Monday
April 21, 2014

Posts by james


Total # Posts: 1,800

Physics
Two waves with different periods are described mathematically by: y1 = (7.0 m)cos[ 2£kt/(3.0 ms)-£k/2 ] y2 = (2.0 m)cos[ 2£kt/(3.1 ms)-3£k/2] What is the beat frequency for these two waves?

chemistry
What are the quantum numbers for a 3d atomic orbital?

CHEMISTRY
I believe it is supposed to be m subscript l , I am not sure.

Discrete Math
Hi there I'm confused as to how to start this problem, any help at all would be great thanks! John Sununus was once the governor of New Hampshire, and his name reminds one of the authors of a palindrome (a words which is spelt the same way forwards as backwards, such as SU...

Discrete Math
Yeah same here and it's due tomorrow lol. So far I got this for #2 but I think it's wrong. A.) 1 x 26 x 25 x 24 = 15,600 B.) 26 x 25 x 24 x 23 = 14,398 C.) 25 x 24 x 23 = 13,800

Discrete Math
The only thing I can think of is starting with the method from the first problem and plugging in the numbers? How have you started it?

Discrete Math
I too am having trouble with that SUNUNUS problem, any idea how to approach it?

PHYSICS
Two waves with different periods are described mathematically by: y3 = (7.0 m)cos[ 2£kt/(3.0 ms) - £k/2 ] y4 = (2.0 m)cos[ 2£kt/(3.1 ms) ¡V 3£k/2] What is the beat frequency for these two waves?

algebra
write m minus 4 squared as a trinomial

Chemistry
How many valence electrons does Mo+3 have?

physics
A 0.210 kg plastic ball moves with a velocity of 0.30 m/s. It collides with a second plastic ball of mass 0.109 kg, which is moving along the same line at a speed of 0.10 m/s. After the collision, both balls continue moving in the same, original direction, and the speed of the...

physics
A 0.210 kg plastic ball moves with a velocity of 0.30 m/s. It collides with a second plastic ball of mass 0.109 kg, which is moving along the same line at a speed of 0.10 m/s. After the collision, both balls continue moving in the same, original direction, and the speed of the...

math
At the greenhouse where you work you need to make soil and vermiculite mixtures for potting plants. Flowering bushes need a mixture of 70% soil and 30% vermiculite by volume. About how many buckets of vermiculite should you add to 5 buckets of soil?

chem
determine the wavelength of the line in the emission spectrum produced by an electron transition He+ from ni= 4 to nf= 2.

English/Writing
I have to use all these words in one long sentence and the sentence has to make sense. Its on Essay Analysis...HELP>>> here are all the words analyse review comment coherent order clear balanced logical convincing for against pros cons breakdown overview detachment pl...

Chemistry
Suppose that you had a mercury-in-glass thermometer and calibrated to measure temperatures from -10 degrees C to 110 degrees C and you wished to measure a temperature of approximately 115 degrees C accurately. How might you use your thermometer to do it?

math
dont know how to solve this eqation but I have all the info. m= M + 5 log(d/10)=18+5 x log(5/10)=

algerbra/astronomy
m= M + 5 log(d/10)=18+5 x log(5/10)=

Algebra 1A
Solve for the missing piece of the equation and rewrite the equation. y = mx - 16 (17,8)

math
solve in factored form 3x^8 - 27x^7 + 21x^6

AP Chem
What is the net ionic equation when NaOBr is dissolved in water and the Ksp if the Ksp of the dissocataion of HOBr is 6.4 * 10^-6

math
thanks, it helped a lot

math
A hollow steel tube, 4 m long, has walls 5 mm thick and is open at each end. if the outer diameter is 41 cm, what's the inner diameter?

Rate problems and proportions
A deli sells 30 salads for every 48 sandwiches. At this rate, how many salads will they sell for every 64 sandwiches?

math
Thanks

math
convert the radical to rational exponent form. -7Radical(a+b)

Math
rationalize the denominator. Simplify. write final answers is standard form (a+bi). (4-5i)/(2-7i)

Math
convert the radical to rational exponent form. -7Radical(a+b)

Physics
A 1500 kg car is turning around an arc of radius 20 m at a constant speed of 30 mph without slipping. What is the friction force the ground exerts on the car?

algebral
What is the electromagnetic flux coming from the surface of a 5000K blackbody? I am supposed to use maxwells equation.

astronomy
What is the electromagnetic flux coming from the surface of a 5000K blackbody?

calculus
solve the initial value problem by separation of variables dy/dx=y^(2)+1, y(1)=0

algebra
Calculate the average speed of a water molecule (with a mass of 3.0e-26 kg) on the hot side of Mercury (710 Kelvin).

astronomy
Calculate the average speed of a water molecule (with a mass of 3.0e-26 kg) on the hot side of Mercury (710 Kelvin).

Chemistry
The following reaction has a standard enthalpy of reaction of -146.0 kJ/mol: Cu2O(s) + 1/2 O2(g) -> 2CuO(s) The standard enthalpy of formation of Cu2O(s) is -168.6 kJ/mol. What is the standard enthalpy of formation of CuO(s)?

