Sunday

December 4, 2016
Total # Posts: 547

**Physics**

A person walks 2.8597x10^1 m East, then turns around and walks 8.7898x10^1 m West. The total time to walk this distance was 4.4004x10^2 s. What is the velocity of the walker, expressed to 3 significant figures? Note: Your answer is assumed to be reduced to the highest power ...

*October 11, 2010*

**physics**

A block of mass 39 kg lies on an inclined plane, as shown. The horizontal and vertical supports for the plane have lengths of 36 m and 15 m, respectively, and the coefficient of kinetic friction between the plane and the block is 0.3. The magnitude of the force ~F necessary to...

*October 6, 2010*

**physics**

i got the correct answer but i still get any of the concept >.< i feel dumb ahhh oh oh any good sites to learn physics really good

*October 6, 2010*

**physics**

A descending elevator of mass 670 kg is uniformly decelerated to rest over a distance of6 m by a cable in which the tension is 8683 N.The acceleration due to gravity is 9.8 m/s2.Calculate the speed vi of the elevator at the beginning of the 6 m descent. Answer in units of m/s.

*October 6, 2010*

**Physics**

A mining operation excavates 5.482x10^4 metric tonnes of ore each hour. In an 12 hour production shift, how much ore is excavated in kg, to 2 significant figures?

*October 3, 2010*

**Physics**

A refinery receives 4.23434x10^4 m3/h of crude oil. After the distillation process roughly 4.76216x10^1 % of the crude is converted to miltitary aviation fuel (JP4). What is the amount of JP4 produced in a day in L, expressed to 4 significant figures?

*October 3, 2010*

**Chemistry**

ok so 8.0x10^4 = 80000 tons 80000 = 176 369 809.75 pound =80 000 000 001 grams m = vxd = 80000x1.03g/mg

*September 29, 2010*

**Chemistry**

consider a neutral atom with 69 protons and 80 neutrons what is the atomic number of this element

*September 29, 2010*

**Chemistry**

A dose of asprin of 5.0mg per kilogram of body weight has been perscribed to reduce the fever of an infant weighing 8.0 pounds. One pound is 453.59g. What is the number of milligrams of asprin that should be administered

*September 29, 2010*

**Chemistry**

a dose of asprin of 5.0mg per kilogram of body weight has been perscribed to reduce the fever of an infant weighing 8.0 pounds one pound is 453.59g what is the number of milligrams of asprin that should be administered

*September 29, 2010*

**Chemistry**

a nugget of gold with a mass of 437g is added to 50ml of water the water raised to a volume of 90.0 ml what is the density of the gold

*September 29, 2010*

**Chemistry**

when is it appropriate to use gravity filtration and when to use vaccume filtration

*September 27, 2010*

**Chemistry**

when is it appropriate to use gravity filtration and when to use vaccume filtration

*September 27, 2010*

**Chemistry**

where would the safest location on the bench to set up and use a labratory burner explain why

*September 24, 2010*

**Chemistry**

when an object was weightedon a top loading balance the balance display read 13.730 the mass was recorded as 13.73g what is wrong with that explain the answer

*September 24, 2010*

**Chemistry**

it is considered a saftey hazard to leave an operating burner unatteneded unless the flame is made luminous10 explain why

*September 24, 2010*

**Chemistry**

what is the difference between a basic bunsen burner and the tirrll burner

*September 24, 2010*

**economics**

If q(P) = 100/P and c(q) = q2 , what is the optimal level of output of the monopolist?

*September 9, 2010*

**Adult Development and Psychology **

Urie Brofenbrenner

*September 7, 2010*

**math**

A total of 1200 students attend top view high school. The ratio of teachers to students is 1:30. How many teachers are there at the school?

*September 5, 2010*

**science**

A viaduct is being re-levelled by using a jackscrew with a pitch of 5mm. The mass of the top slab of the viaduct is 20 tonnes (20000kg) and its length is 40m. The lever arm used to turn the jackscrew is 60 cm long. Calculate the effort force to be applied to the end of the ...

*September 2, 2010*

**physics**

for the first question, there is 1g of water per 1 cm cube therefore there is 1000 kg of water per 1 m cube that is your answer for the 2nd one, im not sure

*September 2, 2010*

**science**

Three distinct layers of different tissue cells form the walls of blood vessels. The outer most layer is connective tissue. The middle layer is smooth muscle. The inner wall is primarily composed of endothelial cells.

