Sunday

April 20, 2014

April 20, 2014

Total # Posts: 2,359

**calculus**

A mass on a spring vibrates horizontally on a smooth level surface. Its equation of motion is x(t)=8sint, where t is in seconds and x in centimeter. a. Find the velocity and acceleration at time t b. Find the position, velocity, and acceleration of the mass at time t=2pi/3. In...

**calculus**

Find the points on the curve y=(cosx)/(2+sinx) at which the tangent is horizontal.

**Physics**

Show that there is no Brewster’s angle for s polarization.

**Physics**

After the Sun exhausts its nuclear fuel, its ultimate fate may be to collapse into a white dwarf state. In this state, it would have approximately the same mass as it has now, but its radius would be equal to the radius of earth. (a) Calculate the average density of the white ...

**physics**

A hot air balloon is going up ward at a constant speed of 3.5 m/s. When it is 78 m above the ground, a package is released from the balloon. After it is released, for how long is the package in the air? The acceleration of gravity is 9.8 m/s2 . Answer in units of s

**math**

solve for b ab+3c=2x, I got b=2x-3c/a

**chem**

If the initial pressure of HD(g) is 2.270 atm, calculate the % decomposition of HD(g) when the reaction comes to equilibrium according to the balanced equation. The value of Kp at 727.0 °C is 0.26. The initial pressure of the reaction products is 0 atm. 2HD(g) = H2(g)+D2(g)

**physics**

A rocket-powered hockey puck has a thrust of 2.20 and a total mass of 0.700 . It is released from rest on a frictionless table, 2.90 from the edge of a 2.80 drop. The front of the rocket is pointed directly toward the edge.

**chemistry**

The initial concentration for the compounds involved in the reaction displayed were determined to be [CH4(g)] = 0.9530 mol/L, [H2O(g)] = 0.9911 mol/L, [CO(g)] = 0.7474 mol/L, [H2(g)] = 0.2717 mol/L. Calculate the value of the equilibrium constant (Kc) at 1200 K if the equilibr...

**chemistry**

Calculate the molarity (M) of Na+ in a solution prepared by adding 1.00 L of 0.800 M NaHC2O4 and 250 mL of 0.300 M NaHC2O4 . Assume volumes are additive. the answer is 0.700 but im not sure how to go about solving it please help thanks

**U.S. History**

Thanks

**U.S. History**

What is the Sullivan Act?? and was it of 1911 or 1924??

**Math**

3 ^ (y+7) = 8 find y..i know you have to change 3 & 8 to the same thing so you can cancel them out and bring the exponents down but i don't know what you have to multiply it by.

**Chemistry**

The speed of light is = 3x10^8 m/s. How long w ill it take to reach Pluto, 278,000,000,000 km away? This is how I solved it: 3x10^8m/s x 1km/1000m x 1/2.78x10^11 km I keep getting the wrong answer. I am not sure if this is how you set this conversion??

**Chemistry**

So how would i get 100.625 nm/Msec?

**Chemistry**

A dragster moves at a speed of 225 miles per hour. Express this speed in nanometers per Microsecond. Ok so I've solved this problem like twenty times, each time adding something into the equation or taking something out and I almost got the correct answer, but I was three ...

**Chemistry**

Thank You So Much

**Chemistry**

length in cm of one side of perfect cube of gold with a density of 18g/cc and mass of 25g? How would i set up this equation? I don't know what length formula I would use, because I know that i am not supposed to just divide the density by the mass, because that would be in...

**Chemistry**

so would it be 3x10^8mi/1sec x 1000km/1m x 60sec/1 min x 60min/1hr x and then what??

**Chemistry**

The speed of light is = 3x10^8 m/sec. How long will it take to reach Pluto, 278,000,000,000 km away? I don't understand how to set this problem?

**Chemistry**

I am unsure if it starts like 3x10^8m/1sec

**Chemistry**

The speed of light is = 3x10^8 m/sec. How long will it take to reach Pluto, 278,000,000,000 km away? I don't understand how to set this problem?

**geometry**

<DOE contains points D(2,3) O(0,0) and E(5,1). Find the coordinates of a point F so that OF is a side of an angle that is adjacent and supplementary to <DOE

**geometry**

<DOE contains points D(2,3) O(0,0) and E(5,1). Find the coordinates of a point F so that OF is a side of an angle that is adjacent and supplementary to <DOE

**Calculus**

Use interval notation to indicate where f(x) is continuous. f(x)= 7x^8-5x^4+4

**Science **

If an object has a volume of 22 liters and a mass of 35 kilograms what's the objects density?

**Science **

If an object has a volume of 22 liters and a mass of 35 kilograms what's the objects density?

**Science **

If an object has a volume of 22 liters and a mass of 35 kilograms what's the objects density?

