Wednesday

April 23, 2014

April 23, 2014

Total # Posts: 400

**math**

i dont understand what they are asking me to do when they give me a quhat looks like this (write acute,right,or obtuse for each angle 1.AFD 2.BFD and thers a bunch of line that intersect off to the side

**Physics**

A 30m high cylindrical water tank has a diameter of 14m. The tank is two-thirds full of water. What is the pressure at the bottom of the tank?

**math**

John had $24.He spent 2/3 of his money.How much he has left.

**Chemistry**

A solution is prepared by mixing 45.00 mL of 0.022 M AgNO3 with 13.00 mL of 0.0014 M Na2CO3. Assume volumes are additive. Calculate [Ag+], [CO32-], [Na+] and [NO3-] after equilibrium is established.

**Chemisty**

Consider a 1.50 L aqueous solution of 3.75 M NH3, where 17.5 g of NH4Cl are dissolved. To this solution, 5.00 g of MgCl2 are added. a. What is [OH-] before MgCl2 is added? b. Will a precipitate form? c. What is [Mg2+] after equilibrium is established? I don't need the answ...

**physics**

The position of a particle moving along the x axis is given by x=3.0t^2 - 1.0t^3 , where x is in meters and t in seconds. What is the position of the particle when it achieves its maximum speed in the positive x direction

**Chemistry**

Thanks so much! I never would've figured that out.

**Chemistry**

A saturated solution of calcium chromate (CaCrO4) freezes at -0.10 C. What is Ksp for CaCrO4? Assume complete dissociation. The density of the solution is 1.0 g/mL.

**Chemistry**

When excess NaOH is added to Zn(OH)2, the complex ion Zn(OH)4 2- is formed. Determine the molar solubility of Zn(OH)2 in .10 M NaOH. Compare with the molar solubility of Zn(OH)2 in pure water. I thought I knew how to do this problem, but I'm not getting the right answer. I...

**Chemistry**

*To be entirely correct, you'll want to use the values for hydrogen and oxygen gas. I'll let you figure those out, along with the molar ratios for hydrogen gas and water and oxygen and water.

**Chemistry**

Using the molar masses of hydrogen and oxygen, you can discover your limiting reactant (the reactant that would produce the least water). The water produced by your limiting reactant would be the amount of water formed. (2.4 g H)(1 mol H/1.008 g)(1 mol H20/2 mol H)=1.19 mol H2...

**Chemistry**

Use standards entropies and heats of formation to calculate delta Gf at 25C for a. cadmium (II) chloride (s) b. methyl alcohol, CH3OH (l) c. copper (I) sulfide (s) I really have no idea where to start with this problem. I have no idea how to calculate delta Gf, and everything ...

**Physics**

A daredevil decides to jump across a 15 m wide canyon on his motorcycle. The opposite side of the canyon is 3 m lower than the side the daredevil starts on. The daredevil drives his motorcycle off the cliff at a speed of 27 m/s. How long does it take the daredevil to cross the...

**Math**

j+4/6=8/12

**American History**

Why did the 21 amendment repeal the 18 amendment?

**calculus**

Find the derivative of the function. G(y) = (y − 1)3/ (y2 + 2y)7

**probability**

if you have a spinner with 3 parts. 1 white 2 blue. and you spin the spinner 90 times how many times do you expect the spinner to land on blue

**math**

Recently a census was taken on space station Gamma. Of the 100 residents interviewed, 75 traced their ancestry to the planet Omicron, 85 traced their ancestry to the planet Omega and 60 residents traced their ancestry to both planets. How many residents had ancestors from ONLY...

**Math**

IDK

**geography**

We need help with finding Canada's fourteen capitals can u help us please

**geography**

We need help with finding Canada's fourteen capitals can u help us please

**Basic Physics**

2.5 h = 9000s 10m/s x 9000s = 90000m

**Government**

United States

**Government**

The President can choose to get rid of democracy. True or False?

**Math**

What is the integral of dx/(x^3-9x)? Please post steps too please!

**math**

Yes. Thank you.

**math**

If = sin-10.398, then =_____o_____' _____". Round to the nearest second.

**giving up**

i'm depressed that no-one has answered my science question so i'm giving up and i don't care if i fail my science because it will be all googles fault the only thing i know about the xenon 135 is that it's a tennis/squash racket and i needed the element xenon 1...

**none**

read my question above

**Science**

Identify and describe the type of radiation emitted during the radioactive decay of the radioisotope xenon 135

**math**

a jar contains two red and five yellow marbles. A marble is drawn at random and then replaced. A second draw is made at random. find the probability that both marbles are red?

**chemistry**

magnesium in flashbulbs burn according to the equation 2Mg + O2 ---> 2MgO what mass of Mg combines with 5.80 L of O2 measured at STP?

**english**

St. Patricks day is on March 17, every day. i am glad to answer this question for you.

