Friday

April 18, 2014

April 18, 2014

Total # Posts: 104

**Chemistry**

The mass of a sample of boron atoms is 5.60 g. How many boron atoms are in this sample? Show work, and explain.

**grammar**

What is the complete subject if the following sentenc:some people like to take classes to learn new things

**economics**

Explain three ways the workplace in the US has changed since the 50s.

**economics**

B?

**economics**

A producer would have an added incentive to enter a market if the: A. prices for microwave oven sharply decreased. B. price for tennis shoes sharply increased C. supply of apples increased, causing a surplus D. supply of cell phones satisfied consumer demand (I think it's ...

**economics**

i'd go with D.

**economics**

Which is most likely to have an inelastic demand? A. an expensive sports car B. experimental cosmetic surgery C. organic fruits and vegetables D. an effective cancer-fighting drug

**investing**

A company is thinking of investing some surplus cash in 30 year $1000 face value Microsoft 6% annual coupon bonds. It plans to pay $925 each for 10,000 of them, now, and expects to SELL them for $1025 each at the end of 5 years. Make a determination about the economic viabilit...

**chemistry**

what is the molarity of the solution obtained by mixing 25.0 ml of a 3.00 M methyl alcohol solution with 225.0 ml of a 0.100 M methyl alcohol solution?

**math**

12 bows

**Algebra**

In the following problem, the digits 0-9 have been replaced with letters. Can you reconstruct the original multiplication problem by identifying what digit each letter represents? TEA (times)x_TEA_ SEA TNNA (add)t_TEA_ (ans.) CHINA

**Algebra**

Find the equation of the line and write your answer in the slope-intercept form. 1. Has a y-intercept of 5 and a slope of 2. Has a slope of -5 and a y-intercept of 2/3. 3. Has a slope of -3 and contains (4,9). 4. Has a slope of 4/9 and contains (0,-2) 5. Contains the points (4...

**Algebra**

The perimeter of Greg's rectangular deck is 170 feet. The length of the deck is four times the width. What is the dimensions of the deck?

**Chemistry**

In an experiment, 0.0300 moles each of SO3(g), S02(g), and O2(g) were placed in a 10.0L flask at a certain temperature. When the reaction came to equilibrium, the cocentration of SO2(g) in the flask was 3.50x10^-5 molar. What is Kc for the reaction? 2SO2(g) + O2(g) <--> ...

**physics**

Suppose we attempt to account for air resistance in our projectile motion in the following (incorrect) way: we alter g so that the acceleration in the y direction is -8 m/s2, and introduce a horizontal acceleration of -3 m/s2. With these changes, find the landing point of a pr...

**physics**

A projectile is shot at 35° to the horizontal and lands 12 s later at the same elevation. (a) What is the projectile's initial speed? (b) What is its maximum altitude?

**Alg**

solve: x + 8 = 2(x-2) - x

**Calculus**

The figure is an invertible function . Use the figure to find the following: ƒ−1(-3)= ƒ−1(-2)= ƒ−1(-1)=

**physics**

The vector V is given by V = (5.0x-12.0y )m. What is W such that V + W = -5|V|x?

**physics**

The acceleration of a certain particle is a function of time: a(t) = pt^2-qt^3, where p and q are constants. Initially, the velocity and position of the particle are zero. (a) What is the velocity as a function of time? (b) What is the position as a function of time?

**physics**

A ball is thrown upward in such a way that its speed is 32.3 m/s when it is at half its maximum height. Find (a) its maximum height, (b) its velocity 2.0 s after it's thrown, (c) its height 2.0 s after it's thrown, and (d) its acceleration at its maximum height. Please...

**physics**

An asteroid moves toward the sun along a straight line with a velocity given by v = -(c1+c2/x)½ , where x is the distance from the center of the sun. Use the chain rule for derivatives to show that the asteroid's acceleration is a = -c2 /2x^2.

**physics**

A particle moves along the y axis according to y(t)=(3.5 m/s^2)t^2 - (9.0 m/s)t + 5.0 m. (a) What is the particle's velocity as a function of time? (b) What is the particle's acceleration at t=2.0 s?