**Business Math**

Joyce took out a loan for $21,900 at 12 percent on March 18, 2007, which will be due on January 9, 2008. Using ordinary interest, Joyce will pay back on Jan. 9 a total amount:

**math**

the diagram shows a trapeze in a childrens playground. AC is horizontal bar 1.2m long. BX and DY are vertial posts each 3.4m tall. they are 2.5m apart. AC is suspended by ropes, AB and CD each 2.0m long. Calculate to one decimal place the vertical height of AC above the ground

**physics**

a car slows from 22m/s to 3m/s at a constant rate if 2.1m/s. how many seconds are required before the car is traveling at 3m/s

**algebra**

Mike drove 80 miles per hour. How long will it take Mona to drive 100 miles.

**spanish**

ustedes Nosotros

**math**

trying to find out the 7 numbers to a data set with The minimum 17 The range is 45 The median is 32 The mode is 41

**math**

trying to find out the 7 numbers to a data set with The minimum 17 The range is 45 The median is 32 The mode is 41

**chem**

0.015

**physics**

A skateboarder, starting from rest, rolls down a 13.9-m ramp. When she arrives at the bottom of the ramp her speed is 6.06 m/s. (a) Determine the magnitude of her acceleration, assumed to be constant. (b) If the ramp is inclined at 33.2 ° with respect to the ground, what i...

**algebra**

10 = X/4 -8 X OVER FOUR IS A FRACTION

**algebra**

4b + 6 = -2

**math riddles for 7th grade**

trying to find a porking place

**MATH**

25 METERS IS EQUAL TO HOW MANY GIGAMETERS

**math**

Woops. I accidentally wrote .09 instead of .907 However, the actual answer is just the result of the distance divided by the rate (aka whatever 39/43 is).

**math**

Distance = rate * time 39 miles is the "Distance" from Franklin to his home, and 43 m/hr is his "rate" of travel. You are trying to figure out the "time" it takes for him to get home traveling at this "Distance" and "rate". Swi...

**Social Studies**

nothing helps me

**physics**

A skateboarder shoots off a ramp with a velocity of 6.8 m/s, directed at an angle of 56° above the horizontal. The end of the ramp is 1.5 m above the ground. Let the x axis be parallel to the ground, the +y direction be vertically upward, and take as the origin the point o...

**math 5th grade**

120

**parts of speech**

10 Finally, be strong in the Lord and in his mighty power. 11 Put on the full armor of God, so that you can take your stand against the devil’s schemes. 12 For our struggle is not against flesh and blood, but against the rulers, against the authorities, against the powers...

**calculus**

Find the points of intersection of the curves y=2sin(x-3) and y=-4x^2 + 2

**physics**

An observer, whose eyes are 1.97 m above the ground, is standing 47.0 m away from a tree. The ground is level, and the tree is growing perpendicular to it. The observer's line of sight with the treetop makes an angle of 25.0° above the horizontal. How tall is the tree?

**8th grade math**

List the integers that can replace n to make the statement -|8| < n < or = to - |-5| true.

**science**

wish someone would answer my other question?????

**science**

give an example from everyday life that shows that the atmosphere has substance.

**science**

dust is often light in color,while soot from fires is generally dark.what would happen to the amounts of solar radiation reflected and absorbed if a large amount of light-colored dust was added to the air?what if a large amount of dark soot was added?

**health**

i guess any threat, like a pandemic or somethng of that kind

**health**

is there any sites that i can go onto, if anyone knows any that i can look at thanks

**health**

What are some procedures used in public health to eliminate the threat to society?

**English**

just reposting this in neater form I had a question today in class it was "Please explain the main point that the character Bill has use evidence from the text to support that." In one of my sentences I placed "Bill said "Thats because some people feel wors...

**English**

Basically what im saying is i used direct text from the book as evidence to prove his point meaning the question was about the book specifically but i didnt put proper citing only references at the end

**English**

I had a question today in class it was "Please explain the main point that the character Bill has use evidence from the text to support that." In one of my sentences I placed "Bill said "Thats because some people feel worse when something bad might occur&qu...

**English**

Ok I had a question today in class regarding a book and there was a question to use evidence from the text to support it so I put "<char name> said "<insert direct txt from that book>" as an example to prove his main point now I included references a...

**basic statistics for the behavioral sciences**

see a.) if .15 = 15%, which is correct, then .5 is 50% not .005, therefore, 4 students failed but, we have calculated that 65% of the students have a grade above failing. The claim that 50% failed is false, there is only 35% left who have a grade other than the D and some othe...

**Trig**

If sin(x)= 4/5 then O=4, H=5 from SOH-CAH-TOA. Using pythagorean thm. yields A=3. cos(x)=A/H tan(x)=O/A csc(x)=H/O sec(x)=H/A cot(x)=A/O. In the 2nd quadrant sin,csc are positive, the other 4 are negative.

**Math**

98

**math**

hakozakzoa

**Stats **

A strong positive correlation of .95 indicates that the independent variable X is the cause for the variaton in Y. True/False- I say False but don't know for sure.

**Statistics **

While attending a sales meeting you were asked about the relationship between sales calls and actual sales made. Fortunately, you had just completed a study on this topic bu you failed to bring the report with you. However, you do recall that the coefficient of determination w...

