Saturday
December 20, 2014

Posts by Julie


Total # Posts: 961

physics
A beam of light is incident from air on the surface of a liquid. If the angle of incidence is 25.0° and the angle of refraction is 14.0°, find the critical angle for the liquid when surrounded by air. im not sure how to start this problem.
April 7, 2011

physics
A convex mirror has a focal length of 19.0 cm. Determine the object location for which the image will be one-fourth as tall as the object. i really need help on this one. im completely stuck!
April 6, 2011

physics
A convex mirror has a focal length of 19.0 cm. Determine the object location for which the image will be one-fourth as tall as the object. i know that 1/f=1/do=1/di. when i put the numbers into the equation i keep getting 23.75 and its saying that its wrong. can you please ...
April 6, 2011

social studies
What are the pros and cons of textbook social studies learning?
April 5, 2011

statistics
Start with x = 100 and add four x values to make a sample of five data such that: a. s = 0 b. 0 < s < 1 c. 5 < s < 10 d. 20 < s < 30
April 5, 2011

Calculus
Find the area of the region enclosed by the inner loop of the curve. r = 5 + 10sin(θ) Any help would be greatly appreciated!!!
April 4, 2011

Calculus II
Find the area of the region enclosed by the inner loop of the curve. r = 5 + 10sin(θ) Thanks for the help!
April 3, 2011

math
12x^4 _______ 42x
March 30, 2011

Algebra
Choose the correct simplification of (3xy6)2(y3)3.
March 20, 2011

physics
A small motor draws a current of 1.76 A from a 110 V line. The output power of the motor is 0.20 hp. (a) At a rate of $0.060/kWh, what is the cost, in cents, of operating the motor for 4.0 h? (b) What is the efficiency of the motor? for (a) i am doing IV*hours*price and its ...
March 14, 2011

math
Turn 7 21 into a percent and decimal. First simplify the fraction. Show your answer on the number line.
March 9, 2011

4th grade math
Aaron's family is driving 80 miles to the mountains. They have already traveled 30 miles. They are traveling at a speed of 50 miles per hour. How many hours will it take them to complete the trip?
March 7, 2011

calculas
how long will it take an ice cube to melt completely? You left out an ice cube ant 1/4 of it melts in 1 hour. Use the following steps to find out how long it will take before it is melted completely. 1-let s represent the side length of the ice cube, and observe that s is a ...
March 6, 2011

algebra
3 index square root 81 I got the answer 3 3index square root 3 is this correct?
February 28, 2011

Algebra
square root xyz cubed.
February 28, 2011

math
Solve for x: log3(x^2-4)-log3(x+2)=2
February 27, 2011

Math
A room is in the shape of a right triangle. The hypotenuse is 8 meters longer than the short leg and the long leg is 4 meters longer than the short leg. Find the length of each side. (ok, now how can it be done if I change each side to cm and km, then ft and yards?)
February 21, 2011

business statistics
The scores on a standardized exam are normally distributed with mean= 50 and variance=16. (a) what percentage of the scores exceed 58? (b) what percentage of the scores lie between 38 and 54? (c) what is the 84th percentile of the distribution?
February 20, 2011

algebra
(x+3)/(x^2-x-12) + (2/x + 3)= (1)/(x-4)
February 20, 2011

algebra
(x+3)/(x^2-x-12) + (2/x + 3)= (1)/(x-4)
February 20, 2011

algebra
(x+3)/(x^2-x-12) + (2/x + 3)= (1)/(x-4)
February 20, 2011

algebra
Factor the Following: 3x^2 + 10xy + 7y^2
February 20, 2011

algebra
This is how the problem looks: (x+3)/(x^2-x-12) + (2/x + 3)= (1)/(x-4)
February 19, 2011

algebra
x+3/x^-x-12 + 2/x+3 = 1/x-4
February 19, 2011

algebra
2/5 - 1/3 Top of complex fraction 2/3 - 3/4 Bottom of complex fraction
February 19, 2011

algebra
whoops x+6/27 = 1/x
February 19, 2011

algebra
x=6/27 = 1/x
February 19, 2011

Algebra
8x^3 + 1728
February 19, 2011

Algebra
-11^-3
February 19, 2011

Algebra
(4y^2)^5 __________ y ^-3
February 19, 2011

algebra
Find the equation of the line that passes through the points ( 8, - 15 )and(-2,5). write the equation in y=mx = b form.
February 19, 2011

algebra
Solve: x-2y= -5 2x+y= -5
February 19, 2011

Algebra
The resistance in an electric circuit varies inversely with the current. If the resistance is 12 ohms when the current is 4 amps, what is the resistance when the current is 8 amps.?
February 19, 2011

Algebra
3 is supposed to be the denominator of 2 6 is supposed to be the denominator of 5
February 19, 2011

Algebra
Complex Fractions _1_ - _2_ x^2 3 ____________ _1_ - _5_ x 6
February 19, 2011

Algebra
_x+6___ = _1_ 27 x is this where I cross multiply?
February 19, 2011

algebra
_2__ = ____2___ x-9 x^2-6x-27 Solve the equations Check solutions to the equations (plug the answer back into the original equation.)
February 19, 2011

