Monday
December 22, 2014

Posts by Michelle


Total # Posts: 1,670

math
Earth's mass, in kilograms, is 5.97x10^24. the moon's mass is 7.34x10^22. How many times greater is Earth's mass (in scientific notation)?
March 14, 2013

Math
A backpacking team is hiking At an average speed of 2 1/2 miles per hour. At that rate, how long will it take for a hike of 8 3/4 mi?
March 8, 2013

Math
55 1/2
March 8, 2013

Math
Karina earned $60 from her part time job. She spent 3/10 of it on food and 1/4 of it on music. How much money does she have left?
March 8, 2013

Math
32
March 8, 2013

Math
A DVD case is 9/16 in. Thick. How many of these cases will fit on a shelf that is 1 1/2 ft wide
March 8, 2013

Math
A DVD case is 9/16 in. Thick. How many of these cases will fit on a shelf that is 1 1/2 ft wide?
March 8, 2013

Math
A new section of freeway will be 8 1/2 mi long. During the first month of construction, 2 7/10 mi were built. During the second month, 3 3/5 mi were built. How many more miles were left to build?
March 8, 2013

Math
2 1/5
March 8, 2013

Math
6 2/5
March 8, 2013

Math
Mr.Quakers science class has a 16 gallon aquarium that is 3/5 full. How much water is needed to fill it?
March 8, 2013

Business Statistics
1.  Suppose that the mean of the annual return for common stocks from 1950 to 2012 was 9.4%, and the standard deviation of the annual return was 17.5%.  Suppose also that during the same 62-year time span, the mean of the annual return for long-term government bonds ...
March 6, 2013

Chemistry
Ammonia is used as a fertilizer throughout the world. It is often produced by reacting nitrogen gas with hydrogen gas in a synthesis reaction. How much ammonia in grams can be produced from 9207 grams of nitrogen and 44 000 L of hydrogen?
March 4, 2013

Chemistry
Answer had to be expressed as just as an isotope so it is **108/48Cd DrBob222 Can you explain how you got the 48 though? Where did the other proton come in when you just added to the mass?
March 1, 2013

Chemistry
I was thinking of something like this? (I'm not sure how to approach this problem): 108/47Ag ---> 107/47Ag + 1/0n then, 108/46Pd ---> 108/47Ag + 0/-1e
March 1, 2013

Chemistry
When silver-107 is bombarded with a neutron, a different isotope of silver forms and then undergoes beta decay. What is the final product? (My Hints: Write two separate nuclear equations.)
March 1, 2013

Chemistry
**241/95Am ----> 237/93Np + 4/2He Is the correct answer indeed. I was confused about the part where it was just talking about subatomic particles and thought I wasn't adding an element to balance the equation but neutrons. Thank you!
March 1, 2013

Chemistry
There are several technological applications for the transuranium elements (Z > 92). An important one is in smoke detectors, which can use the decay of a tiny amount of americium-241 to neptunium-237.What subatomic particle is emitted from that decay process? Write a ...
March 1, 2013

Chemistry
75.7 days
March 1, 2013

Chemistry
Radium-223 has a half-life of 11.4 days.Approximately how long would it take for the activity of a sample of Radium-223 to decrease to 1.00% of its initial value?
March 1, 2013

Pre-Calculus
The stopping distance D of a car after the brakes have been applied varies directly as the square of the speed s. A certain car traveling at 70 mi/h can stop in 343 ft. What is the maximum speed it can be traveling if it needs to stop in 160 ft?
February 26, 2013

college physics
You are in the lab with a 10 V battery. You have a 10 W light bulb and you want to put 0.75 A of current through the light bulb and 7.5 V across the light bulb. This will allow the light bulb to have a brightness proportional to 5.625 W. Assuming any resistors that you need, ...
February 26, 2013

Math
Denna bought a bag of jelly beans. 1/3 are pink and 1/6 are blue. The rest are green. How many are green?
February 25, 2013

Physics
A thundercloud has an electric charge of 43.2 C near the top of the cloud and -38.7 C near the bottom of the cloud. The magnitude of the electric force between these two charges is 3.95 x 106 N. What is the average separation between these charges? (kc = 8.99 ×109 N &#...
February 20, 2013

math
gfrtyyngjtfghdyhjhv ndfhd,bbgrtf
February 18, 2013

Math
If the product of four tenths and six tenths is subtracted from the sum of four tenths and six tenths, what is the difference?
January 30, 2013

math 121
jennifer is asked to complete 5 of the 7 essay questions on her literature exam how many choices does jennifer have?
January 28, 2013

