# Posts by Alice

Total # Posts: 730

**Chemistry**

How many moles of NaCl are in 2.00mL of 1.00M NaCl?

**math**

A basket contains 15 red numbered balls and 10 white numbered balls. A sample of five balls is selected. How many samples contain three red balls and two white balls? Explain your answer.

**Chemistry**

A solution has a mass of 95.00g and a density of 2.147 g/mL. What is the volume of the solution?

**Physics**

A proton moves eastward in the plane of Earth’s magnetic equator so that its distance from the ground remains constant. What is the speed of the proton if Earth’s magnetic ﬁeld points north and has a magnitude of 5.2 × 10−5 T? The acceleration of ...

**Physics**

A proton moves eastward in the plane of Earth’s magnetic equator so that its distance from the ground remains constant. What is the speed of the proton if Earth’s magnetic field points north and has a magnitude of 5.2 × 10−5 T? The acceleration of gravity...

**RATIOS**

10.6 PESO IS $1 US DOLLAR. YOU HAVE 2500 PESO. YOU WANT TO EXCHANGE TO US DOLLAR. HOW MANY WOULD YOU GET?

**RATIOS**

A MODEL TRAIN IS 1;48 ON SCALE. THE ENGINE IS 13 5/8 INCHES. HOW MANY FEET IS THE ACTUAL ENGINE?

**Math**

Write the following complex number in polar form: z = 4 − 4i

**maths**

alissa is33 years old jacj is three times alyssa's age. How old are Jack and alyssa altogether?

**chemistry**

what is the specific heat of copper if the temperature of a 100g sample of copper is increased by 23C when 886J of heat is added ?

**MATH**

a car dealer sells a car with the following options: auto or manual transmission,standard or deluxe stereo,air or no air, manual or power locks, 15 or 16 inch tires, fabric or leather seats. how many different configurations can this car be sold in?

**MATH**

find a counterexample to prove the following is false: x is less than or equal to 2x

**MATH**

heres my equation: c(coat)+s(shirt)+t(tie)=$300 c=2s s=2t+40 i need to know how to solve this to get the cost of each item?

**math**

a coat,shirt and tie cost $300. coat costs twice as much as the shirt. shirt cost $40 more than twice the cost of the tie. what are the cost of each item?

**math**

a florist has 9 dozen roses. all are either red or white. he has 44 more red than white, how many white roses does he have?

**chem**

If 20.5 mL of a 5.256 M solution of benzoic acid is used in an experiment similar to experiment 4, how many grams of benzoic acid is in the starting solution? (molar mass of benzoic acid = 122.12 g/mol) Be sure to pay attention to significant figures. The answers are all in ...

**chem**

What does the concentration of the benzoic acid in the original liquid and the extracting liquid relate to after the extraction is completed? Answer a. The density of the original liquid. b. The density of the extracting liquid. c. The solubility of benzoic acid in each liquid...

**mathematics**

Mr. Collins is buying trsin tickets for $42 each. What is the total cost of the tickets? Use the distributive property to solve.

**Physics**

A 4.2 × 10^3 kg car accelerates from rest at the top of a driveway that is sloped at an angle of 18.4◦ with the horizontal. An average frictional force of 4.1×10^3 N impedes the car’s motion so that the car’s speed at the bottom of the driveway is 4...

**Chemistry**

What is the density of 3.40 liters of hci

**Physics**

A spring has a a constant of 650 N/m. How far must it be compressed to push a 4kg object on a friction-less surface to 3 m/s?

**Math**

This is from the actual problem - A consumer product testing lab tested 400 13-watt compact fluorescent light bulbs by turning them all on at once, leaving them on until they burned out, and recording the time-to-failure of each bulb. The test revealed a symmetric and mound-...

**Math**

What is the approximate percentile rank of a lightbulb that failed at 9000 hours if the number of lightbulbs is 400? The number of lightbulbs that lasted between 5400 and 9000 were about 326 lightbulbs. The mean is 7800 and the standard deviation is 1200 My guess was: ...

