Saturday

December 20, 2014

December 20, 2014

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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