Sunday
April 20, 2014

Posts by Anonymous


Total # Posts: 68,212

math
What percent of 600 is 84?

math
What percent of 25 is 23?

Chemistry
a.) How much energy is emitted in each alpha decay of plutonium-234 if 234Pu, 234.0433mu and 230U, 230.0338mu. b.) The half-life of plutonium-234 is 8.8 hrs. How much heat is released by the alpha decay of a 1 micro-gram sample of plutonium-234 in a 24-hour period? For part a,...

Chemistry
The main radioisotope in a banana is potassium-40, a beta emitter with an activity of 242 Bq/g. An average medium banana has about 320 mg of potassium and the natural abundance of potassium-40 is .0117%. Calculate the value of the BED in a.) Gy b.) Sv Assume 5.02 nGy/Bq

Math 117
nobody knows.

Business and Economics
The weights (in grams) of the contents of several small bottles are 8, 4, 3, 6, 7, 1 and 5. What is the sample variance? 5.81 4.33 5.67 2.22

Math
Try to make 24 using -,+,•,/ 1,5,4,3 & 3,12,4,1 & 10,9,7,2

Calculus
when t=90?

Calculus
A weight oscillates in a vertical motion according to the position function y(t)=-5 cos(t). Assuming t≥0, when will the acceleration if the weight be zero for the first time?

Calculus
An object in free fall has its distance from the ground measured by the function d(t)=-4.9t^2 +50, where d is in meters and t is in seconds. If gravity is the only acceleration affecting the object, what is gravity's constant value?

physics
For the purposes of this problem, there are three parts to the figure, and the center of mass of each one is shown in the drawing. These parts are: (1) the torso, neck, and head (total mass = 40.4 kg) with a center of mass located on the y axis at a point 0.403 m above the or...

physics
Two stars in a binary system orbit around their center of mass. The centers of the two stars are 7.78x1011 m apart. The larger of the two stars has a mass of 4.19x1030 kg, and its center is 1.75x1011 m from the system's center of mass. What is the mass of the smaller star?

health
The one area you can't control to reduce your chances of stroke, heart disease, or diabetes is

physics
A 6.26-g bullet is moving horizontally with a velocity of +344 m/s, where the sign + indicates that it is moving to the right (see part a of the drawing). The bullet is approaching two blocks resting on a horizontal frictionless surface. Air resistance is negligible. The bulle...

physics
The drawing shows a collision between two pucks on an air-hockey table. Puck A has a mass of 0.0430 kg and is moving along the x axis with a velocity of +5.41 m/s. It makes a collision with puck B, which has a mass of 0.0860 kg and is initially at rest. The collision is not he...

physics
For tests using a ballistocardiograph, a patient lies on a horizontal platform that is supported on jets of air Because of the air jets, the friction impeding the horizontal motion of the platform is negligible. Each time the heart beats, blood is pushed out of the heart in a ...

Social Studies
Use the biblical quotations below to answer the following question: 5 He set the earth on its foundations; it can never be moved.—Psalm 104:5 5 The sun rises and the sun sets, and hurries back to where it rises.—Ecclesiastes 1:5 Based on the Biblical quotations above...

Social Studies
what attitude would french revolutionaries take toward the men on the steps? A.the men should be respected B.the men should carry more of the burden C.the men are helpless and should be taken care of D.the men are divine and should be worshiped

Social Studies
How was France's Ancien Régime challenged by Enlightenment philosophies? The monarchy and nobility increased their status and prestige. King Louis XVI began challenging the power of the Catholic Church. ----> Lower- and middle-class citizens became more insistent...

Social Studies
government should express the will of the whole people?

Social Studies
The excerpt below is Article 6 of the "Declaration of the Rights of Man," the document that founded the French Republic on August 26, 1789. Use this excerpt below to answer the following question: Law is the expression of the general will. Every citizen has a right t...

World History
So is it C?

Physics
Object A has a mass of 443 kg. Object B has a mass of 356 kg. If they are separated by 3.4 m, what is the magnitude of the gravitational force between them?

