# Posts by christine

Total # Posts: 557

**chemistry**

I really really need help w/this problem I think i figured it out but i have to be sure i did it right in order to do others similar to it please help thanks Metal Specific Heat (J/g-C) Al (s) 0.900 Au(s) 0.129 Cu(s) 0.385 Fe(s) 0.444 Hg(l) 0.139 H2O(l) 4.184 C2H5OH(l) 2.46 A ...

**Chemistry**

Metal Specific Heat (J/g-C) Al (s) 0.900 Au(s) 0.129 Cu(s) 0.385 Fe(s) 0.444 Hg(l) 0.139 H2O(l) 4.184 C2H5OH(l) 2.46 A piece of metal at a temp of 95.0oC and a mass of 67.0 g is dropped into a beaker of water containing 100 g at a temp. of 30.0oC. If the final temperature ...

**Physics**

An object with a mass of 2.728x10^1 kg is subjected to a force of 1.31851x10^3 N directed at an angle of 1.056x10^1 degrees from the x axis. A second force of 1.93826x10^3 N acting in the negative Y directions is also applied to the object. To two significant figures what is ...

**physics**

a kid goes down a slide, accelerating at 1 m/s^2 for 3 seconds. if he starts at rest, how long is the slide ? this is the equation i have but i need Xi which i have NO clue what it is .. Xf= Xi+ 0m/s(3s)+1/2 (1m/s^2)(3^2s) solving for Xf ... need Xi

**chemistry**

What volume (in Liters) of oxygen must react to form 17.0L of carbon dioxide according to the following balanced equation: 2CO(g) + O2(g) --> 2CO2(g) 17.0 L CO2 x (1 moles O2/2 moles CO2) = 17.0 x (1/2) = 8.5 L did i do this problem correctly

**college chemistry**

What volume (in Liters) of hydrogen must react to form 17.0L of ammonia according to the following balanced equation: N2(g) + 3H2(g) --> 2NH3(g) Assume an excess of N2 and that all are at the same temperature and pressure.

**Physics**

space shuttle travels at about 7.4581x10^3 m/s. An astronaut takes about 1.5933x10^2 ms to blink an eye. How far does the space shuttle travel in that time, expressed to 4 significant figures?

**Physics**

A plane travels with a uniform velocity of 3.399x10^1 m/s for a period of 2.267x10^0 seconds. What distance is travelled during this time, in meters

**stats**

Mean is 60 and standard deviation is 7. what percentage is 73 and below.

**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 ...

**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 ...

**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...

**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

**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.

**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?

**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?

**Chemistry**

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

**Chemistry**

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

**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

**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

**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

**Chemistry**

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

**Chemistry**

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

**Chemistry**

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

**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

**Chemistry**

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

**Chemistry**

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

**economics**

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

**Adult Development and Psychology**

Urie Brofenbrenner

**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?

**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 ...

**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

**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.

**french**

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

**french**

revois m'attendra irons emmenerons passerons

**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 ...

**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

**Chemistry**

How could hard water decrease the efficiency of your kettle?

**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.

**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.

**Chemistry**

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

**Chemistry**

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

**Chemistry**

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

**Chemistry**

What is the difference between inference and observation?

**Chemistry**

Would distilled water conduct electricity? Why or why not?

**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.

**college**

I need help writing an outline for a persauasive essay?

**biology**

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

**biology**

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

**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.

**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)

**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.

**English**

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

**Algebra 2 Honors**

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

**Algebra 2 Honors**

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

**Algebra 2 Honors**

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

**Algebra 2 Honors**

THANK YOU!

**Algebra 2 Honors**

1.25 is what i got

**Algebra 2 Honors**

im stupid

**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 ...

**Algebra 2 Honors**

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

**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

**Algebra 2 Honors**

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

**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...

**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 ...

**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 ...

**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

**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.

**statistics**

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

**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

**Chemistry**

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

**statistics**

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

**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?

**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...

**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 ...

**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 ...

**Calculus**

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

**English**

how peple come from

**English**

hi how are you

**Chem**

delta h is 2800

**Math7**

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

**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.

**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?

**managerial finance**

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

**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.

**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...

**algebra**

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

**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 ...

**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'...

**geometry**

a right trapezoid

**4th grade**

need help with edhelperku puzzle

**college**

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

**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 ...

**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?

**psychology 11**

ya i think d. too.

**English**

Your Welcome!

**English**

Humerus I think is a bone and humorous is funny.

**English**

I would say #2 because it sounds better.

**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.

**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?