**physics**

An object has an acceleration of +1.4 m/s2. At t=4.0 s, its velocity is -4.5 m/s. a) Find the object's velocities at t=1.0 s and t=7.0 s.

**algebra**

What is the value for the coefficient determinant (D) in the following system? 4x – 3y = 16 3x + 7y = –25 A. –37 B. –19 C. 37 D. 52

**math**

The price of a shirt is reduced by 30% to $14. What was the original price of the shirt?

**math**

Verify cos(x-3pi/2)=-sin x

**Math**

Find the formula for piecewise function f(x) = ____ if x < or equal to -1 ____ if -1 < x < or equal to 2 ____ if x > 2 Thanks! I got -1, x, and 2. Am I right?

**Chemistry**

Would PV=nRT apply to this? if so, how do I find "n"?

**Chemistry**

Would PV=nRT apply to this? if so, how do I find "n"?

**Chemistry**

what volume of oxygen gas measured at 25C and 760 torr is required to react with 1.0L of methane measured under the same conditions of temperature and pressure?

**BUSINESS**

1. Which one of the following is not a benefit to the employer when offering an ESOP? (Points : 1) maintains a stable work force owner can sell stock to a friend results in a dilution of value of the stock ESOT can borrow money under favorable conditions 2. All but which one ...

**linguistics**

why is there a length difference between the word "house" in 'greenhouse' and 'green house' when you say the word? I know it takes longer to say 'house' in "green house" but why does it take longer? please help me. I am so confused :(

**algebra**

Average cost of a bicycle is modeled by the function c(x)=.1x^2-1.7x+10 where c(x) is measured in dollars. how many bicycles should be built in order to minimize the average cost per bicycle?

**calculus**

If X = 15, Y = 20, and Z = 25, what is the sine of angle B?

**math word problm**

WHAT IS THE TENTH DIDGIT IN THE QUOTIENT 120 / 11? A. 0 B. 1 C. 8 D.9 I CHOOSE 9 THATS WHAT I GOT IN LONG DIVISION. THE TEMPERATURE ON mARS REACHES 27DEGREE CELSIUIS DURING THE DAY AND -125 DEGREE CELSIUS AT NIGHT. WHAT IS THE AVERGE TEMPERATURE? NOT SURE HOW TO DO THIS? 27 - ...

**math questions**

OK SO 1ST ONE IS 99 I Still dont understand how its +3 difference? can you explain?

**math questions**

for no 1) I'm confused the data is: 86 96 88 91 which = 361 with a test score of 99 added in its; 86 96 88 91 and 99 = 460 /5 = 92% and i dont understand how you get 3 meters i got -3 meters -2-1= -2 + -1 = -3

**math questions**

WORD PROBLEM: Tims tet grades in french were: 86,96,88,91 what score must Tim make on his next test to average 92? a 89 b 93 c 97 d 99 I said 99. because when you add all numbers its 460/5 = 92 2) the water level indicator measures the rise and fall in meters of the water leve...

**math**

word problem: The Rory family drove 310 miles each day for 4 days. Then on Friday they drove 250 miles to Centerville. On Saturday they drove 150 miles to Westfield. What else do you need to know to determine how many miles they averaged each day for that one week? a) number o...

**MATH BOB PURSLEY**

Can you check if I have right now?

**MATH**

WAS THE TENTH DIGIT 9 CORRECT IN FIRST QUESTION? FOR 2ND QUESTION AVERAGE TEMPERATURE I GOT 27 + -125 = -76 FOR LAST ONE: -3 - (-9) = +6 SO THE ANSWER WOULD BE : C 1 ONLY IS TRUE -- IS THAT CORRECT NOW? FO

**MATH**

WHAT IS THE TENTH DIDGIT IN THE QUOTIENT 120 / 11? A. 0 B. 1 C. 8 D.9 I CHOOSE 9 THATS WHAT I GOT IN LONG DIVISION. THE TEMPERATURE ON mARS REACHES 27DEGREE CELSIUIS DURING THE DAY AND -125 DEGREE CELSIUS AT NIGHT. WHAT IS THE AVERGE TEMPERATURE? NOT SURE HOW TO DO THIS? 27 - ...

