Posts by Joey

Total # Posts: 544

Math
I don't understand it... n(n-r)(n-r-1)(n-r-2)..(3)(2)(1)/(n-r-1)(n-r-2)..(3)(2)(1)

Math
Can someone help me solve this question? I've read the book, notes, I still don't get it... Simply each of the following. a) n!/(n-1)! b) (n-r)!/(n-r-1)!

MATH
if cscè= -7/10 and cosè >0. a) draw a triangle in the correct quadrant with three sides properly labled. b) find the exact value of 7cotè- 4cosè. This means no decimals. find a common denominator and rationalize all denominators. simiplify ...

math
if csc= -7/10 and cos >0. a) draw a triangle in the correct quadrant with three sides properly labled. b) find the exact value of 7cot- 4cos. This means no decimals. find a common denominator and rationalize all denominators. simiplify completely

math
if csc= -7/10 and cos >0. a) draw a triangle in the correct quadrant with three sides properly labled. b) find the exact value of 7cot- 4cos. This means no decimals. find a common denominator and rationalize all denominators. simiplify completely.

math
if Amy stands 36 feet from a flagpole and the angle formed from the top of the flagpole to her feet is 38 degre, find the distance from her feet to the top of the flagpole. include correct units in your anwser and round to 2 decimal places...

Chemistry
I am doing a Catalase lab (Enzymes) I don't understand this question: What are the controls in the experiment?

math
8:30-15=8:15 8:15-35=7:40 7:40

math
1. 3 1/5 2. 3 3. 4 3/4 4. 4 4/5

science
if a force of 50 N stretches a spring 250 mm, what is the elastic potential energy of the spring when it is stretched by 200 mm?

science
if a force of 50 N stretches a spring 250 mm, what is the spring constant?

chemistry
A one thousand liter sample of water contains one gram of iron (III) ions. What is the concentration of Fe3+(aq) in parts per million?

Physics
At liftoff, a rocket has a mass of 2x10^6 kg. It expels hot gas which provides an upthrust of 3x10^7. Find the initial accelerating of the rocket.

English
im in grade 4. i want to know things like common mistakes , epelling errors everyone make and like homonyms

english
thank u. u know site for grammar?

english
use yellow flower in a sentence

Math
3 minutes 36 seconds. but i don't know why

physics
An automobile traveling at 50.0 km/h has tires of 100.0 cm diameter. (a) What is the angular speed of the tires about their axles? 1 rad/s (b) If the car is brought to a stop uniformly in 25.0 complete turns of the tires (without skidding), what is the magnitude of the angular...

physics'
A 100 kg hoop rolls along a horizontal floor so that the hoop's center of mass has a speed of 0.230 m/s. How much work must be done on the hoop to stop it?

physics
A uniform solid sphere rolls down an incline. (a) What must be the incline angle if the linear acceleration of the center of the sphere is to have a magnitude of 0.20g? 1° (b) If a frictionless block were to slide down the incline at that angle, would its acceleration ...

physics
A 1000 kg car has four 20 kg wheels. When the car is moving, what fraction of its total kinetic energy is due to rotation of the wheels about their axles? Assume that the wheels have the same rotational inertia as uniform disks of the same mass and size. 1 Why do you not need ...

physics
The figure below gives the speed v versus time t for a 0.510 kg object of radius 5.90 cm that rolls smoothly down a 30° ramp. What is the rotational inertia of the object? 1 kg·m2

physics
In the figure below, a solid cylinder of radius 12 cm and mass 11 kg starts from rest and rolls without slipping a distance L = 6.0 m down a roof that is inclined at angle è = 30°. (a) What is the angular speed of the cylinder about its center as it leaves the roof...

physics
In the figure below, a constant horizontal force Fapp of magnitude 17 N is applied to a wheel of mass 8 kg and radius 0.70 m. The wheel rolls smoothly on the horizontal surface, and the acceleration of its center of mass has magnitude 0.75 m/s2. (a) In unit-vector notation, ...

