# Posts by Andrea

Total # Posts: 887

phy 231
A mass-spring system oscillates with an amplitude of 4.00 cm. If the spring constant is 277 N/m and the mass is 573 g, a.determine the mechanical energy of the system. b.Determine the maximum speed of the object. c.Determine the maximum acceleration.

phy 231
It takes 23 hours 56 minutes and 4 seconds for the earth to make one revolution (mean sidereal day). a.What is the angular speed of the earth? I got 7.292x10^-5 rad/s b.Assume the earth is spherical. Relative to someone on the rotation axis, what is the linear speed of an ...

civics
What was the purpose of the Little rock nine going to the high school?

phy 231
An object of mass m1=3.3 kg moving at 4.7 m/s strikes a stationary second object of unknown mass. After an elastic collision, the first object is observed moving at 3.76 m/s at an angle of -41° with respect to the original line of motion. What is the energy of the second ...

phy 231
A car of mass 860.0 kg accelerates away from an intersection on a horizontal road. When the car speed is 39.6 km/hr (11.0 m/s), the net power which the engine supplies is 5700.0 W (in addition to the extra power required to make up for air resistance and friction). Calculate ...

math
Justin has a total of 50 coins that are all nickels and quarters. He has 10 more nickels than quarters. How many of each coin does Justin have?

civics
what is the difference of the sixth and seventh amendment

What career part should i follow

Math
I have 6 thousands,12 tens, 9 hundreds, 10 ones and 3 tenths. What number am I? This is a question on my 3rd grade daughters math homework and I'm completely confused. I think it may be 7030.03???

PHY 231
Two masses M1 = 6.30 kg and M2 = 3.30 kg are on a frictionless surface, attached by a thin string. A force of 40.3 N pulls on M2 at an angle of 28.5° from the horizontal as shown in the figure. Calculate the tension T in the string.

PHY 231
Mass m1 = 11.3 kg is on a horizontal surface. Mass m2 = 5.70 kg hangs freely on a rope which is attached to the first mass. The coefficient of static friction between m1 and the horizontal surface is μs = 0.573, while the coefficient of kinetic friction is μk = 0.130...

Global History II
Wow. Thank you for the quick lesson. Appreciate it. Have a good night.

Global History II
Russia wanted the waterway? Russia had a stronger army than Turkey. Sorry, got this question for homework and I can't find the answer in my notes or text, and don't remember talking about it in class, been struggling so I turned here

Global History II
Oh - so Turkey controlled an important waterway? Then why was Russia threat to them?

Global History II
I have no idea. I've been stuck on this one question for two days. I think it's B but I can't find any info to confirm it

Global History II
Throughout history, Russia has been a threat to Turkey because Turkey a) ha large supplies of minerals b) shared Russia's religious beliefs c) controlled an important waterway d) was the leader of the Arab states

Chemistry
What is the total number of joules of hear needed to change 200g of ice to water at O degree Celcius?

algebra
From a point on a straight road, 2 cars are driven in opposite direction. One care at 69 miles per hour and the other at 27 miles per hour. How many hours will they be 480 miles apart?

science
why is it important for a cell to grow before it replicates its DNA?

Math
Socks are on sale 4 Pairs for \$5. How much would you pay for 8 Pairs of socks?

physic
In compressed state, a spring 3.00 meters long hanging from the ceiling has a potential energy of 2.0 joules. If the entire potential energy is used to release a ball of mass 1.2 kilograms vertically downward, then what is the kinetic energy of the ball when it reaches the ...

Solving Linear Equations (Math)
The length of a rectangle is 5m shorter than three times the width. The perimeter is 46m. Find the length of each side.

IPC
A motorcyclist changes the velocity of his bike from 20.0 meters/second to 35.0 meters/second under a constant acceleration of 4.00 meters/second2. How long does it take the bike to reach the final velocity?

General Winfield Scott

math - age problem
3 years ago, Vin’s age is 3 times the age of Paul. At the present, Vin’s age is twice the age of Paul. What would be their age 3 years from now if the sum of their present age is 18?

math
1.) 3 years ago, Vin’s age is 3 times the age of Paul. At the present, Vin’s age is twice the age of Paul. What would be their age 3 years from now if the sum of their present age is 18? 2.) Willie bought a jacket for 26.86 pesos. The jacket’s price had been ...

algeb
help please :) 1.) 3 years ago, Vin’s age is 3 times the age of Paul. At the present, Vin’s age is twice the age of Paul. What would be their age 3 years from now if the sum of their present age is 18? 2.) Willie bought a jacket for 26.86 pesos. The jacket’s ...

math
Insert parentheses to make the statement true; 6 x 5 - 2^2 = 45

History
It is A. Increase in tres in exploration.

math
Which rate of speed is higher. A car completing a 500-mi race in 3 1/3 hours or a car completing a 300-hours in about 2 1/2 hours

Geometry/Steve
the answer is actually b, (2,-1)

Life Science
determing whether expired air contains CO2. 1.Formulate hypothesis 2.Aim 3. a) idependent V, dependent and controlled variables 4. methods step by step 5. observation

Chemistry
How many moles of Ag2CrO4 will be produced from 6 moles of AgNO3?