**Math (Urgent)**

Use the Midpoint Rule to approximate the integral (–10x+7x^2) from 10 to 17 with n=3

**biology**

What is a possible system that can be used to test respiration in a small animal?

**Statistics**

Suppose that 92% of all SFSU students own a cell phone. Find the probability that 7 out of 10 random selected SFSU students own a cell phone. explain how answer was arrived

**Statistics**

Suppose that 92% of all SFSU students own a cell phone. Find the probability that 7 out of 10 random selected SFSU students own a cell phone

**Maths**

Perimeter = 216 and the length is (2X)+3 more than the width. How do I solve for X and what is the rectangle length. I am really stuck!

**math 4th grade**

n divided by 5 equals 105 how do you no that the tens place in n is less than 5

**Physics**

its a triangle on a table with an unknown angle. the two masses are connected by a string.

**Physics**

An inclined plane is on a table 1.4m tall. A 6kg box is hanging vertically attached to a 2kg mass on a plane with an unknown incline plane with coefficient of sliding friction of .2 . a. determine the acceleration of the system. b. if the plane is 3.5m long and the blacks begi...

**math**

tree casts a shadow 32 feet on the ground. If the distance from the end of the shadow to the top of the tree is 40 feet, how tall is the tree?

**Biology**

Chemical bond formation

**physics**

really stuck, a 90 kg skier has 140 KJ of total mechanical energy when he is at a height of 120m above the bottom of the hill. calculate the skiers kinetic energy. calculate his speed?

**math**

rounded to the nearest ten i am 780. iam even.the sum of my digits is 17.

**physics**

What is the required resistance of an immersion heater that will melt 6.39 kg of ice at 0°C in 36 min while operating at 110 V? im not too sure how to do this because delta_T=0. With the equations im using, i get 0 but its not the answer and im not quite sure what to do. t...

**AP history**

Decade charts - teacher looking for Prospects - what would that mean

**Chemistry**

Suppose a compound is involved in three different reactions denoted R1, R2, and R3. Tripling the concentration of this reactant in all three reactions causes the rates of reaction to increase by factors of 3, 9, and 1, respec- tively. What is the order of each reaction with re...

**physics**

ok so dr= 2i + 3j while F= 5i + 2j It wants me to find the work. now i know w=Fxdr. what i want to know is why when you take the dot product of both, you get a different answer compared to when you just multiply the magnitudes.

**Chem**

1.049 and .9982 respectively.

**Chem**

Calculate the volume ( mL ) of the solute acetic acid and the volume ( L ) of the solvent H2O that should be added to generate 5.01 kg of a solution that is 0.694 m acetic acid. volume ( mL ) of the CH3CO2H volume ( L ) of the H2O i just want to check my answers...its either i...

**earth**

Could you tell a story of the rock cycle using a rock called Roger the Rock??

**algebra**

give an example of a number that is a integer, but not a whole number

**math**

I am trying to prove the formula..

**math**

Help?

**math**

Wow that did not work... Prove (dphi/ds) = ( xprime*ydouble prime - xdoubleprime*yprime ) / (vector V)^3

**math**

I understand that much, but I still cannot derive the curvation equation.. a.Let x prime and x double prime be the first derivative and second derivatives of x with respect to t, and similarly for y. Show the following in true. dƒ³/ds = ( xŒ yŒ&...

**math**

These questions relate to curvature problems. a.Explain why (dÖ/ds) = (dÖ/dt) (dt/ds). b.Explain why tanÖ = dy/dx, which equals (dy/dt) / (dx/dt).

**Geometry**

Dodecagon

**Math**

(Growth of Cells) Suppose that after t hrs, there are p (t) cells present in a culture, where P(t) = 5000e*^2t a) How many cells were present initially? b) Give a differential equation satisfied by P(t) c) When will the population double? d) When will 20,000 cells be present?

**Algebra 1**

Duh!! Twenty minutes too.

**Algebra**

Find the slope of the line that goes through the given points. I think I figured out the answer but I would appreciate any feedback thanks! (3,-2),(-1,-6)

**Algebra**

I need 3 ordered pairs of points that would be solutions to this equation I have an idea of what suppose to fit because I think this equation has infinate solutions. What do you all think. Thank you! 4x - y = 7

**chemistry**

We did an experiment on Quantitative Analysis of Soda ash by Double-Indicator Titration. What is the cause of carbonate error and its effect on the calculated values obtained in standardizatin and sample analysis?