physics
A hollow sphere of radius 0.30 m, with rotational inertia I = 0.072 kg m2 about a line through its center of mass, rolls without slipping up a surface inclined at 25° to the horizontal. At a certain initial position, the sphere's total kinetic energy is 45 J. (a) How ...

physics
A yo-yo has a rotational inertia of 860 g·cm2 and a mass of 150 g. Its axle radius is 3.4 mm, and its string is 90 cm long. The yo-yo rolls from rest down to the end of the string. (a) What is the magnitude of its linear acceleration? 1 cm/s2 (b) How long does it take ...

physics
A plum is located at coordinates (-4.0 m, 0.0 m, 6.0 m). In unit-vector notation, what is the torque about the origin on the plum due to force F whose only component is indicated by each of the following equations? (a) Fx = 8.0 N ô = N · m (b) Fx = -5.0 N ô...

physics
A 1.8 kg particle-like object moves in a plane with velocity components vx = 20 m/s and vy = 50 m/s as it passes through the point with (x, y) coordinates of (3.0, -4.0) m. (a) What is its angular momentum relative to the origin at this moment? 1 kg · m2/s (b) What is ...

physics
At the instant the displacement of a 2.00 kg object relative to the origin is d = (2.00 m) + (4.00 m) - (3.00 m) , its velocity is v = - (5.50 m/s) + (2.90 m/s) + (3.20 m/s) , and it is subject to a force F = (5.70 N) - (7.80 N) + (3.80 N) . (a) Find the acceleration of the ...

literature
how to identify contradictions in literature

physics
A bullet of mass 8 g strikes a ballistic pendulum of mass 2.0 kg. The center of mass of the pendulum rises a vertical distance of 10 cm. Assuming that the bullet remains embedded in the pendulum, calculate the bullet's initial speed.

Physics
posted this question this morning but I'm not sure of the response Damon provided. I did it once but then I updated it later in this at the bottom- please check booth of my answers. If you were in a rotor style ride and the riders accelerate until the speed of ride is ...

Physics-Please check if I did this correctly
Please scroll down for the entire answer-I did it once in the first paragraph and than after Damon's response, I did it again-I think the 2nd one is correct, maybe- Thanks you

Physics-Please check if I did this correctly
I posted this question this morning but I'm not sure of the response Damon provided. I did it once but then I updated it later in this at the bottom- please check booth of my answers. If you were in a rotor style ride and the riders accelerate until the speed of ride is ...

Physics-I think I have it-Please check
Is this correct? I published something else earlier-that has to be wrong but I think this is correct. Force friction balances weight Force friction comes from force normal to create centripetal force mv^2/r = Force normal Force friction = mu x Force normal = mg mu x mv^2/r = ...

Physics-Please check
I posted this question this morning but I'm not sure of the response Damon provided. If you were in a rotor style ride and the riders accelerate until the speed of ride is reached- if the radius of the cylinder is 5.0m and the coefficient of friction between clothes and ...

Physics-Please help with formula
If you were in a rotor style ride and the riders accelerate until the speed of ride is reached- if the radius of the cylinder is 5.0m and the coefficient of friction between clothes and wall is 0.5, how do you find minimum speed you would need to stick to the wall of the ride...

Microeconomics
same question about the are monopolies evil?....i wanted to know if the regulators are evil?

Microeconomics
Are monopolies evil? who regulates most monopolies? Are those regulators evil?

geometry
in a rhombus PQRS PQ=y+8, QS=4y-7.Find PQ

math
i don't kno

anayltical chemistry
I have tried and tried to use the henderson-hasselbalch equation for this problem, but i do not understand how to plug in the data: how much ammonium sulfate should be added to 500mL of .3M ammonia to produce a buffer with a pH of 9.?

analytical chemistry
How much ammonium sulfate should be added to 500mL of .30M ammonia to make a buffer with a pH 9.0?