HCCC
7/3+1/3y=3y-3

algebra
That's wrong. ^

Science
some countries

Geometry
Find the circumference of a circle with a radius of 6 in. A:6in B:12in C:6 pi in D: 12 pi in

Econ
Using the change in revenue formula for two products, ?R = [\$40,000(1 - 1.5) + \$90,000(-1.8)] (0.02) = -\$3,640. Thus, a 2 percent increase in the price of good X would cause revenues from both goods to change by \$3,640.

Geometry
In a 30,60,90 triangle 1: If b=12, find c 2: If b=3,find a Letter a is on the 90° side, b is on the bottom near 60° and c is near 30°. Could anyone explain how to do this? It's hard to understand from my textbook.

Language Arts
By the looks of it it looks like Yep. is correct =) Hope that makes everyone happy xD

Geometry
Cross multiplication 20+x = 6 ----- - x 5 Idk how to solve this with 2 x's

Geometry
Yes it's a 90, 45 45 triangle. And the letters go like this. A C B

Geometry
For questions 38-40 use the triangle. |\ 45° angles for the top of the | \ triangle and the bottom right | \C | \ 38: If a=12, find b | \ 39: If b=2,find c | \ 40: If c=12,find a -------- B. Is this pythagorean Therorem? When I try it that way it's not working out? ...

Geometry
Thank you!

Geometry
True or False? In an obtuse triangle all the angles are obtuse. I think it's false but I'm not sure.

Pre-Calculus
Explain the difference between sin^-1(x) and 1/sin(x), Are there different expressions for both these functions?

Geometry
A school's wrestling mat is a square with 50 ft sides. A circle 28 ft in diameter is painted on the mat. No wrestling is allowed outside the circle. Find the area of the part of the mat that is NOT used for wrestling. Use pie=22/7.

algebra
solve for x, y and z when 2x + 4y + 2z = 144 4x + y + 0.5z = 120 x + 3y + 4z = 144

math (algebra)
An entrepreneur has the following costs and revenue functions: TC = 30 + 3Q and TR = 4Q. Calculate the equilibrium quantity algebraically and graphically at the break-even point.

math
that is basically the statement don't understand it too.

math
it costs \$80 to produce any quantity of output and \$1.60 for any additional unit of output. write down the equation and graph the total cost function

Chemistry
CaCO3 ----------> CaO + CO2 When 45 grams of calcium carbonate decomposes, how many grams of calcium oxide are produced?

Chemistry
342g

Accountant Journal Entry Ledger
Cash is debited \$53,000 Building credited 45000 Land 8,000

cylinder word problem
Caitlin enjoys italian ices with her friends. The place scoops the ices into a cylindrical cup that has a radius of 3 cm and a height of 8 cm. each ice is topped off with a half scoop. Each scoop has a radius of 3 cm. What is the total amount of ice that is in Caitlin's ...

Part A: Divide (16x^5y^4 + 6x^3y - 2x^2y - 24x^2y^4) by -2x^2y. Part B: How would your answer in Part A be affected if the x2 variable in the denominator was just an x? Part C: What is the degree and classification of the polynomial you got in Part A? Is this first part right...

Acceleration
How did you do the work? I don't see it, not getting it.

Acceleration
I need help with the second part of this question. Please show work so I can see. Thanks. I. The fastest land mammal, the cheetah, can accelerate from 0 mi/hr to 70.0 mi/hr in 3.0 seconds. What is the acceleration of the cheetah? Give your answer in units of mph/sec. I got 23....

Economics
Clem Oatley could grow wheat and barley. He could grow 75 bushels of wheat or 125 bushels of barley using the same resources on an acre of his land. The price of wheat is \$2.00 per bushel and the price of barley \$ 0.80. Show the benefits to Clem from specialization. What ...

math work for workeys
Ok so I have an example and I used it for my work. First I'll show the example. Multiply a mixed number with a whole number. 4 times 2 and 1/8 . You multiply 4 times 2 and 4 times 1/8. Get 8 + 4/8. Simplified and got 8 and 1/2. The problem that I got was. You are a lead ...

math work for workeys
Ok so I have an example and I used it for my work. First I'll show the example. Multiply a mixed number with a whole number. 4 times 2 and 1/8 . You multiply 4 times 2 and 4 times 1/8. Get 8 + 4/8. Simplified and got 8 and 1/2. The problem that I got was. You are a lead ...

Pre-Calculus
find all the maximums of the polynomial f(x)=x^2-8x+11 What is the global (absolute) maximum?

Pre-Calculus
Describe the function resulting from reflecting f(x)=x^3+2x^2-x+5 about the x-axis and then the y-axis. Does the order of the reflections matter?

Language Arts
Yes it is 1.C 2.A 3.D 4.B 5.C I checked myself as a connections person (if you know what I mean):)

chemistry
isotope chromium -51 has a half life of 28 days. If the original sample had a mass of 28.0 grams, what mass of chromium -51 sample remains after 84 days?