*September 2, 2010*

**french**

I'm not sure I understand what youre asking here because I don't see any underlined words?

*September 2, 2010*

**french**

revois m'attendra irons emmenerons passerons

*September 2, 2010*

**science**

To stop an elevator in free fall, brakes are installed between the walls of the elevator car and the walls of the shaft in which the car moves. In addition, springs with compression coils are installed on the floor, at the bottom of the shaft, in order to absorb the residual ...

*September 2, 2010*

**biology**

For each of the following listed below, explain how it enhances the plants ability to survive and reproduce in a terrestrial environment. B) Pollen C) Waxy cuticle

*August 25, 2010*

**Chemistry**

How could hard water decrease the efficiency of your kettle?

*August 18, 2010*

**Chemistry**

Explain why the type of metal used in creating fireworks determines the colour seen when the fireworks are set off. Discuss what occurs within the metal atoms.

*August 18, 2010*

**Chemistry**

Explain what will happen to the volume of a gas as the pressure on that gas is increased. Assume that the temperature and amount of gas remain constant.

*August 18, 2010*

**Chemistry**

List three ways in which human activities have contributed to the production of gases that dissolve in water to form acid precipitation

*August 18, 2010*

**Chemistry**

If the percentage yield of a reaction was 78.51% and the theoretical yield was 288.0 g, what was the actual yield?

*August 18, 2010*

**Chemistry**

The percentage composition of chlorine, by mass, in the compound K2PtCl4 is

*August 18, 2010*

**Chemistry**

What is the difference between inference and observation?

*August 18, 2010*

**Chemistry**

Would distilled water conduct electricity? Why or why not?

*August 18, 2010*

**Child care**

I don't understand what Profit Margin is. How is the answer to 13 B? When the information provided, that the answer should be D.

*August 16, 2010*

**college**

I need help writing an outline for a persauasive essay?

*August 15, 2010*

**biology**

give 2 examples each of situations in which you might use the following pesticides Insecticides and fungicides

*August 12, 2010*

**biology**

explain the difference between gymnosperms and angiosperms give give 5 examples of each that are ontario native

*August 12, 2010*

**biology**

a) Describe the niche of the sea lamprey. b) Find out how sea lampreys may have entered the Great Lakes ecosystem. c) Identify the interspecific interactions of the sea lamprey and its effects on the Great Lakes.

*August 12, 2010*

**biology**

3. Describe the role of microorganisms (bacteria or viruses) in: a. Genetic manipulation and medical research b. Ecosystem (such as bacteria used as decomposers. Oil spill clean up) c. Food industry (microbes which are used to make yogurt)

*August 12, 2010*

**Biology**

Using the words hypertonic, hypotonic, and equilibrium correctly , predict what happens when, A) A living cell is placed into fresh water and B)A different living cell is placed into salt water.

*June 14, 2010*

**English**

I have to have 5 sentences with different verb tenses, stating The role of education in successful finanical planning.

*June 12, 2010*

**Algebra 2 Honors**

haha that would be funny, but really there are two of us here (:

*June 6, 2010*

**Algebra 2 Honors**

if that confused you, haley and i are working together.

*June 6, 2010*

**Algebra 2 Honors**

yes, but that is not an exact answer. i need a fraction of some sort, not a rounded decimal

*June 6, 2010*

**Algebra 2 Honors**

THANK YOU!

*June 6, 2010*

**Algebra 2 Honors**

1.25 is what i got

*June 6, 2010*

**Algebra 2 Honors**

im stupid

*June 6, 2010*

**Algebra 2 Honors**

The amount of light emitted from a battery indicator bulb pulses while the battery is charging. This can be modeled by the equation y = 60+60sin[(pi/4)t] , where y is the lumens emitted from the bulb and t is the number of seconds since the beginning of a pulse. At what time ...

*June 6, 2010*

**Algebra 2 Honors**

Find the exact value by using an appropriate sum or difference identity. cos(165) degrees

*June 6, 2010*

**Algebra 2 Honors**

Find all solutions if 0 degrees is less than or equal to x and x is less than 360 degrees. 2 sin^2(x)+ sin(x)=1

*June 6, 2010*

**Algebra 2 Honors**

sin 2x(cot x + tan x) = 2 (verify the identity)

*June 6, 2010*

**Grammar, **

Please can you tell me if these are correct. Identify the noun clause. I put brackets around them. 1. (How the secret leaked out) was not immediately apparent. 2. (Where the stall has moved to) has not been ascertained. 3. The invited guests said (they would attend the party...