**Math**

The amount of a monthly electric bill (B, measured in $) depends on the amount of electricity used that month (E, measured in kWh). A typical public utility charges $0.12 per kWh for the first 300 kWh used, $0.17 per kWh for the next 600 kWh used, and $0.29 per kWh for any ...

**social studies**

What is the population of:Nile Valley,Ganges Valley and Eastern China

**Math**

ah, thanks... i'm only taking "liberal arts math", so have only done a little bit of calculus. how did you get this part? H(.2559) = appr 319.7 H(.744) = appr 312.7

**Math**

H(t) = 0.013t^2 + 0.81t + 316 + 3.5 sin 2πt Ah, the formula should have an exponent!

**Math**

The formula should actually be: H(t) = 0.013t2 + 0.81t + 316 + 3.5 sin 2πt

**Math**

Could someone explain how to find which months during the year the maximum/minimum points occur for this problem occurs? I think it's around May and Oct, but I don't get how to determine that on the graph The National Oceanic and Atmospheric Administration (NOAA) has ...

**Math**

how did you determine the maximum and the minimum?

**Math**

NOTE - the formula should be: H(t) = 0.013t^2 + 0.81t + 316 + 3.5 sin 2πt

**Math**

Could someone explain how to solve this math problem? I've graphed it, but I'm not sure how to solve the rest of the questions. The National Oceanic and Atmospheric Administration (NOAA) has been measuring atmospheric carbon dioxide concentations (in parts per million...

**Math**

Could someone explain what each part of this formula represents? H(t) = 0.058t^2 + 0.41t + 516 + 2.5 sin(2π)(t)

**chemistry**

What percentage of the Ba2+ in solution is precipitated as BaCO3(s) if equal volumes of 2.4*10^-3 M Na2CO3(s) and 1.1*10^-3M BaCl2(aq) are mixed

**world geography**

According to the Ministerial Conference on the Protection of Forests in Europe (MCPFEs), sustainable forest development is defined by these three criteria.

**EARTH SCIENCE**

You are given a 6-month assignment by your employer to work at a remote location in Australia. In order to pack as lightly as possible, you try to research the climate of a small town in Australia. There is little data since no major cities are located within 300 miles of the ...

**Physics**

Three blocks are in contact with each other on a frictionless horizontal surface. A 417 N horizontal force is applied to the block with mass of 3.7 kg as shown in the ﬁgure below. The acceleration of gravity is 9.8 m/s^2. (the picture looks like this) F *----->[3.7 ...

**arithmetic**

If you have 3.14 lbs of a food and it costs .88 a lbs. then how much money would that 3.14 cost?

**physics**

A block of mass 3.62 kg lies on a frictionless horizontal surface. The block is connected by a cord passing over a pulley to another block of mass 7.8 kg which hangs in the air, as shown. Assume the cord to be light (massless and weightless) and unstretchable and the pulley to...

**Physics**

An ant on a picnic table travels 40 cm eastward, then 25 cm northward, and finally 15 cm westward. What is the ant's directional displacement relative to its original position?

**Physics**

An ant on a picnic table travels 40 cm eastward, then 25 cm northward, and finally 15 cm westward. What is the ant's directional displacement relative to its original position?

**Physics**

A ferry is crossing a river.The ferry is headed due north with a speed of 2.5 m/s relative to the water and the river's velocity is 2.0 m/s to the east. What is the magnitude and direction of the ferry's velocity relative to Earth. ( Give the angle from east 0 degrees )

**5th grade math**

Madmistro, your idea with the diagram is great but you will be planting two tulips in the starting position. Therefore, I think that subtract 1 which yields 19 is the better answer. Although it did not say that 2 tulips could not be planted in the same hole.

**physics**

2.33

**Maths**

45

**science**

how are the stone henge and cubi series alike?

**Calc**

Find the second derivative of the function. f(x) = e−3x + 5e4x

**Trigo**

Two men travelling in opposite directions at the rate 18 and 22 miles per hour respectively started at the same time from the same place. In how many hours will they be 250 miles apart?

