Sunday

December 21, 2014

December 21, 2014

Total # Posts: 553

**chemistry**

what's the T Kb what would the molality be plugged in for the equation
*May 13, 2013*

**chemistry **

a sample of 15.00 g of an unkown metal chloride, MCl2 is dissolved in 75.0 mL water. the boiling point of the resulting solution is measured at 102.37 degrees C. what is the identity of the metal M.
*May 13, 2013*

**Physics**

A ray of light of vacuum wavelength 550 nm traveling in air enters a slab of transparent material. The incoming ray makes an angle of 34.3◦ with the normal, and the refracted ray makes an angle of 18.9◦ with the normal. Find the index of refraction of the ...
*May 6, 2013*

**Math**

What is the dollar amount for the cement needed for a sidewald that is 4 inches thick, 3 feet wilde, and 40 feet long if the cement is sold for $76 petr cubic yard. Calculate the problem using fractions to avoid rounding errors caused by repeating decimals.
*May 6, 2013*

**Stat**

A student takes a 10-question true-false and randomly guesses the answer to each question. Suppose a correct answer is worth 1 point, an incorrect answer is worth -.5 points. Find the probability the student gets 7 or more points.
*May 4, 2013*

**math (Algebra)**

I was wondering if someone can help me with this question ,please... (2r5+r3)^2 r=radical
*May 1, 2013*

**.MATH.**

If about 3000 of every recall model of a vehicle actually need rework, what is the probability that your (recalled) car will not need a rework if there are 120000 cars of that model sold, and if 1000 of them are already off the road (this is a monkey wrench!). State your ...
*April 30, 2013*

**Math**

a 2-month note for $4,500 was drawn on July 3 at 8%. If money is worth 9%, find the present value of the note on the day it was made.
*April 30, 2013*

**geometry**

you plan to carpet 468ft of space. carpet costs $26.75 per square yard and the tax is 7%. the carpet is sold in 12 ft rolls. what is the cost of the carpet?
*April 25, 2013*

**geometry**

the bore of an engine cyclinder is the diameter of the piston and the stroke is the distance that the piston will travel up the cyclinder wall. The displacement is the volume of space that the piston goes thru. If the piston is 3.97" in dia. and the stroke is 4" what...
*April 25, 2013*

**please help geometry**

you need to find the length of a broken automitive belt. the belt ran around 2 pulleys whose centers were 11 in apart. one of the pulleys is 4" dia. and the other is 6" dia. what is the totoal length of the belt needed to connect thr pulleys?
*April 25, 2013*

**geometry**

how many 3"x4"x6" boxes will fit in a 2'x3'x8' container?
*April 25, 2013*

**bonds**

YOU WANT TO BUY A TREASURY BILL WHOSE FACE VALUE IS $20000 IN 30 DAYS. THE INTEREST RATE IS 4.61%. HOW MUCH WILL YOU HAVE TO PAY FOR THE BILL?
*April 11, 2013*

**7th grade math/ geometry**

a costruction crew is repairing a 201 foot long section of a highway. The road is 8 feet wide and the concrete must be poured to the depth of 6 inches. How many cubic feet will be required for the repair?
*April 8, 2013*

**Life orientantion**

Describe 5 factors of Hiv
*April 8, 2013*

**algebra**

To balance a seesaw, the distance, in feet, a person is from the fulcrum is inversely proportional to the person's weight, in pounds. Peter, who weighs 150 pounds, is sitting 3 feet away from the fulcrum. If Joey weighs 90 pounds, how far from the fulcrum should he sit to ...
*April 7, 2013*

**Math**

The weather forecast states that there is a 70% chance of rain tomorrow. Which of the "definitions" of probability is relevant to this statement and explain why?
*April 6, 2013*

**Math**

I get it , Thanks for everything
*April 6, 2013*

**Math**

Or could be 3√5/4*3 = 6√5.
*April 6, 2013*

**Math**

Thank you for your answer but I was thinking that the answer will be √9.5/12 then 3√5/12 and I do not know what to do with the denominator "12".
*April 6, 2013*

**Math**

Simplify the expression (square root) √45/144 Thanks.
*April 6, 2013*

**Physics**

A spring with a spring constant of 35.0 N/m is attached to diﬀerent masses, and the system is set in motion. What is the period for a mass of 34 g? Answer in units of s
*April 2, 2013*

**Physics**

A spring with a spring constant of 35.0 N/m is attached to diﬀerent masses, and the system is set in motion. What is its period for a mass of 2.4 kg? Answer in units of s
*April 1, 2013*

**Chemistry**

Find the Qsp when 9 drops of 0.014 M Na2CO3(aq) are added to 25 mL of 0.003 M AgNO3(aq). The solubility product of Ag2CO3 is 6.2 × 10−12. Assume 20 drops per milliliter.
*March 30, 2013*

**Math**

47 Fahrenheit = Celsius give answer in decimal form, to the nearest tenth?
*March 28, 2013*

**Geometry**

The length of one base of a trapezoid is 19 inches and the length of the median is 16 inches. Find the length of the other base.
*March 22, 2013*

**Geometry**

Abcd is an isosceles trapezoid with a(10,-1) b(8,3) and c(-1,3). Find the coordinates of d
*March 22, 2013*

