Friday
October 31, 2014

Posts by bob


Total # Posts: 2,449

Physics
Show that there is no Brewster’s angle for s polarization.
October 5, 2011

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...
October 4, 2011

calculus
Find the points on the curve y=(cosx)/(2+sinx) at which the tangent is horizontal.
October 4, 2011

Physics
Show that there is no Brewster’s angle for s polarization.
October 4, 2011

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 ...
October 4, 2011

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
October 2, 2011

math
solve for b ab+3c=2x, I got b=2x-3c/a
October 2, 2011

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)
September 30, 2011

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.
September 30, 2011

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 ...
September 29, 2011

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
September 29, 2011

U.S. History
Thanks
September 26, 2011

U.S. History
What is the Sullivan Act?? and was it of 1911 or 1924??
September 26, 2011

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.
September 25, 2011

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??
September 25, 2011

Chemistry
So how would i get 100.625 nm/Msec?
September 25, 2011

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 ...
September 25, 2011

Chemistry
Thank You So Much
September 24, 2011

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 ...
September 24, 2011

Chemistry
so would it be 3x10^8mi/1sec x 1000km/1m x 60sec/1 min x 60min/1hr x and then what??
September 24, 2011

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?
September 24, 2011

Chemistry
I am unsure if it starts like 3x10^8m/1sec
September 24, 2011

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?
September 24, 2011

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
September 23, 2011

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
September 23, 2011

Calculus
Use interval notation to indicate where f(x) is continuous. f(x)= 7x^8-5x^4+4
September 22, 2011

Science
If an object has a volume of 22 liters and a mass of 35 kilograms what's the objects density?
September 22, 2011

Science
If an object has a volume of 22 liters and a mass of 35 kilograms what's the objects density?
September 22, 2011

Science
If an object has a volume of 22 liters and a mass of 35 kilograms what's the objects density?
September 22, 2011

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:
September 21, 2011

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
September 20, 2011

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
September 19, 2011

algebra
Mike drove 80 miles per hour. How long will it take Mona to drive 100 miles.
September 15, 2011

spanish
ustedes Nosotros
September 15, 2011

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
September 15, 2011

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
September 15, 2011

chem
0.015
September 14, 2011

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 ...
September 14, 2011

algebra
10 = X/4 -8 X OVER FOUR IS A FRACTION
September 13, 2011

algebra
4b + 6 = -2
September 13, 2011

math riddles for 7th grade
trying to find a porking place
September 13, 2011

MATH
25 METERS IS EQUAL TO HOW MANY GIGAMETERS
September 13, 2011

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).
September 13, 2011

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". ...
September 13, 2011

Social Studies
nothing helps me
September 11, 2011

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 ...
September 8, 2011

math 5th grade
120
September 5, 2011

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...
September 4, 2011

calculus
Find the points of intersection of the curves y=2sin(x-3) and y=-4x^2 + 2
September 3, 2011

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?
September 2, 2011

8th grade math
List the integers that can replace n to make the statement -|8| < n < or = to - |-5| true.
September 2, 2011

science
wish someone would answer my other question?????
August 31, 2011

science
give an example from everyday life that shows that the atmosphere has substance.
August 31, 2011

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?
August 31, 2011

health
i guess any threat, like a pandemic or somethng of that kind
August 31, 2011

health
is there any sites that i can go onto, if anyone knows any that i can look at thanks
August 31, 2011

health
What are some procedures used in public health to eliminate the threat to society?
August 31, 2011

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 ...
August 30, 2011

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
August 30, 2011

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&...
August 30, 2011

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 ...
August 30, 2011

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 ...
August 27, 2011

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.
August 23, 2011

Math
98
August 22, 2011

math
hakozakzoa
August 20, 2011

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.
August 8, 2011

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 ...
August 8, 2011

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?
July 31, 2011

Trig
A car is traveling at a speed of 55 mph with a bearing of 210°. What vector represents the velocity?
July 28, 2011

Math
How much of 20% alcohol solution and 50% alcohol solution must be mixted to get 9 liters of 30% alcohol solution?
July 27, 2011

Physics
hjfhjhf
July 11, 2011

managerial economics
why
July 11, 2011

Business math
22
July 9, 2011

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.
July 8, 2011

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?
July 6, 2011

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?
June 25, 2011

Algebra 1
Thanks
June 23, 2011

Algebra 1
The term difference mathematically is for subtraction?
June 23, 2011

Algebra 1
What is the difference of 17 and 5 times a number?
June 23, 2011

Physics
where was this question?
June 20, 2011

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?
June 17, 2011

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 ...
June 10, 2011

Physics
You should know this!
June 9, 2011

Math - Write expression as single logarithm
12logb^2vt
June 6, 2011

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
June 4, 2011

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?
June 2, 2011

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
June 1, 2011

history
then it has to be maize farming
May 31, 2011

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
May 31, 2011

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.
May 31, 2011

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.
May 31, 2011

history
ok then it must be (a) the way they word everything makes it confusing
May 31, 2011

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 ...
May 31, 2011

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. ...
May 31, 2011

HISTORY
ACTUALLY ITS A AM I CORRECT
May 31, 2011

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 ...
May 31, 2011

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 ...
May 29, 2011

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 ...
May 29, 2011

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 ...
May 29, 2011

history
is establishment of a stsble ,coherent government across eurasia is this correct
May 29, 2011

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