**chinese**

1. §Ú¨S¦³ªÅ 2.ÙTÙT¡A¤U¦¸¨£ 3.¶Ù¡A§A¦n¶Ü? 4.¤£n¥´Z§Ú¡A§Ú¦bÅª®Ñ...

**Chemistry**

Moles Fe = 209.7 g / 55.847 = 3.75 the ratio between CO and Fe is 3 : 2 Moles CO needed = 3.75 x 3 / 2 = 5.63 Mass CO = 5.63 mol x 28.01 g/mol =157.7 g

**physics question**

What is a magnetic field, and what is its source?

**physics question**

Every spinning electron is a tiny magnet. Since all atoms have spinning electrons, why are not all atoms tiny magnets?

**physics question**

Why do some pieces of iron behave as magnets, while other pieces of iron do not?

**physics question**

Why will dropping or heating a magnet weaken it?

**physics**

Pigeons have multiple-domain magnetite magnets within their skulls that are connected through a large number of nerves to the pigeon's brain. How does this aid the pigeon in navigation? (Magnetic material also exists in the abdomens of bees.)

**physics opinion**

A common pickup for an electric guitar consists of a coil of wire around a permanent magnet. The permanent magnet induces magnetism in the nearby guitar string. When the string is plucked, it oscillates above the coil, thereby changing the magnetic field that passes through ...

**physics**

What is the primary difference between an electric motor and an electric generator?

**physics**

Calculate the cost of operating a 65 W light bulb continuously for a 30-day month when electrical energy costs $0.23/kW·h. $ 1 How do you calculate cost? whats the equation?

**physics**

A color television has a power rating of 325 W. How much current does this set draw from a potential difference of 120 V? 1 . A i got 2.42 but its wrong?

**physics**

How much charge passes through a cross-sectional area of a copper wire in 0.8 s if I = 3.5 A? 1 C -Work equation?

**physics**

A net charge of 47 mC passes through the cross-sectional area of a wire in 19.0 s. (a) What is the current in the wire? 1 A (b) How many electrons pass the cross-sectional area in 1.0 min? 2 electrons

**physics**

A hair dryer draws a current of 9.7 A. (a) How much charge passes through the hair dryer in 3.5 min? 1 C (b) How many electrons does this represent? 2 electrons

**Accounting**

Retained earnings is 11,350

**Math**

A landscaper is choosing a compost bin. He wants it to hold exactly 12 cubic feet of compost. Using whole numbers only, how many different sizes can he choose from?

**Physics**

A −5 × 10−6 C charge is brought from a very distant point by an external force and placed at the origin. Calculate the magnitude of the electric force on this charge. Answer in units of N

**Physics**

Charge 2 × 10−18 C is on the y axis a distance 4 m from the origin and charge 9 × 10−18 C is on the x axis a distance d from the origin. What is the value of d for which the x component of the force on 9 × 10−18 C is the greatest? The ...

**Chemistry**

No, I did the same online quiz and CH3NH3+ is not correct. Weakest aicd will be least reactive, that means it will have larger concentration, in this CH3NH3+ and NH3OH+ are functioning as acids, CH3NH3+ is 95%. so the strongest acid should be NH3OH+

**Basic Chemistry**

The density of a 40.0% by weight aqueous solution of NaOH is 1.432 g/cm3 what is the molarity of NaOH?

**alg2trig**

2(3y-4)^(3/5)-4=50

**alg2trig**

16log4^1/64=x

**Physics**

A train at a constant 41.0 km/h moves east for 38 min, then in a direction 44.0° east of due north for 25.0 min, and then west for 59.0 min. What are the (a) magnitude (in km/h) and (b) angle (relative to north, with east of north positive and west of north negative) of ...

**alg2/trig**

1)3x^2-12x-21 solve by completing the square in simplest radical form 2) (1/x+3)-(2/3-x)=(4/x^2-9)find values of x 3)3/radical(3a^2b^4) is equivalent to 4) factor completely 27x^-75x^4

**math116**

solve using the multiplication principle, -4x>1/11

**Business**

1. What effect would the following actions have on a firm’s current ratio? Assume that new working capital is positive. a. A short term bank loan is repaid. b. A long-term debt is paid off early. For a, would the current ratio move away from 1. For b, would the current ...