*June 5, 2010*

**Grammar again**

What is the difference between a noun phrase and a noun clause? This says to change box b into noun phrases to match box A. Example: I can't get over... I hear her rude comments. I can't get over hearing her rude comments. But in this section of the book, it explaines ...

*June 4, 2010*

**Noun phrases**

We have to identify the noun phrases, I've put brackets around them. 1. (the children) are playing in the back garden. 2. Justin came to school with his (younger sister). 3. (the old woman) hobbled into the kitchen. 4. Look at (the short ugly looking boy) who is throwing ...

*June 4, 2010*

**Chemistry-Dr. Bob**

Please help me in any way to relate the concepts of how heat, solutions,equillibrium, nuclear and organic chemistry are interrelated. I appreciate any direction or info you could provide, Dr. Bob Thank you

*June 2, 2010*

**chemistry**

A certain gas has a volume of 20 cu ft and a pressure of 10psia at -40 degrees F. What is the new pressure if the gas is compressed to 5 cu ft at -40 degrees C.. a. 0.025 psia b. 0.4 psia c. 10 psia d. 40 psia.

*May 18, 2010*

**statistics**

would the percentage of scores greater than 120 be 4.865 or 4.87

*May 16, 2010*

**statistics**

assume that a set of test scores is normally distributed with a mean of 100 and a standard devaiton of 20. Use the 68-95-99.7 rule to find the following quantities: a. percentage of scores greater than 120

*May 16, 2010*

**Chemistry**

What is the formula for calcium oxalate dihydrate when 100 degree Celsius heat is added?

*May 16, 2010*

**statistics**

99.0-98.2/0.62 Answer = 1.29 Is this correct?

*May 16, 2010*

**statistics**

assume the body temperature of healthy adults distributed with a mean of 98.20F and a standard deviation of 0.62F. If you have a body temperature of 99.00F, what is your percentile score?

*May 16, 2010*

**statistics**

Using the 68-95-99.7rule. Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the 68-95-99.7 rule to find the following quantities: a. percentage of scores less than 100 b. relative frequency of scores less than 120 c...

*May 10, 2010*

**statistics**

Which of the following statements are correct? a. a normal distribution is any distribution that is not unusual b. the graph of a normal distribution is bell-shaped c. if a population has a normal distribution, the mean and the median are not equal d. the graph of a normal ...

*May 10, 2010*

**math**

Electrical system are governed by Ohm's law, which states that V = IR, where V=voltate, I=current, and R=resistance. If the current in an electrical system is decreasing at a rate of 9 A/s while the voltage remains constant at 14 V, at what rate is the resistance ...

*May 2, 2010*

**Calculus**

Find the derivative of (sin(^3)x)(tan x) Please explain to me in steps please , thank you

*April 19, 2010*

**English**

how peple come from

*April 9, 2010*

**English**

hi how are you

*April 9, 2010*

**Chem**

delta h is 2800

*April 7, 2010*

**Math7**

Find the cost of the following situation. Dress Sale: Regular:$160 Now:$112 What % is given on the price of the dress?

*March 18, 2010*

**math**

The basketball coach wants to know the perimeter of the court. The area of the court is 4700 feet2. What is the perimeter? The long side of the court is 94 feet.

*March 18, 2010*

**Physics **

A bullet with mass 0.40 kg is fired with an initial velocity of 400 m/s from a gun with mass 5.0 kg. The speed of the recoil of the gun is?

*February 27, 2010*

**managerial finance**

Find the current value per share of Suarez Manufacturing’s common stock.

*February 23, 2010*

**Eth125**

I just wanted to know if anyone has a course syllabus for this class. I start this class very soon and I would like to get a head start. Thank you so much.

*February 19, 2010*

**soc 300**

Explain the Modernization and Dependency theories as they relate to underdevelopment. What are the major contributions of each theory and what are the greatest weaknesses? Explain which theory of underdevelopment has greater empirical support, particularly statistical support...