**Physics**

i am not sure

**geometry**

The ratio of two similar prisms is 2:5 the volume of the larger is 375cm3 if sand is being poured into the smaller prism at 3cm3 per second how many seconds will it tAke to fill the smaller prism?

**Math**

10 cups

**Math**

Suzanne has a liter of apple juice. How many cups with a capacity of 100 mL can she fill with apple juice?

**math**

A basketball has a diameter of 29.5 inches. If the basketball is fully inflated, about how many cubic inches of air will it hold?

**English**

Which senses are appealed to in these lines from Macbeth? Nay, had I pow'r, I should / Pour the sweet milk of concord into hell, / Uproar the universal peace… A. smell, taste, and touch B. hearing, sight, and smell C. sight, taste, and hearing D. hearing, taste, and t...

**Math**

find the average rate of change from 1 to x Find the average rate of change from 1 to 3 Using f(x) = -2x^2+6x

**Math**

find the average rate of change from 1 to x Find the average rate of change from 1 to 3 Using f(x) = -2x^2+6x

**Mathematics. Geometric sequences.**

2+4+8+...is a geometric sequence. Prove the sum of the first n terms is two less than the (n+1)the term.

**Government**

When has the constitution protected 2 fundamental principles? When has it failed to protect 2 fundamental principles?

**Chemistry**

How many grams of oxygen are collected in a reaction where 247 mL of oxygen gas is collected over water at a temperature of 25°C and a total pressure of 697 torr? And would i just convert 697 torr into atm and use that for pressure? And how do i find the molar mass of the ...

**Chemistry**

It takes 200. seconds for a sample of carbon dioxide to effuse through a porous plug and 280. seconds for the same volume of an unknown gas to effuse under the same conditions. What is the molar mass of the unknown gas? Enter your answer to 3 significant figures.

**Chemistry**

So would i just convert 697 torr into atm and use that for pressure? or what do i do with the 25C/760?

**Chemistry**

How many grams of oxygen are collected in a reaction where 247 mL of oxygen gas is collected over water at a temperature of 25°C and a total pressure of 697 torr?

**Math**

Write an equation you could use to solve each problem. Solve each equation by systematic trial. Josie had only nickels in her purse. The value of the coins was 80 cents. How many nickels were in Josie's purse?

**Physics**

A total of 100000 kg of water per second flows over a waterfall 30 m high. If half of the power this flow represents could be converted into electricity, how many 100 watt lightbulbs could be supplied?

**Social Studies**

what 5th grade social studies word starts with Y,Z,and N?

**math**

I family of ducks contains 7 ducks which are 44 lbs. The other wieghs 32 lbs (no amount of ducks given) How much does each duck and duckling weigh in each group THEY HAVE TO WEIGH THE SAmE IN EACH GROUP

**Problem Solving: Writing to Explain**

how do you order least to greatest for fraction 3/12 1/6 and 1/3

**math**

Andy and Sam are saving money to go on their senior trip. The amount of money that Andy will have at the end of each week, w, can be expressed at A(w) = 20w + 300. The amount of money that Sam will have at the end of each week, w, can be expressed at S(w) = 15w + 400. They hav...

**math**

What is 43 over 15

**Science**

Can you explain tectonic plates?

**Physics**

Ocean waves pass through two small openings in a breakwater. This time the openings are d = 21 m apart. You're in a small boat on a perpendicular line midway between the two openings, L = 80 m from the breakwater. You row x = 32 m parallel to the breakwater and find yourse...

**PLEASE HELP!! DESPERATE!!! (MATH)**

The derivative of a function is f'(x)=x(x+2)(x-5). Find the value of x at each point where f has a (a) local maximum, (b) local minimum, or (c) point of inflection

**Math**

The derivative of a function is f'(x)=x(x+2)(x-5). Find the value of x at each point where f has a (a) local maximum, (b) local minimum, or (c) point of inflection

**Math**

For y= (3x)/(2e^x+e^-1), use graphing techniques to find the approximate intervals on which the function is: a) increasing b) decreasing c) concave up, d) concave down then find any e) local extrema f) inflection points

**Math**

Thank you :)

**Math **

A runner is 22 km east and 15 km south of his starting point, how long would it take him to return to his starting point in a direct Line if he can run at 10 km per hour?

**Math**

Yes Steve I did @ first get 2.66 can u help me?

**Math**

I got 2 hrs and 40 mins approximately right?

**Math**

So I just round it ? Yep thanks

**Math**

Btw related to the question I asked: how long would it take him to return to his starting point in a direct line if he can run at 10 km per hour?

**Math**

Thank you so much ! :D

**Math **

A runner is 22 km east and 15 km south of his starting point. How far is he in a direct line from his starting point?

**Physics**

A 1.9 kg ball is attached to a ceiling by a string. The distance from the ceiling to the center of the ball is 1.13 m, and the height of the room is 3.00 m. (a) What is the gravitational potential energy associated with the ball relative to the ceiling? J (b) What is the gravi...