**Geometry**

Thank you so much!
*March 21, 2013*

**Geometry**

For diagonals of square Abcd intersect at e . If ae =2x+6 and bd =6x-10 find ac
*March 21, 2013*

**Chemistry**

How many moles of NaCl are in 2.00mL of 1.00M NaCl?
*March 21, 2013*

**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.
*March 18, 2013*

**Chemistry**

A solution has a mass of 95.00g and a density of 2.147 g/mL. What is the volume of the solution?
*March 14, 2013*

**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 ...
*March 6, 2013*

**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...
*March 6, 2013*

**RATIOS**

10.6 PESO IS $1 US DOLLAR. YOU HAVE 2500 PESO. YOU WANT TO EXCHANGE TO US DOLLAR. HOW MANY WOULD YOU GET?
*February 24, 2013*

**RATIOS**

A MODEL TRAIN IS 1;48 ON SCALE. THE ENGINE IS 13 5/8 INCHES. HOW MANY FEET IS THE ACTUAL ENGINE?
*February 24, 2013*

**Math **

Write the following complex number in polar form: z = 4 − 4i
*February 23, 2013*

**maths**

alissa is33 years old jacj is three times alyssa's age. How old are Jack and alyssa altogether?
*February 15, 2013*

**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 ?
*February 11, 2013*

**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?
*February 10, 2013*

**MATH**

find a counterexample to prove the following is false: x is less than or equal to 2x
*February 10, 2013*

**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?
*February 8, 2013*

**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?
*February 7, 2013*

**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?
*February 7, 2013*

**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 ...
*February 4, 2013*

**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...
*February 4, 2013*

**mathematics**

Mr. Collins is buying trsin tickets for $42 each. What is the total cost of the tickets? Use the distributive property to solve.
*December 22, 2012*

**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...
*December 12, 2012*

**Chemistry**

What is the density of 3.40 liters of hci
*December 11, 2012*

**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?
*December 7, 2012*

**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-...
*December 5, 2012*

**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: ...
*December 5, 2012*

**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 ...
*December 4, 2012*

**social studies**

What is the population of:Nile Valley,Ganges Valley and Eastern China
*December 3, 2012*

**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
*December 2, 2012*

**Math**

H(t) = 0.013t^2 + 0.81t + 316 + 3.5 sin 2πt Ah, the formula should have an exponent!
*December 2, 2012*

**Math**

The formula should actually be: H(t) = 0.013t2 + 0.81t + 316 + 3.5 sin 2πt
*December 2, 2012*

**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 ...
*December 2, 2012*

**Math**

how did you determine the maximum and the minimum?
*December 1, 2012*

**Math**

NOTE - the formula should be: H(t) = 0.013t^2 + 0.81t + 316 + 3.5 sin 2πt
*December 1, 2012*

**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...
*December 1, 2012*

**Math**

Could someone explain what each part of this formula represents? H(t) = 0.058t^2 + 0.41t + 516 + 2.5 sin(2π)(t)
*November 30, 2012*

**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
*November 21, 2012*

**world geography**

According to the Ministerial Conference on the Protection of Forests in Europe (MCPFEs), sustainable forest development is defined by these three criteria.
*November 20, 2012*

**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 ...
*November 19, 2012*

**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 ...
*November 16, 2012*

**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?
*November 15, 2012*

**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...
*November 15, 2012*

**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?
*November 3, 2012*

**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?
*November 3, 2012*

**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 )
*November 3, 2012*

**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.
*November 1, 2012*

**physics**

2.33
*October 25, 2012*

**science**

how are the stone henge and cubi series alike?
*August 31, 2012*

**Calc **

Find the second derivative of the function. f(x) = e−3x + 5e4x
*July 17, 2012*

**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?
*June 28, 2012*

**chinese**

1. §Ú¨S¦³ªÅ 2.ÙTÙT¡A¤U¦¸¨£ 3.¶Ù¡A§A¦n¶Ü? 4.¤£n¥´ÂZ§Ú¡A§Ú¦bÅª®&...
*June 17, 2012*

**physics question**

What is a magnetic field, and what is its source?
*May 16, 2012*

**physics question**

Every spinning electron is a tiny magnet. Since all atoms have spinning electrons, why are not all atoms tiny magnets?
*May 16, 2012*

**physics question**

Why do some pieces of iron behave as magnets, while other pieces of iron do not?
*May 16, 2012*

**physics question**

Why will dropping or heating a magnet weaken it?
*May 16, 2012*

**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.)
*May 16, 2012*

**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 ...
*May 16, 2012*

**physics**

What is the primary difference between an electric motor and an electric generator?
*May 16, 2012*

**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?
*May 11, 2012*

**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?
*May 11, 2012*

**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?
*May 11, 2012*

**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
*May 11, 2012*

**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
*May 11, 2012*

**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?
*April 13, 2012*

**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
*April 7, 2012*

**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 ...
*April 7, 2012*

**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+
*March 28, 2012*

**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?
*March 21, 2012*

**alg2trig**

2(3y-4)^(3/5)-4=50
*March 11, 2012*

**alg2trig**

16log4^1/64=x
*March 8, 2012*

**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 ...
*February 6, 2012*

**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
*January 22, 2012*

**math116**

solve using the multiplication principle, -4x>1/11
*January 22, 2012*

**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 ...
*January 20, 2012*

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