Engineering Math
sorry didn't mean to lol but it is lol
January 28, 2013

Engineering Math
lol
January 28, 2013

physics
Suppose a 28.5 kg object is moving at 38.4 m/s along the x-axis just before it strikes a stationary 13.0 kg object. After the collision, the 28.5 kg object is moving with a velocity of 20.0 m/s at an angle of 5.79 degrees relative to the x-axis. What is the magnitude of the ...
January 25, 2013

Chemistry
What is the density, in grams per liter, of N subscript 2 gas at STP
January 24, 2013

General math
7t-6=104
January 24, 2013

mt450
need to focus on the main critical elements of simulation
January 22, 2013

mt450
Now that you have turned in your Simulation Final Project paper, the next step is to turn in your PowerPoint presentation of it. In the workplace, presentations like this play a key part in conveying marketing plans. Presentation requirements: • A minimum of 8 slides and ...
January 22, 2013

Algebra
Thanks. I figuired out the working, but not sure how to use the Let statement. Would it be correct to say Let A = original scholarship amount A = 1-1/3 -1/4-1/4 x72,000 A = 1/6 x 72 = 432,000
January 10, 2013

Algebra
Mary, Margaret, Ron and Nick are to share a sholarship. Ron receives 1/3 of the scholarship; Nick gets 1/4 of the scholarship; Mary receives the same as Nick, and Margaret receives $72,000. Find each person's share in the scholarship as well as the original scholarship ...
January 10, 2013

literature
In "Life without Principle," Thoreau writes, "If my wants should be much increased, the labor required to supply them would become a drudgery." What does this statement mean?
December 12, 2012

Chemistry
If 355 g Al(NO3)3 reacts with an excess of K2CrO4, how many moles of KNO3 would be produced?
December 12, 2012

chemistry
3.50 mol Al(NO3)3 reacts with 5.00 mols K2CrO4, the total number of moles of Al2(CrO4)3 and KNO3 would be? Here is the equation if it's needed. 2 Al(NO3)3(aq) + 3 K2CrO4(aq) → Al2(CrO4)3(s) + 6 KNO3(aq)
December 12, 2012

Chemistry
How many atoms of O are in 4 moles of (NH4)3PO4 - 6H2O? The answer is 2.41x10^25 I have no clue how to arrive at this answer.
December 11, 2012

Mathematics of Retailing
An owner of a laundry shop received an invoice for purchasing 200 bottles of liquid detergent at RM15 each, and 300 bottles of fabric softener at RM8 each. The invoice dated on 6th August 2010. He was offered trade discount 10% and 8%, with cash discount 10/10, 5/20, n/30. The...
December 9, 2012

physics! please help!!
A particle rotates counterclockwise in a circle of radius 6.5 m with a constant angular speed of 7.4 rad/s. At t = 0, the particle has an x coordinate of 3.3 m and y > 0 . A) Determine the x coordinate of the particle at t = 0.716 s. Answer in units of m ( I know this ...
December 6, 2012

physics
A particle rotates counterclockwise in a circle of radius 6.5 m with a constant angular speed of 7.4 rad/s. At t = 0, the particle has an x coordinate of 3.3 m and y > 0 . A) Determine the x coordinate of the particle at t = 0.716 s. Answer in units of m ( I know this ...
December 6, 2012

physics help please!
thank you!!!!! i must have messed up on my calculations
December 6, 2012

physics help please!
The motion of a piston in an auto engine is simple harmonic. The piston travels back and forth over a distance of 23 cm, and the piston has a mass of 1.7 kg. 2515 rpm 23 cm max speed of the piston 30.28757 m/s What is the maximum force acting on the piston when the engine is ...
December 6, 2012

statistics
Scores from a statistics exam are reported as deviation scores. Which of the following deviation scores indicates a higher position in the class distribution?
December 6, 2012

physics
A 28.6-g bullet is fired from a rifle. It takes 2.36 × 10-3 s for the bullet to travel the length of the barrel, and it exits the barrel with a speed of 710 m/s. Assuming that the acceleration of the bullet is constant, find the average net force exerted on the bullet.
December 5, 2012

chemistry
just a guess but would all but C be stable?
December 4, 2012

chemistry
A magic number is the name given to certain numbers of protons or neutrons that have a high correlation to stability in nuclei. Magic # of protons: 2,8,20,28,50,82 Magic # of neutrons: 2,8,20,38,50,82,126, 184 Using general trends, predict the stability of the following nuclei...
December 4, 2012

calculus
1. (30 points) Consider a manufacturer whose total cost of producing x items is given by c(x)=10000+5x+1/9x^2. a. What is the average cost function A(x)= c(x)/x? b. How many items should the manufacturer produce in order to minimize average cost? c. What is the smallest ...
December 3, 2012

physics
An object is projected upward from the surface of the earth with an initial speed of 2 km/s. The acceleration of gravity is 9.81 m/s^2. Find the maximum height it reaches. Answer in units of km.
November 30, 2012