**sociology- social work**

What influences in your life draw you to work with older adults? What do you anticipate will be a rewarding aspect of this work? What might be a challenge? What do others you speak to say when you indicate that you are interested in working with older adults?

**sociology**

What areas of social services, business and industry could benefit from the expertise and skills of a trained gerontological social worker?

**Math**

For 1985 through 1996, the number, C (in thousands), of videos rented each year in Moose Jaw can be modeled by C= 0.069(t^3+4t^2+37t+600) where t=0 represents 1990. During which year are 60.4 thousand movies projected to be rented? I'm not sure how to solve this problem. ...

**Algebra 2**

For 1985 through 1996, the number, C (in thousands), of videos rented each year in Moose Jaw can be modeled by C= 0.069(t^3+4t^2+37t+600) where t=0 represents 1990. During which year are 60.4 thousand movies projected to be rented? Could someone please show me the steps to ...

**Chemistry**

A sealed balloon is filled with 1.20 L of helium at 23°C and 1.00 atm. The balloon rises to a point in the atmosphere where the pressure is 250. torr and the temperature is -27°C. What is the change in volume of the balloon as it ascends from 1.00 atm to a pressure of ...

**Math**

Divide the sum of x^2+4x-1 & 2x-2 by -3x^4

**math**

Thanks!

**math**

Base of a triangle is 12 inches longer than twice the length of altitude x. Write polynomial area of triangle.

**U.S. History**

Tank you very much for your help.:) actually my teacher hasn't pointed anything out since I don't have one. My younger brother and I are home-schooled.

**U.S. History**

By the way Google is currently not working on my computer, so if your going to give me search sites please use Bing

**U.S. History**

Traces the creation of the American government from Ancient Greece to Shay's rebellion. What am I supposed to do???

**Spanish Fun**

Sorry that probably didn't make sense. How do you say halloween in Spanish???

**Spanish Fun**

Isn't "Halloween" still "Halloween" in Spanish

**Social Studies-Amrican History**

Happy Halloween!

**Social Studies-Amrican History**

(:Thanks:)

**Social Studies-Amrican History**

What were some of the first calls of independence ffrom the colonists??? I've got a few: Join or Die Unite or Die Don't tread on me Give me librty or give me Death ......

**Social Studies-Amrican History**

What day was the stamp act announced?

**Social Studies-Amrican History**

British Taxes - The student will evaluate the cause and effect relationship of British tax policies concerning the colonies. In March 1765, the British parliament announced a stamp tax. Starting that November, American colonists would be charged taxes on multiple printed ...

**U.S. History**

Thank you very much. :)

**U.S. History**

OH and if you can see that we're posting from the same computer, can you see where we live?

**U.S. History**

Alright.. I think that some of the reasons were that the British and the french wanted the same land. And the British are trying to take over the Frencc fur trading Buisness. He thinks that the Britsh were mad at the colonies for moving past the alpachian mountains.... Who is ...

**U.S. History**

I'm not swithching names, that's my brother. We're both homeschooled but we share the same computer. My parent can't afford 2.

**U.S. History**

Do you have any specific sites. I already did those things. I have LITERALY been trying to answer these questions for 4 hours and 17 minutes.

**Spanish**

The house of orphans of Lima was founded in 1597 by Luis Ojeda the Sinner, under the patronage of Our Lady of Atocha. Charitable prompting the man to take care of foundlings was to have found in the atrium of Mercy the body of a creature almost devoured by dogs. Scribes Asoci&...

**Finance**

5. John and Daphne are saving for their daughter Ellen's college education. Ellen just turned 10 (t=0), and she will be entering college 8 years from now (at t=8). College tution and expenses at State U. are currently $14,500 a year, but they are expected to increase at a ...

**Finance**

Steve and Ed are cousins who were both born on the same day, and both both turned 25 today. Their grandfather began putting $2,500 per year into a trust fund for Steve on his 20th birthday, and he just made a 6th payment into the fund. The grandfather (or his estate's ...