**Physics**

An object with a weight of 30 newtons is placed on a flat, level surface. What is the normal force that the surface pushes on the object with?

**Math**

Another way to write 44n would be 44 x n because you are multiplying 44 by n, not dividing them.

**Fractions**

I'm pretty sure it would have traveled 18.5 miles. Try drawing it out on a graph (7.5 down, 3.5 right, etc.). Then add up all the distances it traveled right up to where it reaches a position where it already went. Hope this makes sense.

**Math- Calculus**

Locate the absolute extrema of the function on the closed interval: y= 4/x+tan(pix/8), [1,2]

**Math**

First you have to find the derivative of g(x). Then set that equal to 0 and solve for the value(s) of x. Then plug your critical #'s into the original equation. The largest # will be your relative max and the smallest # will be the relative min.

**Statistics **

Let’s suppose a randomly selected sample of 75 American teenagers watches an average of 1472 hours of television per year with a standard deviation of 250 hours. Construct the 95% confidence interval (CI) for the mean number of hours American teenagers watch television pe...

**MATH**

mark scores 6 points. amy scores 11 points. how many points does mark need to tie the game? WRITE A NUMBER SENTENCE TO SOLVE. THANK YOU

**MATH**

mark scores 6 points. amy scores 11 points. how many points does mark need to tie the game? WRITE A NUMBER SENTENCE TO SOLVE. THANK YOU

**Physics- Projectiles**

A marlin jumps out of the water with an initial velocity of 5.0 meters per second at an angle of 80 degrees above horizontal. Approximately what maximum height will the marlin reach during it's flight?

**physics**

A person wants to push a lamp (mass 7.2 kg) across the floor, for which the coefficient of friction is 0.23. Calculate the maximum height above the floor at which the person can push the lamp so that it slides rather than tips (Fig. 9-62).

**AP Chemistry**

Consider the following reaction. CaSO4(s) Ca2+(aq) + SO42-(aq) At 25°C the equilibrium constant is Kc = 2.4 10-5 for this reaction. (a) If excess CaSO4(s) is mixed with water at 25°C to produce a saturated solution of CaSO4, what are the equilibrium concentrations of C...

**physics**

a place kicker must kick a football from a point 32.0 m from the goal. As a resultof the kick, the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 23.0 m/s at an angle of 53 degrees to the horizontal. To determine if ...

**AP Physics C**

when a block is pulled out to x=+4.0cm, we must apply a force amgnitude 360N to hold it there. we pull the block to x=11cm and then realease it. how much work does the spring do on the block as the block moves from xi=+5.0cm to a)x=+3.0cm, b)x=-3.0cm, c)x=-5.0cm, d)x=-9.0cm?

**Science**

Thank You

**Science**

What is the basic unit for volume?

**Algebra II**

Factor: 18x^2-33x+9

**Algebra II**

Group factor: x^2+2x^2+x+2

**Algebra II**

Factor: 12a^2-17a-5

**calculus and physics**

An explosion causes debris to rise vertically with an initial velocity of 75 ft/sec. a. In how many seconds does it attain maximum height? b. What is the maximum height? c. What is the speed of the debris as it reaches 12 ft on the way back to the ground? d. What is the veloci...

**calculus and physics**

An explosion causes debris to rise vertically with an initial velocity of 75 ft/sec. a. In how many seconds does it attain maximum height? b. What is the maximum height? c. What is the speed of the debris as it reaches 12 ft on the way back to the ground? d. What is the veloci...

**math**

The rectangular part of her pool is 8 meters by 6 meters. The triangular part has a height of 4 meters and a base of 5 meters. what is the area of the pool cover sally will buy

**Refined graines**

The enriching process for refined grains adds back: a:folic acid b: thiamin & niacin c:iron d: all of the above

**Whole grains and refined graines**

I think it's true but not sure

**Whole grains and refined graines**

Whole grains or food food made from them,contain all the essential parts and naturally-occurring nutrients of the entire grain seed. True or false

**art**

The Visual Elements: "Street, Dresden", 1907, oil on canvas by Ernst Ludwig Kirchner Describe the shapes in this painting. Are the shapes organic or geometric? Which ones? Describe how the shapes interact, or "touch" each other. Are the edges of the shapes ...

**Observing development of the young chilld**

Thank u:-)

**Observing development of the young chilld**

I think the answer is c I'm just trying to make sure

**Observing development of the young chilld**

After making a field trip to an animal farm or zoo it's a good idea to place toy animals and other similar props in the dramatic play learning center in the classroom. The main purpose of doing this is the children to A, learn to say and spell the names of different B, enh...

**Observing development of the young child**

Solitary play?

**Observing development of the young child**

Dramatic play?

**Observing development of the young child**

Onlooker play?

**Observing development of the young child**

Dramatic play?