Math
A rectangle area spans . The length must be 20ft more than the width. What are the dimensions?
November 30, 2012

physics
Wow thank you so much! This problem has been bothering me for a week now
November 30, 2012

physics
A hydraulic brake system is shown. The area of the piston in the master cylinder is 6.32 cm^2, and the area of the piston in the brake cylinder is 1.83 cm^2. The coefficient of kinetic friction between the brake shoe and the wheel drum is 0.443. How large is the ...
November 30, 2012

Math
When rolling two dice, what is the probability that the sum is 7 given that one die is a 5?
November 29, 2012

college physics
A hydraulic brake system is shown. The area of the piston in the master cylinder is 6.32 cm^2, and the area of the piston in the brake cylinder is 1.83 cm^2. The coefficient of kinetic friction between the brake shoe and the wheel drum is 0.443. How large is the ...
November 29, 2012

chem
pH= -log [H+] pH < 7 is acidic and pH > 7 is basic. for example pH= - log [1.0e-11M] pH= 11 therefore basic solution.
November 29, 2012

physics
this is a huge help! thanks again!
November 29, 2012

physics
Wow thank you. I was really lost.
November 29, 2012

math
you deposit $2200 in an account that pays 3% interest, after 15 years you withdraw, what is the balance if the interest is compounded continuously
November 29, 2012

physics
A liquid of density 1354 kg/m^3 flows with speed 2.45 m/s into a pipe of diameter 0.29 m. The diameter of the pipe decreases to 0.05 m at its exit end. The exit end of the pipe is 7.82 m lower than the entrance of the pipe, and the pressure at the exit of the pipe is 1.4...
November 29, 2012

Chemistry
how do I convert moles of Cr2O3 to moles of H2CrO4? I don't understand what this means
November 27, 2012

Chemistry
3C3H8 + 20H2CrO4-> 9CO2 + 10Cr2O3 + 32H2O Suppose you want to make 1.50 g of chromium (III) oxide, how many ml of 6.25M chromic acid will you need to use if the percent yield of the reaction is 68.6%?
November 27, 2012

Phoenix
Why do you think Windows is so prevalent? What do the other systems have to offer that Windows does not? Who uses the other systems?
November 27, 2012

Financial management
what is the principle investment ? you have $1728.34 compounded daily at 3.4% and its invested for 9 years
November 27, 2012

math
for the equations y=5x+50 and y=6x+25, for how many hats will the cost be the same and what is that cost?
November 26, 2012

Chemistry
Sodium vapor lamps, use for public lighting, emits 489 nm yellow light. What energy is emitted by: a) an excited sodium atom when it generates a photon? b) 1 mole of excited sodium atoms at this wavelength?
November 25, 2012

Chemistry
This helped me with the amount in grams of Cr2O3, but what do I do with the 2nd part, the 35.0 ml of 6.26M chromic acid?
November 23, 2012

Chemistry
3C3H8 + 20H2CrO4-->9CO2 + 10 Cr2O3 + 32H2O What mass of chromium (III) oxide will be formed by complete reaction of 1.50g of propane with 35.0ml of 6.26M chromic acid?
November 23, 2012

Chemistry
a stock solution of perchloric acid is 75.5% perchloric acid and has a density of 1.67g/ml. What is the molarity of the solution?
November 23, 2012

math
How high is a wall that casts a 15ft shadow at the same time that a 4ft flag pole casts a 4ft shadow?
November 23, 2012

college english
what is a good attention getter sentence on carpal tunnel syndrome?
November 21, 2012

statistics
The reaction time of subjects to a certain psychological experiment is considered to be normally distributed with a mean of 20 seconds and a standard deviation of 4 seconds. What is the reaction time such that only 10% of subjects are faster?
November 21, 2012

statistics
The reaction time of subjects to a certain psychological experiment is considered to be normally distributed with a mean of 20 seconds and a standard deviation of 4 seconds. What is the reaction time such that only 10% of subjects are faster?
November 21, 2012

statistics
Entry to a certain University is determined by a national test. The scores on this test are normally distributed with a mean of 500 and a standard deviation of 100. Tom wants to be admitted to this university and he knows that he must score better than 70% of the students who ...
November 20, 2012