Math
Jen and Heather went to lunch. When the bill came, Jen discovered she had only $6. Luckily, Heather had enough money to pay the other part, or 3/5 of the bill. How much did Heather pay and how much was the total bill? Please explain how you got these answers.

calculus
A car braked at a constant deceleration of 45 ft / s2, producing a skid mark measuring 115 feet before coming to a stop. How fast was the car travelling when the brakes were first applied?

Physics!!
A 5000 kg helicopter accelerates upward at 2.25 m/s2. The acceleration of gravity is 9.8 m/s2 . What lift force is exerted by the air on the propellers? Answer in units of N.

Physics!!
A 4.9 kg bucket of water is raised from a well by a rope. The acceleration of gravity is 9.81 m/s2 . If the upward acceleration of the bucket is 3.3 m/s2, find the force exerted by the rope on the bucket of water. Answer in units of N.

Algebra
i need help solving this 3x y=4D

English
How do these develop theme of these allusions from Hamlet? 1. "I would have such a fellow whipped for o'erdoing Termagant" (II,ii,14) So basically Hamlet is telling his actors not over act during the play. 2. “For O, For O, the hobbyhorse is forgot”

7th grade social studies.
how does an economy become diversified? answer in terms of pre-indusrial, industrial and postindustrial.

English
Yes. Yes, I think so..when he tells her mother Gertrude not to sleep with Claudius, the king... However, I also believe that he only told his mother not to sleep with Claudius because he cares about her.... :|

English
Why did Shakespeare intent hamlet to have an oedipal complex? I am thinking because to make the character interesting? :S

English
Thank you! I can't seem to find any other ones...

English
Hi Can somebody tell me if this is correct? The question is, find lines that Shakespeare enjoy by commenting on the play itself. HAMLET (to FIRST PLAYER) 'Tis well. I’ll have thee speak out the rest soon. (to POLONIUS) Good my lord, will you see the players well ...

Physics-bobpursley please check
This is the question I posted about two hours ago and I worked it out two ways-could you scroll down and check it, please?If I have a roller coaster, and hill 1 height is 50cm and hill height 2 is 25 cm and the PE is .9 as it approaches the top of hill 2, how do I calculate ...

Physics-bobpursleyplease check
This is the question I posted about two hours ago and I worked it out two ways-could you scroll down and check it, please?If I have a roller coaster, and hill 1 height is 50cm and hill height 2 is 25 cm and the PE is .9 as it approaches the top of hill 2, how do I calculate ...

Physics-Please check
Should I have done this as 1/2mv^2 = mgh Cross out like terms and get to v^2 = square root of 2 x g x .25m(h)= 2.125 m/s Would this be correct?

Physics-Please check
. The way to calculate this is you take the KE would be .9. You would say .9 = ½ (.035 x v^2) = 2.215. Correct or no?

Physics-Please help
The coaster started at .18PE-the .9 is the PE at the top of the second hill.The second hill is lower.

Physics-Please help
If I have a roller coaster, and hill 1 height is 50cm and hill height 2 is 25 cm and the PE is .9 as it approaches the top of hill 2, how do I calculate the speed. Please help

Spanish
I have a question how to answer the following: 1. Estudias mucho? Would I say Si, me gusta estudio mucho. 2. Andas en patineta en el verano? Would I say Si, me gusta andas en patineta en el verano. I know I'm missing the upside down question mark in front of these ...

Chemistry
do YOU just dump your questions on here? my goodness...

Chemistry
Why don't you limit your self to asking 1-3 questions. We don't you your dam homework for you Missy.

chemistry
O OK

chemistry
Your body deals with excess nitrogen by excreting it in the form of urea, NH2CONH2. The reaction producing it is the combination of arginine (C6H14N4O2) with water to give urea and ornithine (C5H12N2O2). C6H14N4O2 + H2O  NH2CONH2 + C5H12N2O2 [Molar masses: 174.2 18.02 ...