**physics**

No, not average displacement, "angular displacement". We used a spectrometer in this experiment. We were always checking if the grating was aligned. What happens to the ANGULAR displacement and the wavelength reading when the grating isn't aligned?

**statistic**

Given TWO SETS of congruent angles, what is the probability of selecting two consecutive angles that are congruent?

**math**

use only 10s to make the number 40 in two parts (5 ways) 1+3 2+2 3+1 what are the other two?

**math**

use only tens to make the number 40 in two parts (5 ways)

**math**

How would you solve for x in this equation: (y^2+y-6)(3y+1)=0

**math**

How would you solve for x in this equation: (x^2-9)(2x-1)=0

**biology**

how do nonliving thing grow

**Science**

does wiping your perspiration increase the rate at which you perspire?

**French**

What is the difference between meilleur and mieux. Which one do I use for It is better to.... C'est meilleur or mieux de ....

**biology**

why do macrophages have high numbers of ribosomes and lysosomes

**Solving Equations with variable on Both Sides**

I need help solving this. I've never been really good with fractions, so, thats probably why.: 3p/8 + 7p/16 - 3/4 = 1/4 + p/16 + 1/2

**Physics**

A person eats a container of yogurt. The Nutritional Facts label states that it contains 195 Calories (1 Calorie = 4186 J). What mass of perspiration would one have to lose to get rid of this energy? At body temperature, the latent heat of vaporizaiton of water is 2.42 106 J/kg.

**Physics**

A steel section of the Alaskan pipeline had a length of 65 m and a temperature of 16°C when it was installed. What is its change in length when the temperature drops to a frigid -39°C?

**english**

i need help in writing an ironic paragraph

**english**

I have to do a visual presentation for pride & prejudice & jane eyre. Any suggestions...i'm not very creative.

**Chemistry**

What is the molarity of a sodium chloride solution if 31.0 grams of sodium chloride is added to enough water to make 1.84 liters of solution?

**English/Poetry**

I need to write a poem for my English class. The thing is, I don't know how to write a good poem. I've read loads of poems, but I just don't know how to write a good poem.

**Physics**

Why does the central maximum of a diffraction pattern is twice as long as any other? Thank you

**social studies**

Describe the interdependence of Great Britain and the American colonies giving specific examples?

**physics**

just wondering if anybody have any suggestions for a physics project (anything that deals with physics)??? thanks Research the Klien-Fogleman wing and its advantages over conventional wing shapes.

**physics**

1. Outlets of two rooms are placed in parallel on a single circuit (120 volts). How many 100 watt light bulbs could you run on a circuit that had a 15 amp circuit breaker (max of 15 amps total) need help setting up problem?? Each 100 W lamp draws I = P/V = 100/120 = 0.83 Amps,...

**physics**

1. x-ray machine operates at 200 kv with a current of 10 mA. The power mus be produced by a transformer which raises the voltage from 220 volts to 200 kilovolts. The power going into and out of the transformer is the same. How much current must flow in the 220 volt line to ope...

**physics**

Fluid A is more dense than fluid B 1. densities of the objects are more than the densities of the fluids, which object will have the greatest buoyant force when placed in the fluids. 2. densities of the objects are less than the densities of the fluids, which object will floa...

**physics**

balloon filled with 1 liter of water (1000 cm^3) in equilibrium in a container of water, the balloon is totally submerged in the water. a. What is the mass of 1 liter of water? b. What is the weight of the 1 liter of water? need assitance in setting up problem and figuring out...

**physics**

if a child pulls an old wagon up a steep incline on a sidewalk, what does a child's work do? i say, it would increase, due to the fact that it is a steep hill and it takes more work to pull the wagon up??? The child's work is done aganst gravity, and results in an incr...

**physics**

because of friction, a constant force of 20 N is needed to slide a box across a room to the right at a constant speed, and box is moved 3 m. What is the friction force and how much work is done by friction force?? How much work is done by gravity? How much work is done by norm...