Physics
A roller coaster is initially at a height of 40 m above the ground and has an initial velocity of 15 m/s. Using conservation of energy, find the velocity of the roller coaster at a height of 5 m above the ground.
November 19, 2012

Chemistry
What mass of Uranium (in mg) is contained in 1ml of 4.55M (UO2)3(PO4)3 solution? How do I solve this? *all numbers are subscripts
November 18, 2012

physics what am i doing wrong?
I figured it out......i dont understand why no one has helped me yet in the past week
November 16, 2012

physics what am i doing wrong?
Three masses are arranged in the (x, y) plane. 3kg (0,0) 7kg (10,0) 6kg (0,3) What is the magnitude of the resulting force on the 3 kg mass at the origin? The value of the universal gravitational constant is 6.6726 × 10^−11 N · m^2/kg^2. Answer in units of N...
November 16, 2012

can someone please help w/ physics?
anybody? please?
November 16, 2012

can someone please help w/ physics?
An object of mass 154 kg moves in a smooth straight tunnel of length 2990 km dug through a chord of a planet of mass 3.19 × 10^24 kg and radius 1 × 10^7 m Find the effective force constant of the harmonic motion. The value of the universal gravitational ...
November 16, 2012

english
Ms. Sue can you please check for #1 The Gerund Phrase is water skiing , sailing, and swimming Direct Object ?
November 16, 2012

PHYSICS!
An object of mass 154 kg moves in a smooth straight tunnel of length 2990 km dug through a chord of a planet of mass 3.19 × 10^24 kg and radius 1 × 10^7 m Find the effective force constant of the harmonic motion. The value of the universal gravitational ...
November 16, 2012

chemistry
. What is the mass concentration (titer) is a solution of sulfuric acid with the molar concentration equivalent 0.5 mol/dm3?
November 15, 2012

chemistry
Potassium nitrate weighing 15 g was dissolved in water volume of 200 cm3. Calculate the mass fraction of KNO3 in solution.
November 15, 2012

chemistry
What is the mass of dry NaCl sample should be taken for 100 cm3 of 0.5 mol/dm3 aqueous solution?
November 15, 2012

chemistry
Determine the molality 0.8 mol/dm3 solution of Fe2 (SO) 4. Density equal to 1 g/cm3.
November 15, 2012

chemstry
What mass of sucrose must be taken for solution weight of 200 g, which is equal to molality 0.05 mol / kg?
November 15, 2012

chemistry
What mass of sucrose must be taken for solution weight of 200 g, which is equal to molality 0.05 mol / kg?
November 15, 2012

social studies
which of the following statements is supported by the information in the map please help
November 14, 2012

physics
A 11.1-kg block rests on a horizontal table and is attached to one end of a massless, horizontal spring. By pulling horizontally on the other end of the spring, someone causes the block to accelerate uniformly and reach a speed of 3.12 m/s in 1.17 s. In the process, the spring...
November 13, 2012

physics
When an object of mass m1 is hung on a vertical spring and set into vertical simple harmonic motion, it oscillates at a frequency of 14.2 Hz. When another object of mass m2 is hung on the spring along with the first object, the frequency of the motion is 3.40 Hz. Find the ...
November 13, 2012

physics
A block rests on a frictionless horizontal surface and is attached to a spring. When set into simple harmonic motion, the block oscillates back and forth with an angular frequency of 9.0 rad/s. The drawing shows the position of the block when the spring is unstrained. This ...
November 13, 2012

physics
A 82.5-kg climber is scaling the vertical wall of a mountain. His safety rope is made of a material that, when stretched, behaves like a spring with a spring constant of 1.82 x 103 N/m. He accidentally slips and falls freely for 0.739 m before the rope runs out of slack. How ...
November 13, 2012

Physics
In New Hampshire the average horizontal component of Earth's magnetic field in 1912 was 16 uT, and the average inclination or "dip" was 73 degrees. What was the corresponding mag-nitude of Earth's magnetic field?
November 12, 2012

business calculus
X=D(p)=400-p
November 12, 2012

business calculus
X=D(p)=400-p
November 12, 2012

Math
Draw two scalene triangles that are not congruent, but have exactly five sets of parts (sides and angles) that are congruent. Make a drawing that is to scale. Label yourmeasurements.
November 8, 2012

Chemistry
what mass of nitrogen dioxide (8NO2) will form by reaction of 3.50 mole of perchloric acid (13HClO4) with excess methylamine (8CH3NH2)? Answer is 99.1 g. How do you work this?
November 6, 2012

Chemistry
*answer is 4.14g
November 6, 2012

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