Math
What is 8 and 2 over 20 minus 6 and 8 over 20 8 2 - 20 8=? 2=? 20=?

physics
a boom 4.7 meters,10000 kg, 20 degree angle, find torqe on the pivot i fond force=10000x9.81= 98100 N perpindiclar force = 33552 N torqe = 4.7x33552 = 167695 Nm i am told this is wrong

Pre-Calculus
I really need help on this question Simplify the expression by using a Double-Angle formula or a Half-Angle Formula cos^2 0/2-sin^2 0/2

math
A plane travels 1020 miles from New York City to Minneapolis in 3.3 hours. The return trip takes 2.75 hours. a. How many times faster is the return trip?

statistics
Suppose that in a large population the proportion of people that have a certain disease is 0.01. Use the Poisson approximation to find the probability that at least four people will have the disease in a group of 400 randomly selected people.

inequalities
Determine when the function f(x)=3x^3+4x^2-59x-13 is less than 7

Chemistry
How many liters of liquid nitrogen are produced when 360.0 L of nitrogen gas is liquified at 77.36 kl

Algebra
Perform the indicated operation or 6x/16+1/16

Math
Explain how to use hundredths grids to subtract 1.65-0.98

Pre-Calculus
Find a polynomial of degree 4 that has a integer coefficients and zeros 1,-1,2 and 1/2 (one half)?

What types of probkems can be solved by the greatest common factor? I think it is subtraxtion and division

Math
How many x-intercepts and how many local extrema does the polynomial P(x)= x(sqrt)3-4x have? How many x-intercepts and how many local extrema does the polynomial Q(x)=x^3-4x have? and If a>0, how many x-intercepts and how many local extrema does each of the polynomials P(x...

math
1hx

Biology
Plant -+ Deer --+ Tiger The first step in the energy chain that created the bonds of proteins in the tiger's muscle cells in the food chain shown above is the A. deer the tiger ate. B. plant the deer ate. C. photons the sun made. D. carbohydrates the plant made. I think it...

chemistry
Which one of these is NOT a mechanism of heat transfer Select one: a. Reflection b. Radiation c. Convection d. Conduction

chemistry
Which one of the following statements regarding ideal gas laws is FALSE? Select one: a. An ideal gas has an infinite heat capacity b. The macroscopic ideal gas equation is PV = nRT c. The temperature must always be measured in Kelvin (K) d. A single molecule of gas has kinetic...

English
Meredith- "I can't believe we graduated!" Sara- "Ugh high school why." Meredith- "Can you not." Sara- "Fine, I'm super excited and just can not wait!" Meredith- smirks "I know you're being sarcastic but lovely enthusiam...

English
What kind of dialogue should I write with this? Write an example of a very brief dialogue between at least 2 people who are talking about a recent event. The characters should be about your age(15).

english
I need help with some conversation examples! 1) Write an example of a conversation between at least 2 adults who are talking about the possibility of one of them getting a new promotion with their current company. 2) Write an example of a very brief dialogue between at least 2...

Chemistry
comparing and contrasting why is sodium hydrogen carbonate an effective antacid but sodium hydroxide is not?

Astronomy
3142

Math
Brian's boat has a top speed of 9 miles per hour in still water. While traveling on a river at top speed, he went 10 miles upstream in the same amount of time he went 20 miles downstream. Find the rate of the river current.

Calculus
At what interval is e^(-5x^2) concave up? I know the second derivative is 100x^2*e^-5x^2-10*e^-5x^2 but I just can not figure this one out. Thank you for your help!

2 3 7 9 10 answers

philosophy (john dewey)
The expected outcome or pattern of Developed Standards of "Rules of Conduct", "Moral Training" and "School Organizations" served to meet the national demands. What is the problem with this being upheld in our educational system?

math
Mr Tan has some amount of money. If he distributes equally to 2 persons, he left with \$1. If he distributes equally to 3 persons, he left with \$2. If he distributes equally to 4 persons, he left with \$3. If he distributes equally to 5 persons, he left with \$4. If he ...

statistics, math, college
if np >5 and nq>5 estimate P (fewer than 4) with n=13 p=0.4 by using normal distribution as an approximate to the binomial distribution if np <5 or nq< then state that the normal approximation is not suitable

statistics, math, college
assume that adults have I.Q scores that are normally distributed with a mean of 100 and a standard deviation 15. find p2 which is the IQ score seperating bottom 2% from the top 98%

statistics
The assets(in billions of dollars) of the four wealthiest people in a particular country are 43,25,21,15 assume that samples of size n=2 are randomly selected

geometry
v-2/81pir2h

chemistry
What will be the average density for a sample of metal with a mass of 12.6 g and volume calculations of 7.8 mL and 8.3 cm3 ? Omit units in the answer and report answer to one decimal place.

chemistry
What will be the average density for a sample of metal with a mass of 12.6 g and volume calculations of 7.8 mL and 8.3 cm3 ? Omit units in the answer and report answer to one decimal place.

Math
A 6 ft man stands by a 30 ft tower and casts a 10 ft shadow. How long is the shadow cast by the tower and what time is it?

Math
A 6 ft man stands by a 30 ft tower and casts a 10 ft shadow. How long is the shadow cast by the tower and what time is it?

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