**phi 103**

"The Senator wants to cut spending on police. I guess she doesn't care if we all get murdered" May commit which fallacy?

**Trig**

A car is traveling at a speed of 55 mph with a bearing of 210°. What vector represents the velocity?

**Math**

How much of 20% alcohol solution and 50% alcohol solution must be mixted to get 9 liters of 30% alcohol solution?

**Math**

Ice Dreams finds its profit from the sale of ice cream increases by $30 per week during the 9 weeks of student summer holidays. Find the profit for the summer season if the profit for the first week of the summer is $100.

**math**

a salesperson ears a salary of 17,000 per year. she also makes a commission of 14% on her saes. if her sales for the year total $120,000, how much money was she paid for the year?

**Physics**

A 0.02 kg-lead bullet traveling 200 m/s strikes an armor plate and comes to a stop. If all of it's energy is converted to heat that it absorbs, what is the temperature change?

**Algebra 1**

Thanks

**Algebra 1**

The term difference mathematically is for subtraction?

**Algebra 1**

What is the difference of 17 and 5 times a number?

**Physics**

where was this question?

**westernncilvilization II**

What do these readings tell you about Napoleon’s opinion of the Republic and the Enlightenment ideals which originally informed the course of the Revolution?

**Physics**

The displacement of a linear damped oscillator is given, for weak damping by x=Ke^(-bΩt) sin(βt+ ε) Show x has a maximum at times given by βt = 2nπ + d where n is an integer and d is gives the position of the first maximum Show also that the rat...

**Physics**

You should know this!

**Math - Write expression as single logarithm**

12logb^2vt

**chemistry**

About how much should the boiling point of pure water differ from .5m 1m and 1.5m aqueous solutions of NaCl and same molal solutions of CaCl2 Trying to check experimental data from van't hoff factor lab

**world history**

at the end of the eighteenth century, _____ who had the largest economy in the world. a. india b. britain c. spain d. china I'm almost sure its b. can someone tell me if im correct?

**world history**

in what regions did latin christendom expand during the period of the early mongol expansion?? britan and spain the middle east and spain prussia and north africa finland and estonia I answered middle east and spain am i correct

**history**

then it has to be maize farming

**history**

the economic security of the inca empire was based on intensive maize farming enviromental diversity extensive trade with the aztec empire ruthless massacres of enemy peoples my answer is enviromental diversity is that correct

**history**

no one knows how it happend, but the islamic world transformed most of the turkic invaders into its strength and shield. The newley converted turks conqured anatolia an Armenia from christians.

**history**

no one know how it happend, but the islamic world transformed most of the turkic invaders intom its strenght and shiled. The newley converted turks conqured anatolia an Armenia from christians.

**history**

ok then it must be (a) the way they word everything makes it confusing

**history**

12. Within the Islamic Empire, the Turkic people A. were completely integrated into the Arabic world. B. were mainly concerned with trade and commerce. C. acted as a powerful military shield. D. were educated people who administered the realm. c seems correct -- can someone ch...

**history**

In his famous sermon of 1095, Pope Urban II saw Christian Europe as A. only a small part of Europe and an even smaller part of the larger world. B. being evenly divided among Europe, Africa, and Asia. C. a military and economic powerhouse that had always been on the rise. D. c...

**HISTORY**

ACTUALLY ITS A AM I CORRECT

**HISTORY**

Which of the following is an example of new economic divisions in the European peasantry that began to occur during the fourteenth century? A. Peasants living east of the Elbe River became freer. B. Peasants living west of the Elbe River became freer. C. Peasants throughout E...

**world history**

Can someone please check my answers?? 1. A period of global cooling from the fourteenth to the nineteenth century is historically referred to as A. nominal cyclical cooling. B. the Little Ice Age. C. the Celsius effect. D. the Fahrenheit effect. 2. The economic security of th...

**history**

To find new territory for a growing population, the Song rulers A. purchased lands from neighboring peoples. B. colonized underpopulated areas to the southwest. C. sent people to unpopulated regions to the north. D. conquered territories by military force can someone check my ...

**world history**

which of the following practices did the ottomans use to strengthen their state?? missionaries were sent to remote areas to generate wealth the practice of religions other than islam was forbidden gifts where given to those who converted to islam christian children were enslav...

**history**

is establishment of a stsble ,coherent government across eurasia is this correct

**history**

what was the most important outcome of mongol peace spread of western ideas to the east spread of islam transfer of goods and technology from east to west or establishment of a stsble ,coherent government across eurasia

**world history**

How did the rulers of the Canyon peoples deal with the environmental challenges that their region presented? A. They allowed high levels of citizen participation in the running of their local communities. B. They developed a remarkable level of exchange with the Mississippian ...

**history**

What was the most effective remedy for plague? A. Snake venom B. Quarantine C. Abstaining from eating certain foods D. Armenian clay can someone help i found quarantine saved lives in the book. but im not sure if snake venom is the answer cause i cant find anything in there

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