Maths
A box contains pns and pencils in the ratio 6 : 5. There are 24 pens. How many pencils are there?

math
(Weighing produce). A supermarket has three employees who package and weigh produce. Employee A records the correct weight 98% of the time. Employees B and C record the correct weight 97% and 95% of the time, respectively. Employees A, B, and C handle 40%, 40% and 20% of the p...

Math
(Weighing produce). A supermarket has three employees who package and weigh produce. Employee A records the correct weight 98% of the time. Employees B and C record the correct weight 97% and 95% of the time, respectively. Employees A, B, and C handle 40%, 40% and 20% of the p...

Calculus
If y=cos x, what is y^(6) (x)?

statistics
A committee consists of five men and four women. Two people are selected at random from the committee. What is the probability that one man and one woman will be selected?

Algebra 2
Simplify the rational expression (x^2+xy-2y^2)/(x^2+3xy+2y^2)

English
Do I use an apostrophe after the A or not? "He got 5 As on the final exam." I've heard that capital letters are made plural only by adding an s, but my textbook gives this example-How many A's did you write on the paper?

personal finance
b

Algebra
But it has two variables?

Algebra
Simplify the rational expression (x^2+xy-2y^2)/(x^2+3xy+2y^2)

finance
23

finance
Polycorp has a current dividend of $5.00 due tomorrow and is expected to pay a dividend $5.50 at the end of the first year. Its dividend is expected to grow at 8% pa for the following year. Dividends are then expected to grow at 4% pa for another two years. Then they are expec...

history
Thanks Writeacher for your help

history
Good morning can you give me some facts about the effects of the world war 1 on New Jersey please help me

FINANCE
Now that they have accumulated a deposit of 55,000 Jack and Jill take out a housing loan to purchase a home. The house costs $755,000. It is to be repaid in equal monthly instalments over a term of 30 years. The interest rate quoted by the bank is an effective annual rate is 7...

FINANCE
A perpetuity with the first annual cash flow paid at the beginning of year 4 is equivalent to receiving $103,000 in 15 years’ time. Assume that the perpetuity and the lump sum are of equivalent risk and that j12 = 14.32% pa is the appropriate interest rate. How much is th...

FINANCE
Many creditors of your firm offer early payment discounts. The accounts payable supervisor does not believe in paying early “as the bank overdraft rate of j12 = 8% pa is more than the average 2% offered for payment within 10 days from date of invoice”. The supervisor...

FINANCE
Think .026

FINANCE
A ninety day bank bill with 90 days to maturity has a price of $99427.95. What is the effective annual yield implied by this price and maturity? Be careful I am not asking for the annual nominal yield, which by convention is normally quoted in financial markets. FACE VALUE OF ...

FINANCE
Polycorp has a current dividend of $5.00 due tomorrow and is expected to pay a dividend $5.50 at the end of the first year. Its dividend is expected to grow at 8% pa for the following year. Dividends are then expected to grow at 4% pa for another two years. Then they are expec...

FINANCE
Polycorp Treasury a company in the land of Zanadu is holding a parcel of Zanadu Government Bonds with a face value of $2,000,000. The bonds were issued seven years and nine months ago and still have two years and three months to maturity. They pay a coupon rate of interest of ...

FINANCE
Gamma Ltd is not expecting to pay dividends for three years, at the end of year four, a dividend of $2.45 is planned and dividends are expected to be constant forever after that. The required rate of return for Gamma Ltd equity is j4 = 12.25% pa. What is the expected price (cu...

FINANCE
Mooncorp Insurance has quoted you an annual premium to insure your car of $3100. You are offered a 15% discount if you pay the lump sum immediately. They also offer an alternative payment method. You can pay the account in full by making 12 equal beginning of the month payment...

Chemistry
a 4.000grams sample of aluminum metal is added to a solution containing 5.000grams of dissolved iron chloride. the reaction results in the formation of aluminum chloride and metallic iron. when the reaction is complete, unreacted aluminum remains, and this unreacted aluminum i...

physics
A baseball of mass m1 = 0.32 kg is thrown at a concrete block m2 = 6.25 kg. The block has a coefficient of static friction of μs = 0.71 between it and the floor. The ball is in contact with the block for t = 0.195 s while it collides elastically. What is the minimum veloc...

