbers in which the larger number is 6 less than twice the smaller number what are the two numbers

**science**

big idea oof energy is shoowing the changes of how energy is transferred

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