Physics
A 32-kg girl is bouncing on a trampoline. During a certain interval after she leaves the surface of the trampoline, her kinetic energy decreases to 205 J from 435 J. How high does she rise during this interval? Neglect air resistance.

Statistics
Please help if you can.

Statistics
A family goes on vacation an average of three times every 8 years. a. What is the probability that they will have 4 vacations in an 8-year period? The answer the teacher gave us was .168 What formula would you use? Poisson, binomials, etc?

Statistics
Here's another tricky probability question. A soccer player scores an average of 3 goals per game: a) What is the probability that he or she will score 4 goals in a given game?

Statistics
Nevermind, my friend is helping me out thanks!

Statistics
A roster contains the names of 12 students from the School of Math, Science and Engineering (MSE) and 8 students from the Dreeben School of Education (DSE). Determine the probabilities of randomly selecting the following if the selection is done without replacement: A) An MSE ...

astrophysics
If the wavelength of Hydrogen is 21.10611405413 cm, what is the wavelength of oxygen in cm?

Geometry
You are boating and heading directly west. The speed of the boat in still water is 36 mi/h. The river flows directly north at 15 mi/h. What is your resultant speed and directional?

physics
PE = m x g x h PE = 2.48 x 9.8 x 28.1 PE = 682.94J at 28.1m KE at 28.1m = 0, because the object is still at rest. The kinetic energy at 0m transfers from the previously stated gravitational potential energy. KE = 682.94J at 0m Therefore PE = 0J at 0m Mechanical energy is the s...

Laws of Motion
A student stands on a scale in an elevator that is accelerating at 2.8m/s^2. If the student has a mass of 94 kg, to the nearest newton what is the scale reading?

Laws of Motion
Two skaters are in the exact center of a circular frozen pond. Skater 1 pushes skater 2 off with a force of 100 N for 1.4 seconds. If skater 1 has a mass of 30 kg and skater 2 has a mass of 74 kg, a) what is the relative velocity (v1 - v2) after the push to the nearest hundred...

Physics
Thank you drwls, there is another question that I am not getting really well right now. It is this: Two skaters are in the exact center of a circular frozen pond. Skater 1 pushes skater 2 off with a force of 100 N for 1.4 seconds. If skater 1 has a mass of 30 kg and skater 2 h...

Physics
THANKYOU

Physics
A 16-kg child sits on a 5-kg sled and slides down a 143-meter, 30-degree slope, to the nearest m/s what is his or her speed at the bottom?

Physics
Calculate the speed of an 7.8×104 kg airliner with a kinetic energy of 1.0 × 109 J. Answer in units of m/s.

Physics
In the 1950’s, an experimental train that had a mass of 41000 kg was powered across a level track by a jet engine that produced a thrust of 5.89 × 105 N for a distance of 520 m. Find the work done on the train. Answer in units of J.

Physics
A woman pushes a lawn mower with a con- stant force of 112 Newtons at an angle of 37degrees with respect to the horizontal. The lawn mower moves at a speed of 20 cm/sec. What is her power output? (1 hp = 746 Watts)

marketing
Imagine you are creating a marketing plan for a company that will sell kites. as you consider the marketing program what types of strategy should you consider including in the plan. Propose one specific example of each type of strategy that you are considering and present your...

math
How do angles in a quad add up to 540. when split into triangles

math
How do angles in a quad add up to 540. when split into triangles

grammar
Which is correct? 1. What did you do on the winter break? or 2. What did you do on winter break? I believe #2 is correect because the `the` is not needed. However, I cannot find a clear rule to support this. Please advise. James

Statistics
I figured it out. You do 14!(Factorial)/3!(14-3)!

Statistics
Heres the following question: Evaluate: (14 3) How would i do this problem? Note: The 14 is on top of the 3.

MATH
Find the center of the radius (x+2)^2 +y^2=64

business
what are some of the operations management that can help bring manufacturing back to the U.S? How can a focus on quality improve manufacturing?

physics
As soon as a traffic light turns green, a car speeds up from rest to 46.0 mi/h with constant acceleration 8.50 mi/h-s. In the adjoining bike lane, a cyclist speeds up from rest to 24.0 mi/h with constant acceleration 12.00 mi/h-s. Each vehicle maintains constant velocity after...

algebra 2
4xy4-4xz4

Chem
3 H2 (g) + N2 (g) --> 2 NH3 (g) How many liters of ammonia gas can be produced from 10.0 L of N2 and 20.0 L of H2? Assume all gases are measured at the same temperature and pressure.

computers
T215?

Chemistry
A solution contains 3.75g of nonvolatile pure hydrocarbon in 95g acetone. The boiling points of pure acetone and the solution are 55.95C and 56.50C, respectively. The molal boiling point constant of acetone is 1.71 C*kg/mol. What is the molar mass of the hydrocarbon?