Calculus
Use a tangent line approximation at x=0 to estimate the value of sin(-0.1). I got 0.1

irsc
a 10-kg rock and a 20-kg rock are dropped at the same time and experience no significant air resistance. if the 10-kg rock falls with acceleration a, what is the acceleration of the 20-kg rock?

Chemistry
d

Math
Jayce wants to paint her room Duke Blue.Her room is 12 ft long ,12 ft 10inches wide, and 10ft high.If Dylan insists she paint her ceiling white, about how many cans of blue paint will she need to buy to paint the walls.One can covers 120 square feet. Ignore the windows and doo...

L.A
Read this sentence from New Directions.When we came from school, the wall was slick with white.Which meaning of the word slick is used in the sentence above? A.impressive and efficient<---- B.wet and slippery

Health
Dr.Margo Maine suggests that people exercise for the three F's which include.

Calculus
If position is given by p(t)=t^2 +1, find the velocity v(t) at t = 2. I'm completely lost as to where to even start with this problem.

science
Na2SO4(aq)+CaI2(aq)→CaSO4(s)+2NaI(aq) as net ionic

physics
A simple pendulum consists of a small object of mass 1.2 kg hanging at the end of a 2.07 m long light string that is connected to a pivot point. Calculate the magnitude of the torque (due to the force of gravity) about this pivot point when the string makes an angle of 6.59 de...

Finance
7 months

Finance
One of your customers is having trouble paying her account. You agree to a repayment schedule of $300 per month. You charge 1% per month interest on late accounts. If the current balance is $2000, how long will it take to pay off the debt?

Psychology
What make perception a cognitive rather than a simply sensory skill?

Physics
suppose that you drop the ball from a height of about 2m above the floor, releasing it from rest. on the axes that follow, sketch your predictions for the velocity-time and acceleration-time graphs of the ball's motion. assume that the positive y direction is upward

chemistry
what is the balanced chemical equation and how do you find the percent yield of iron in the experiment?

chemistry
in an experiment, a 4.000grams sample of aluminum metal is added to a solution containing 5.000grams of dissolved iron chloride. the reaction results in the formation of aluminum chloride and metallic iron. when the reaction is complete, unreacted aluminum remains, and this un...

math
John is looking at a map and it says that 1 inch = 50 miles. John wants to travel to a town that is 7.5 inches away on the map. How many miles must he travel to get there?

Chemistry
But I thought that the enthalpy of a reaction was dependant on the ratio of moles in the products vs moles in the reactants, not the limiting reagent..

Quick Math Question
Thanks Damon! My math skills are sadly not where they should be.

Quick Math Question
I was working out a problem and reached an answer of 3ln |x|+ (1/x)+ ln |x+1| The final given answer is (1/x) + ln |x^4 +x^3| I see that the (1/x) carried over and I know how the x^3 got there, but I'm confused as to the x^4. Can someone kindly explain this to me?

pre calculus
Find the exact values: tan(7pi/4) - tan (pi/6)

Science
PLEASE HELP !!!!! how are newtons second and third laws of motion important to your everyday life?

math
Sally made an initial deposit into an account bearing an interest rate of 7% compounded continuously. How long will it take for Sally's initial deposit to double in value?

math
P=347e^.023t, where t is the number of years after 1990. According to the model, in what year will the population reach 1000?

math
P=347e^.023t, where t is the number of years after 1990. Use the model to estimate the population in the year 2012.

math
Suppose 48,000 is invested at an interest rate of 4.2%, compounded quarterly. What will the account be in 10 years?

world history
how did Japan consolidate its hold over its people during the interwar period?

math
but how do they both equal zer

math
an open-topped box can be made from a rectangular sheet of aluminum, with dimensions 40 cm by 25 cm, by cutting equal-sized squares from the four corners and folding up the sides. Declare your variables and write a function to calculate the volume of a box that can be formed. ...