Algebra
Help me factor this it's so easy I am not getting it figured out! 8x^2-16xy+8y^2
February 18, 2011

math
what is the difference between odds and probability?
February 15, 2011

Chemistry
I need to find out what the total acid concentration is in Kool-Aid. If 23.3 mL of 0.1043M NaOH neutralize a 60 mL solution of Kool-Aid (10 mL) and water (50 mL), what is the total concentration in a 10.00 mL aliquot of Kool-Aid? If you prepared a standard 250 mL serving by ...
February 15, 2011

Science
How might pollen be carried from the anther to the female part of the flower?
February 14, 2011

Chemistry AP
What is the mass of oxygen in a ml flask if the pressure is 1.00 atm and a temperature of 22.0 Celsius?
February 7, 2011

math
the needle of the scale in bulk food section of a supermarket is 25 cm long. find the distance when the needle rotates 50 degrees
February 6, 2011

physics
Two speakers are driven by a common oscillator at 870 Hz and face each other at a distance of 1.20 m. Locate the points along a line joining the two speakers where relative minima of pressure amplitude would be expected. (Use v = 343 m/s. Choose one speaker as the origin and ...
January 31, 2011

physics help please
Two speakers are driven by a common oscillator at 870 Hz and face each other at a distance of 1.20 m. Locate the points along a line joining the two speakers where relative minima of pressure amplitude would be expected. (Use v = 343 m/s. Choose one speaker as the origin and ...
January 31, 2011

algebra
Please help me write the polynomial by multiplying the factors together? (x+5)(x-4)^2
January 28, 2011

physics help pleased
Two trains on separate tracks move toward one another. Train 1 has a speed of 125 km/h and train 2 a speed of 100.0 km/h. Train 2 blows its horn, emitting a frequency of 500 Hz. What is the frequency heard by the engineer on train 1? (Assume the speed of sound is 345 m/s.)
January 28, 2011

physics
A commuter train passes a passenger platform at a constant speed of 40.0 m/s. The train horn is sounded at its characteristic frequency of 320 Hz. What overall change in frequency is detected by a person on the platform as the train moves from approaching to receding?
January 28, 2011

algebra
what is the percent of change from $48.50 to $38.80
January 26, 2011

Math
(5x + 10)(5x - 5)
January 17, 2011

Math
The area of a square field is represented by the trinomial x^2-10x+25. Write an expression that would represent the perimeter of the field.
January 17, 2011

Math
Find the area of a rectangle if its length is 5x+10 and its width is 5x-5
January 17, 2011

Math
(numeratorx^-4y^2/Denominator x^-2y^-4)-3
January 17, 2011

Math
lol omg I can't believe I missed that one!
January 17, 2011

Math
(abc)^0
January 17, 2011

Math
does the ^ mean squared? and there were No parentheses
January 17, 2011

Math
I had to simplify the expression: -5exponent2(squared) I got the answer of 25 wrong. Why is that wrong?
January 17, 2011

engineering
If a source is emitting particles at a rate of 15,000 particles per second, what is the flux at 30 cm away from the source?
January 13, 2011

half life
If the radiological half life of a material is 31 minutes, and you have 77 grams now, how much did you have 55 minutes ago?
January 13, 2011

physics
A 215 g mass is attached to a spring and executes simple harmonic motion with a period of 0.250 s. If the total energy of the system is 2.30 J. (a) Find the force constant of the spring. 135.81 N/m (b) Find the amplitude of the motion. i just need help with what equation i ...
January 12, 2011

physics
A 0.44 kg object connected to a light spring with a spring constant of 22.0 N/m oscillates on a frictionless horizontal surface. The spring is compressed 4.0 cm and released from rest. (a) Determine the maximum speed of the mass. 28.28 cm/s (b) Determine the speed of the mass ...
January 11, 2011

physics
figured it out
January 11, 2011

physics
A child's toy consists of a piece of plastic attached to a spring. The spring is compressed against the floor a distance of 2.00 cm, and the toy is released. If the toy has a mass of 105 g and rises to a maximum height of 75.0 cm, estimate the force constant of the spring.
January 11, 2011

physics
A frog in a hemispherical pod finds that he just floats without sinking in a fluid of density 1.30 g/cm3. If the pod has a radius of 3.00 cm and negligible mass, what is the mass of the frog?
January 7, 2011

algebra 1
a 100- foot cable is cut into two pieces.the first piece is 18 ft longer than the second. how long is each piece
January 6, 2011

pre algebra
$29/kg = how many cents/ g???? im really confused
January 5, 2011

physics help please...
A movable piston having a mass of 8.00 kg and a cross-sectional area of 5.00 cm2 traps 0.200 moles of an ideal gas in a vertical cylinder. If the piston slides without friction in the cylinder, how much work is done on the gas when its temperature is increased from 18°C to...
January 4, 2011

physics
A movable piston having a mass of 8.00 kg and a cross-sectional area of 5.00 cm2 traps 0.200 moles of an ideal gas in a vertical cylinder. If the piston slides without friction in the cylinder, how much work is done on the gas when its temperature is increased from 18°C to...
January 4, 2011

