Tuesday

May 31, 2016
Total # Posts: 1,830

**physics**

The sound level in decibels is typically expressed as β = 10 log (I/I0), but since sound is a pressure wave, the sound level can be expressed in terms of a pressure difference. Intensity depends on the amplitude squared, so the expression is β = 20 log (P/P0), where ...
*November 17, 2011*

**Math**

subtract 15 from 17. it cancels o the left side. You're left with y/3.5=2 Now make it like a fraction y/3.5=2/1 Do the butterfly 3.5*2=7 7/1=7 7 is your answer i think.
*November 16, 2011*

**physics**

Using Newton's Law of Universal Gravitation, compare the weight of a 68.1 kg astronaut on the surface of the earth to the gravitational pull of the Earth on the same astronaut when she is on the International Space Station. Constants: Average altitude of the ISS above the ...
*November 16, 2011*

**physics**

Using Newton's Law of Universal Gravitation, compare the weight of a 68.1 kg astronaut on the surface of the earth to the gravitational pull of the Earth on the same astronaut when she is on the International Space Station. Constants: Average altitude of the ISS above the ...
*November 16, 2011*

**physics**

Using the weight equation, weight = (mass)(strength of gravity field) or Fg = mg, calculate your mass in kilograms. Constants: Strength of the gravity field near the surface of the earth, g = 9.8 m/s2. 4.448 Newtons equals one pound of force. You can find the other constants ...
*November 16, 2011*

**physics**

Using Newton's Law of Universal Gravitation, compare the effect of the Sun and the Moon on the tides. Constants: Mass of the Moon, M☽= 7.348E22 kg. Moon's semi-major axis, a☽= 3.844E8 m. You can find the other constants you will need on the Astronomy ...
*November 16, 2011*

**physics**

A college student is at a concert and really wants to hear the music, so she sits between two in-phase loudspeakers, which point toward each other and are 60.8 m apart. The speakers emit sound at a frequency of 428.75 Hz. At the midpoint between the speakers, there will be ...
*November 16, 2011*

**physics**

Using Newton's Law of Universal Gravitation, compare the gravitational pull of the Sun on the Earth to the gravitational pull of the Moon on the Earth. Constants: Mass of the Moon, M☽= 7.348E22 kg. Moon's semi-major axis, a☽= 3.844E8 m. You can find the ...
*November 16, 2011*

**physics**

A college student is at a concert and really wants to hear the music, so she sits between two in-phase loudspeakers, which point toward each other and are 60.8 m apart. The speakers emit sound at a frequency of 428.75 Hz. At the midpoint between the speakers, there will be ...
*November 16, 2011*

**physics**

The sound level in decibels is typically expressed as β = 10 log (I/I0), but since sound is a pressure wave, the sound level can be expressed in terms of a pressure difference. Intensity depends on the amplitude squared, so the expression is β = 20 log (P/P0), where ...
*November 16, 2011*

**physics**

You drop a stone down a well that is 12.37 m deep. How long is it before you hear the splash? The speed of sound in air is 343 m/s.
*November 15, 2011*

**physics**

A policeman with a very good ear and a good understanding of the Doppler effect stands on the shoulder of a freeway assisting a crew in a 40-mph work zone. He notices a car approaching that is honking its horn. As the car gets closer, the policeman hears the sound of the horn ...
*November 15, 2011*

**ASAP ENGLISH PAPER**

i am writing a paper for English the question is what ethical problems may rise in research on humans?List and describe the three principles researchers are supposed to be guided by in resolving dilemmas. I AM STUCK PLEASE HELP ME!!!!!!
*November 14, 2011*

**Calculus--Please Help!**

A 13-foot ladder is leaning against a vertical wall. If the bottom of the ladder is being pulled away at a rate of 2 feet per second, how fast is the area of the triangle formed by the wall, the ground, and the ladder changing when the bottom is 12 feet away from the wall?
*November 13, 2011*