Phys
A typical lightning bolt has about 10.0 C of charge. How many excess electrons are in a typical lightning bolt?

Physics
When a rubber rod is rubber with wool, the rod becomes negatively charged. What can you conclude about the magnitude of the wool's charge after the rubber process? Why? Please Help!!

Physics
When a rubber rod is rubber with wool, the rod becomes negatively charged. What can you conclude about the magnitude of the wool's charge after the rubber process? Why? Please Help!!

Chemistry - Science (Dr. Bob222)
A student wanted to determine the amount of copper in a sample of copper ore. The student dissolved a 2.500 ± 0.001 g piece of copper ore in about 75 mL of nitric acid; then, a complexing agent was added. The student transferred this solution to a volumetric flask and u...

Chemistry - Science
Thank you!

Chemistry - Science
A 6.70 g sample of a binary mixture of silver (I) nitrate and sodium nitrate is completely dissolved in water to make a solution. Aqueous barium chloride is then added to this solution in excess to form 3.60 g of silver chloride solid. What is the percent by mass of silver nit...

physics 1
When jumping straight down, you can be seriously injured if you land stiff-legged. One way to avoid injury is to bend your knees upon landing to reduce the force of the impact. A 88.1-kg man just before contact with the ground has a speed of 3.53 m/s. (a) In a stiff-legged lan...

College Chemistry (DrBob222)
Thank you very much!!! Now it makes sense

College Chemistry (DrBob222)
A solution of an unknown weak acid, HA, is titrated with 0.100 M NaOH solution. The equivalence point is achieved when 36.12 mL of NaOH have been added. After the equivalence point is reached, 18.06 mL of 0.100 M HCl are added to the solution and the pH at that point is found ...

College Gen.Chemistry
A student wanted to determine the amount of copper in a sample of copper ore. The student dissolved a 2.500 ± 0.001 g piece of copper ore in about 75 mL of nitric acid; then, a complexing agent was added. The student transferred this solution to a volumetric flask and u...

Geometry
Find the midpoint of the segment with the given endpoints. M(–2, 1) and O(–3, 2)

Math
A 3-foot piece of wood is cut into two equal sections. How long is each section in inches? a. 9 inches b. 18 inches c. 27 inches d. 36 inches

College Chemistry (DrBob222)
You have 120.0 mL of a 0.245 M solution of NaCl in an open beaker. After several days, you test the solution and find that it now has a concentration of 0.348 M. How much water must have evaporated from the beaker given the new concentration?

College Gen. Chemistry - Science
Dear Dr Bob222, Thank you so much! The answer is 35.5 mL on H2O has evaporated.

College Gen. Chemistry - Science
You have 120.0 mL of a 0.245 M solution of NaCl in an open beaker. After several days, you test the solution and find that it now has a concentration of 0.348 M. How much water must have evaporated from the beaker given the new concentration?

physics
a spaceship is moving at 1000 m/s release a satellite of mass 1000 kg at a speed of 10 000 m/s. what is the mass of the spaceship if it slows down to a velocity of 910 m/s?

Ms. Sue?
Ms. Sue?

Literature/Social Studies (Ms. Sue!)
I have been trying to think but, no matter how many times I read Kennedy's speech, I struggle to answer this question.

Ms. Sue?
Ms. Sue?

Literature/Social Studies (Ms. Sue!)
Oh. Alright. I need to hurry, though.

Literature/Social Studies (Ms. Sue!)
Was #2 incorrect? Also, what might the answer be for number #4?

Literature/Social Studies (Ms. Sue!)
Thank you so much! Could you also evaluate my how-to essay? I would truly appreciate it if you could.

Literature/Social Studies (Ms. Sue!)
The New Frontier" by John F. Kennedy. 1. What ideas does Kennedy express by quoting William Brandford? A: By quoting William Bradford, Kennedy expresses the idea that, despite great difficulties, man can overcome anything through their will and determination. 2. What reas...

Please, I must hurry!
I need to leave soon.

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