Thursday

January 19, 2017
Total # Posts: 2,412

**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?

*April 11, 2011*

**algebra**

write m minus 4 squared as a trinomial

*April 11, 2011*

**Chemistry**

How many valence electrons does Mo+3 have?

*April 8, 2011*

**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...

*April 8, 2011*

**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...

*April 7, 2011*

**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?

*April 7, 2011*

**chem**

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

*April 6, 2011*

**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 ...

*April 5, 2011*

**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?

*April 3, 2011*

**math**

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

*March 31, 2011*

**algerbra/astronomy**

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

*March 31, 2011*

**Algebra 1A**

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

*March 31, 2011*

**math**

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

*March 27, 2011*

**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

*March 27, 2011*

**math**

thanks, it helped a lot

*March 25, 2011*

**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?

*March 25, 2011*

**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?

*March 24, 2011*

**math**

Thanks

*March 24, 2011*

**math**

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

*March 24, 2011*

**Math**

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

*March 24, 2011*

**Math**

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

*March 24, 2011*

**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?

*March 21, 2011*

**algebral**

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

*March 19, 2011*

**astronomy**

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

*March 19, 2011*

**calculus**

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

*March 17, 2011*

**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).

*March 12, 2011*

**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).

*March 12, 2011*

**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)?

*March 11, 2011*

**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.

*March 8, 2011*

**Statistics**

Please help if you can.

*March 7, 2011*

**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?

*March 7, 2011*

**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?

*March 7, 2011*

**Statistics**

Nevermind, my friend is helping me out thanks!

*March 7, 2011*

**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 ...

*March 7, 2011*

**astrophysics**

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

*March 5, 2011*

**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?

*February 28, 2011*

**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 ...

*February 28, 2011*

**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?

*February 27, 2011*

**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 ...

*February 27, 2011*

**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 ...

*February 27, 2011*

**Physics**

THANKYOU

*February 27, 2011*

**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?

*February 27, 2011*

**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.

*February 27, 2011*

**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.

*February 27, 2011*

**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)

*February 27, 2011*

**Physics**

How did you guys find time?

*February 25, 2011*

**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...

*February 25, 2011*

**math**

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

*February 23, 2011*

**math**

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

*February 23, 2011*

**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

*February 18, 2011*

**Statistics**

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

*February 15, 2011*

**Statistics**

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

*February 15, 2011*

**MATH**

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

*February 13, 2011*

**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?

*February 13, 2011*

**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...

*February 10, 2011*

**algebra 2**

4xy4-4xz4

*February 10, 2011*

**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.

*February 10, 2011*

**computers**

T215?

*February 10, 2011*

**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?

*February 10, 2011*

**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?

*February 9, 2011*

**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.

*February 8, 2011*

**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 ...

*February 8, 2011*

**Chemistry**

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

*February 8, 2011*

**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!

*February 6, 2011*

**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...

*February 6, 2011*

**Physics**

591.85 J

*February 3, 2011*

**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...

*February 2, 2011*

**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...

*February 1, 2011*

**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

*January 31, 2011*

**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...

*January 30, 2011*

**English**

if u use the answer correctly and check them u will get 88.2 like i just got

*January 28, 2011*

**Math**

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

*January 28, 2011*

**College English**

B. They replaces aliens; them replaces abductees.

*January 26, 2011*

**chemistry**

3.051 g Cu and Zn -0.153 g Zn=2.898 g Cu After that: 2.898 g Cu/3.051 g Cu+Zn=0.94985 x 100%=94.99%

*January 26, 2011*

**chemistry**

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

*January 26, 2011*

**chemistry**

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

*January 26, 2011*

**chemistry**

how many moles are in 5 grams of no2 molecules?

*January 25, 2011*

**equations calculus**

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

*January 25, 2011*

**financial analysis**

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

*January 23, 2011*

**Spanish**

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

*January 21, 2011*

**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!

*January 20, 2011*

**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.

*January 18, 2011*

**Physics**

.5m from Paul*

*January 18, 2011*

**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?

*January 18, 2011*

**Psychology**

he has a weak ego

*January 15, 2011*

**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 ...

*January 15, 2011*

**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?

*January 13, 2011*

**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?

*January 13, 2011*

**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 ...

*January 13, 2011*

**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 ...

*January 13, 2011*

**Math**

c=500+ 40n

*January 12, 2011*

**Math**

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

*January 12, 2011*

**Math**

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

*January 11, 2011*

**Math**

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

*January 11, 2011*

**government**

3/5

*January 11, 2011*

**9th grade algebra**

solve -5/6=2/3(3c+4)

*January 11, 2011*

**9th grade algebra**

solve df + 10h=3 for h

*January 11, 2011*

**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 ...

*January 8, 2011*

**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

*January 5, 2011*

**math**

find the radius of each circle with the given measurement 20. C= 18pie in

*January 4, 2011*