physics help please...
why is the difference in density 350? where does the 1000 come from?
December 20, 2010

physics help please...
A light spring of constant k = 170 N/m rests vertically on the bottom of a large beaker of water. A 5.70 kg block of wood (density = 650 kg/m3) is connected to the spring and the mass-spring system is allowed to come to static equilibrium. What is the elongation, ÄL, of ...
December 20, 2010

physics
A light spring of constant k = 170 N/m rests vertically on the bottom of a large beaker of water. A 5.70 kg block of wood (density = 650 kg/m3) is connected to the spring and the mass-spring system is allowed to come to static equilibrium. What is the elongation, ÄL, of ...
December 20, 2010

fundamentals of taxation
Determine the basis of stock in the hands of the shareholder in each of the following instances. Assume that the 80% rule is met in all cases. a. Contribution of property with a basis of $1,000 and a FMV of $1,400. b. Contribution of property with a basis of $3,000 and FMV of...
December 19, 2010

9th grade
what is the average power developed by a motor lifting 400kg at constant speed through 10m at 8 secs?
December 19, 2010

geometry
find the value of the variable and LN if M is between L and N. LM=8a, MN=11a, LM=24
December 14, 2010

5th grade math
ted wrote a three-digit number. He divided it by 14, added 12, and multiplited by 20. His final anser was 600. what number did ted write? Plese show me how t get the answer. thanks.
December 14, 2010

5th grade math
Shawn had 42 hits in 140 at bats during the baseballe season. What is the decimal that represents his batting average, or hits per at bat? Please show me how to get the answer... Thanks
December 14, 2010

5th grade math
Shawn had 42 hits in 140 at bats during the baseballe season. What is the decimal that represents his batting average, or hits per at bat?
December 14, 2010

Math
Karen s 60 inches tall. Her sister Kate is 48 inches tall. What fraction compares Kate's height to Karen's height?
December 14, 2010

Geometry
1. Explain whether the following statement is a valid definition: “A 150° angle is an obtuse angle.” Use the converse, biconditional, and at least one Euler diagram to support your answer. 2. Explain the purposes of inductive and deductive reasoning in ...
December 9, 2010

Modern World Studies
Yes, I've read my textbook many times. I just never found where it said what motivated Bismarck to enact reforms in Germany. This is the Second Industrial Revolution. I was hoping you could explain it.
December 9, 2010

Modern World Studies
1. As industry spread, the British and German governments initiated reforms to improve workers’ lives. What motivated Bismarck to enact reforms in Germany? What kinds of reforms were enacted in Germany and Britain? Please give me information that answers this question so ...
December 9, 2010

science
a shopper walks west 35m west, another 17m west and then 67m east. what is the resultant displacement?
December 8, 2010

science
a shopper walks west 35m west, another 17m west and then 67m east. what is the resultant displacement?
December 8, 2010

Chemistry
Thank you!
December 4, 2010

Chemistry
I am doing a report on ethylene glycol, AKA antifreeze, and I need to figure out if it is naturally occurring or if it is man-made. I can't seem to find this answer anywhere! Please help!
December 4, 2010

Physics-Please help
Thank you-I'll try it and get back with a possible answer maybe tomorrow
December 1, 2010

Physics-Please help
I have a question about the International Space Station-Its been orbiting earth at 350km-If the radius of the earth is 6,370 km, what is the period of orbit for the Space Station? Secondly, if it was moved to a geosynchronous orbit, what would the new altitude of the station ...
December 1, 2010

Physics
I have a question about the International Space Station-Its been orbiting earth at 350km-If the radius of the earth is 6,370 km, what is the period of orbit for the Space Station? Secondly, if it was moved to a geosynchronous orbit, what would the new altitude of the station ...
December 1, 2010

English
Thank you-I reposted a new post so please disregard it-thank you again
November 30, 2010

English-Please check?
After I posted the question I went back and reread the one part. Does he compare man and himself to ants and like pygmies we fight with cranes? Correct or not?
November 30, 2010

English
I'm reading Thoreau's "Where I lived and What I lived For-"Solitude and Conclusion." I don't understand how to answer this question. What does he compare man and his life to? Thank you
November 30, 2010

math
(5x5)+2-1 =
November 30, 2010

Algebra
why are they making things so complicated
November 26, 2010

math
what is the next number after 2,22,12,132,1342
November 21, 2010

Math
The hiking club hiked to a park at 4mph. They got a ride back to town in a truck that went 20mph. If the round trip took 18 hours, how far was it from town to the park?
November 21, 2010

Chemisty
Nitric acid is abailable commercially at a concentration of 16M. What volume would you use to prepare 750 ml of a 0.20 M solution?
November 17, 2010

english
is it it is true that she is more clever or cleverer
November 9, 2010

math
explain why estimating before you divide helps you place the first digit in the quotient
November 8, 2010

Math
The value of the digit in the thousandths place is equal to the sum of the measure of the angles in a triangle (180 degrees) divided by 30
November 5, 2010

english
subject matter
October 28, 2010

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