AP Physics
A transverse wave is traveling with a speed of 500 m/s on a horizontal string. If the tension in the string is increased by a factor of 2, what is the speed of the wave?

Chemistry
3 H2 (g) + N2 (g) --> 2 NH3 (g) How many liters of ammonia gas can be produced from 10.0 L of N2 and 20.0 L of H2? Assume all gases are measured at the same temperature and pressure.

finance
A firm has beginning inventory of 300 units at a cost of $11 each. Production during the period was 650 units at $12 each. If sales were 700 units, what is the value of the ending inventory using LIFO? Note: LIFO, last-in, first-out represents that the last produced will be th...

Chemistry
from the equation: Ksp=(.08M)(F^-)^2 there are two unknown how do we solve it

Social Studies
Thanks, that is quite helpful do you have any additional information or links you could provide me with. I need to write like 3 pargraphs about this topic. Thanks Ms.Sue!

Social Studies
What factors may contribute to the differences in GDP per capita in the areas of the world in places like Europe which is high compared to Africa which is low? I know that the United States and Europe are more technologically advanced than Africa. I also know that economically...

Physics
591.85 J

Forensic Science
I have to order these steps that a CSI would do upon arrival of scence. 1. Look for identification on the body. 2. Notify the Medical Examiner to determine if head injury is sufficient to cause death. 3. Have the forensic laboratory analyze blood on trail and match it to blood...

Math
A major corporation is building a 4325 acre complex of homes, offices, stores, schools, and churches in the rural community of Glen Cove. As a result of this development, the planners have estimated that Glen Clove's population (in thousands) t yr from now will be given by...

Statistics
Calculate the first, second, and third quartiles of the following samples. 5 8 2 9 5 3 7 4 2 7 4 10 4 3 5 23

Physics
a block , mass .10 kg, slides from rest without friction down an inclined plane 2m long which makes an angle of 20 degrees with the horizontal.(a) WWhat force accelerates the block down the plane?(b)j What is the velocity of the block when it reaches the botton of the pplane? ...

Math
Domain of f o g F(x)=5/x+4 ; g(x)=1/x f(x)=x/x+5 ; g(x)=6/x

College English
B. They replaces aliens; them replaces abductees.

chemistry
What is the nuber of grams of oxygen present in 4.50 x 10^22 SO3 moleucles?

chemistry
What are the number of atoms of nitrogen in 10g of N2H4?

chemistry
how many moles are in 5 grams of no2 molecules?

equations calculus
what is the value of y in the equation (y/(2y-x))=0.5

financial analysis
an item which may be converted to cash within one year or one operating cycle of the firm is classified as a

Spanish
what is the correct pronoun: El hombre ____ (el libro) da al joven.

Math Please Help!!
Simplify. You may use the properties to help. When you type your answer, do not space between numbers and symbols. (-5a)(3b)(2c) Would this equal -30abc?? HELP!

physics
A bar 5m long has a weight of 50nt attached to the other end is 80nt. Determine the magnitude, direction, and point of application of the equilibriant.

Physics
.5m from Paul*

Physics
Paul and henry carry a sack weighing 600nt on a pole between them. If the pole is 2m long and the load is .dm from Paul, what forrce does each boy exert?

Microeconomics
Scarcity, utility and distribution are the underlying principles governing every economy. Human needs can never be satisfied (non-satiation principle) but the caveat is that when human attains more of the same things, they become happy (increasing utility: a measurement of sat...

optimization
A model space shuttle is propelled into the air and is described by the equation y= (-x2/2e) +ex (in 1000 ft), where y is its height in feet above the ground. What is the maximum height that the shuttle reaches?

physics
a car starts from rest and travels for 4.2 s with a uniform deceleration of 1.8m/s^2. what is the final velocity of the car?

statistics urgent
Consider all cars that are involved in an accident and assume that all cars are classified as either small or large. The probability that a small car is involved an accident is .2 if a small car is involved in an accident, the probabbility that there was fatality in that accid...

statistics
Suppose the number of customer complaints per day on the morning shift 6-12 noon at Doys is distributed as # of complaints f(x) 0 .3 1 ? 2 .2 what is the value of the missing probability? What is the average number of complaints per day on the morning shift at Doys? What is th...

Math
If ∆ ABC ~ ∆ DEF, BC = 12 cm, EF = 10 cm, and AC = 18 cm, find DF.

Math
Every Square is a rhombus. True or False? This one has me confused.

Math
In a rhombus all angles are right angles. True or False?

9th grade alegbra
solve -5/6=2/3(3c+4)

9th grade alegbra
solve df + 10h=3 for h

Physics
The parachute on a race car that weighs 8036 N opens at the end of a quarter-mile run when the car is traveling 39 m/s. The acceleration of gravity is 9.81 m/s2 . What net retarding force must be supplied by the parachute to stop the car in a distance of 1270 m? Answer in unit...

math
draw one set of letter from set 1 and place in set 2 draw one letter from set 2 place in set 3 now draw one letter from set 3 what is the probability that the last letter drawn is b? set 1 = bcb set 2 = bb set 3 = b

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