*January 16, 2010*

**algebra**

Distributive, Associative, or neither? 3(bz)=(3b)z

*January 14, 2010*

**physics**

When a horizontal force of 7N acts on a block on a resistance free surface, it produces an acceleration of 3.5m/s^2. suppose a second 4kg block is dropped onto the first. what is the magnitude of the acceleration of the combination if the same force continues to act? Assume ...

*December 7, 2009*

**Physics**

Problem:: A 4.80 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=13.5 N at an angle q= 17.5° above the horizontal. What is the speed of the block 3.90 seconds after it starts moving? What I've got:: Using sin and cos, I'...

*November 20, 2009*

**geometry**

a right trapezoid

*November 11, 2009*

**4th grade**

need help with edhelperku puzzle

*November 4, 2009*

**college**

The clarke family went sailing on a lske . thier boat averages 6 kilometers per hour

*November 4, 2009*

**physics**

A 70.0 kg climber is supported in the "chimney" by the friction forces exerted on his shoes and back. The static coefficients of friction between his shoes and the wall, and between his back and the wall, are 0.760 and 0.610, respectively. What is the minimum normal ...

*October 26, 2009*

**Skills for Learning in an Information Age **

What are some ways in which you may make use of Web-based information and guard against plagiarism?

*October 15, 2009*

**psychology 11**

ya i think d. too.

*September 10, 2009*

**English**

Your Welcome!

*September 10, 2009*

**English**

Humerus I think is a bone and humorous is funny.

*September 10, 2009*

**English**

I would say #2 because it sounds better.

*September 9, 2009*

**English**

#1 is grammatically corect I think it sounds better. In #4 They will make you get better grades. The correct way to say that is They will help you get better grades. In #5 From your friends you can get help. The correct way to say that is You can get help from your friends.

*September 9, 2009*

**7th grade**

What is the definition of the word "hamebells" from the book "The Red Pony" by Steinbeck. I have searched all dictionary sources I could and can't seem to find out anythin on it. Is it, perhaps, a slang word for something else?

*September 9, 2009*

**algebra**

Do this problem one step at a time. Parenthesis's first, then multiplecation and division, next then adding and subtracting. Think of P.E.M.D.A.S.

*September 9, 2009*

**Chemistry**

student perform 2 melting point determinations on a crystalline product. In one determination, the tube contained a sample 1 - 2 mm in height, and the melting point was 141 - 142 ¢ªC. In the second determination, the sample hight was 4 - 5 mm and the melting range ...

*September 1, 2009*

**Chemistry**

Student in O-Chem Lab conducts a melting point experiment with an unknown compound and observes a melting range of 210 – 218C. Is this a typical range for a melting point? If not, what range would be typical? For this question, does it mean an unknown compound in general...

*August 30, 2009*

**O-Chem**

Yea my prof was not very clear or did not clarify what hot water would be. Thanks for the help.

*August 29, 2009*

**O-Chem**

Then the minimum volume of hot water then is 2.70mL

*August 29, 2009*

**O-Chem**

Find the minimum volume of hot water needed to dissolve 100 mg of salicylic acid. Can someone help me how to start this out? I would greatly appreciate it. The data is [temp] [amount of salicylic acid per 100 ml water, g] 0 0.10 10 0.13 25 0.23 50 0.63 75 1.8 90 3.7

*August 29, 2009*

**integration**

please help emergency. find double integral of x times y time e to the <x plus y> . bounded from <0,1> x <0,1>

*August 21, 2009*

**Math**

Can someone please check my answers below for accurateness? The instructions are: Differentiate and simplify. 1) y=(2x^2+3x-1)(3x^2-5x-3) y'=(4x+3)(3x^2-5x-3)+(2x^2+3x-1)(6x-5) 2) y=(5x^2+3x-1)(3x^2-5x-3) y'=(10x+3)(4x^2-3)+(5x^2+3x-1)(8x) 3)y=6x^3-7x^2+5x-7+x^(5/3)-7...

*August 7, 2009*

**Math**

a) determine the equation of the line that is perpendicular to the tangent to y=5x^2 at (1,5). b) determine the equation of the line that passes through (2,2) and is parallel to the line tangent to y=-3x^3-2x at (-1,5).

*August 2, 2009*

**Health**

AIDS/HIV funding and Research

*July 28, 2009*