Physics
Once a favorite playground sport, dodgeball is becoming increasingly popular among adults of all ages who want to stay in shape and who even form organized leagues. Gutball is a less popular variant of dodgeball in which players are allowed to bring their own (typically ...

Physics 1
SAINT SUCK AND HAVE NO FUTURE #WORSETHANTHEBROWNS

math
If you usually burn after 1/2 hour expose to sun, you can lenghten the time you are in the sun to three hours by applying SPF number 6. how long could a person who burns after 1/4 hour stay in the sun using SPF 15 lotion?

math
divide 15 by 2 and express your answer in three ways?

physics
Two balls are dropped, one from height H and the other from a height of 4H. How far apart should they be dropped (time wise) to hit the ground at the same time.

5
43x - 6 for an input of 4

physics
Two cars both start from rest and have the same constant acceleration. When radar is used to measure the velocity of each car, car A is found to be moving twice as fast as car B. At the instant the radar is used, car A has a displacement that is ______ times as great as the ...

chemisty
balance ___ch3ch2cooh + __o2 yields __co2 + ___h2o

chemistry
how many grams of NaOH must be added to 0.250 litres of water to form a solution of PH=10.0?

Math
Add. (5c^4-3c^3+4c^2+15c-6)+(c^5+9c^3+6c^2-4c+2)+(-8c^4+c^2-7c-8)

Math
Give exact and approximate solutions to three decimal places. (x-4)^2=20

Chemistry
Catalytic cracking is an industrial process used to convert high-molecular-mass hydrocarbons to low-molecular-mass hydrocarbons. A petroleum company has a huge supply of heating oil stored as straight chain C17H36, and demand has picked up for shorter chain hydrocarbons to be ...

math
7.5

math
cindy is making a punch for a party. the recipe calls for 3 bottles of cranberry juice in order to make enought punch to serve 40 guests. how many bottles of cranberry juice wil cindy need in order to make enough punch to serve 100 guest?

math
x = 16

Communication and Gender Studies
I can't imagine many women taking it as a compliment to be told, "You walk very manly" or "your face is so masculine." Face it. Women want to be feminine. Men want to be masculine. There's no shame in embracing your gender and wanting to be ...

Economics
A nations capital goods wear out over time, so a portion of it's capital goods become unusable every year. Last year, its residents decided to produce no capital goods, It has experienced no growth in its population or in the amounts of other productive resources during ...

math
express these ratios as a fraction in simplest form 1. 25 to10 2. 14:70 3. 11:66 4. 12 to 64 5. 90 to 33 6.50 : 100

math
what is a number less than 9.4 and greater than 9.3

ipc
f ngr

math
Find two of the three possible numbers that can be placed in the set below so that the median of all 5 numbers would equal their mean. {3, 6, 9, 10}

chemistry
it's in atm

math
what is the fraction between 4/9 and 5/9

math
what is the GCF and LCM of 36 and 84

math
The average (mean) of a and b is 10. The average of b and 10 is 1/2 of c. What is the average of a and c?

E=MC^2
Are there any schools offering British curriculum in USA?

Geometery
which describes the compositions of 3 reflections in three distinct line, two of which are paralell?

math
60% is what common fraction?

math
It takes 4 workers five days to clean 180 miles of highway. How many workers are needed to clean 250 miles of highway in just 6 days?

math
Mike took four tests: English, Math, Science and History. He scored a 74 in English and an 84 in History. The average of the four tests was 72. Math had a better score than Science by 6 points. What was his Science score?

math
what does x equal. x over 4, equals 7 over 10

math
what is the supplement of 120 degrees

math
The temperature was 16 degrees celsias at the beginning of the month. At the end of the month it was 3 degrees celsias. What is the difference between the two temperatures?

science
give 5 examples of componds snd its chemical formula

math
what is the compliment of 35 degrees

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