**Question (answer quick) **

No problem =)
*November 13, 2011*

**Question (answer quick) **

I would most likely go with A.
*November 13, 2011*

**english**

The sentence "The exhibits show all different varieties of cheeses and breads..." I believe contains an error. In that sentence, since you have made the word "variety" plural, you should not have s's after cheese and and bread. In other words, it should...
*November 13, 2011*

**College Calculus**

A 13-foot ladder is leaning against a vertical wall. If the bottom of the ladder is being pulled away at a rate of 2 feet per second, how fast is the area of the triangle formed by the wall, the ground, and the ladder changing when the bottom is 12 feet away from the wall?
*November 13, 2011*

**Calculus**

find the derivative of: (x^2+y^2)^2=x^2-y^2
*November 13, 2011*

**Calculus**

find the derivative of: (x^2+y^2)^2=x^2-y^2
*November 13, 2011*

**English**

Oxymoron because it contains two contradictory words. a crime cannot be holy
*November 13, 2011*

**math2**

Dan had to complete the remaining 1/3 of his science project this week. On Monday, he completed 4/5 of the work he had left to do. What part of the entire project did Dan complete on Monday? Can you guide me on how to figure it out?
*November 10, 2011*

**math**

Dan had to complete the remaining 1/3 of his science project this week. On Monday, he completed 4/5 of the work he had left to do. What part of the entire project did Dan complete on Monday?
*November 10, 2011*

**Math**

Thank you Steve
*November 8, 2011*

**Math**

one angle of a triangle is 90 degrees. If the ratio of the legs i 1:1, what are the mesuares( in degrees) of the 2 remaining angles?
*November 8, 2011*

**chemistry**

consider C3H8+O2=CO2+H20 how much oxygen would be needed to completely burn 250g of propane
*November 6, 2011*

**Chemistry -buffers.**

**1 mole of CO2 at stp is 22.26L Pka=6.1 at 37C Solubility coefecient =0.031 mmol/LmmHg at 37 C
*November 6, 2011*

**Chemistry -buffers.**

The pH of an arterial blood sample is 7.15. upon acidification of 10 ml of the plasma 5.91ml of CO2 is produced at standard temperature and presure. Calculate-a) total CO2 in the specimen b)the individual concentration of disolved CO2(H2CO3) and HCO3- c)The partial pressure of...
*November 6, 2011*

**Chemistry**

If in an experimental reaction 32.5 mL were collected of hydrogen gas at 23.5 degrees celsius and 745.2 Torr what would be the volume corrected to STP conditions?
*November 3, 2011*

**global healh and nursing**

how and why do nurses use the epidemiology methods and data?
*November 2, 2011*

**calculus**

A rectangular beam is cut from a cylindrical log of radius 25 cm. The strength of a beam of width w and height h is proportional to wh2. (See Figure 4.70.) Find the width and height of the beam of maximum strength.
*November 1, 2011*

**nursing**

Why is epidemiology important in the study of health and disease in communities
*November 1, 2011*

**Math**

google "rule of 72"
*October 31, 2011*

**geometry**

Looking at formulas, which 2 shapes describe this relationship: the area of the 2 dimensional shape is one-fourth the surface area of the 3-demensional figure? Looking at formulas, which two figures describes this relationship: the volume of the first 3-dimensional figure is ...
*October 30, 2011*

**physics**

Find the minimum diameter of a 51.5-m-long nylon string that will stretch no more than 1.01 cm when a load of 68.9 kg is suspended from its lower end. Assume that Ynylon = 3.51·10^8 N/m2 physics - bobpursley, Saturday, October 29, 2011 at 10:32am Hookes Law: elongation...
*October 30, 2011*

**physics**

yes I know. I solved with the value of elongation 0.0101 m. and I've found diameter 0.11 ! But it's wrong :( I tried many times and i always found 0.11 diameter.. I don't know where is the problem..
*October 30, 2011*

**physics**

Find the minimum diameter of a 51.5-m-long nylon string that will stretch no more than 1.01 cm when a load of 68.9 kg is suspended from its lower end. Assume that Ynylon = 3.51·10^8 N/m2 physics - bobpursley, Saturday, October 29, 2011 at 10:32am Hookes Law: elongation...
*October 30, 2011*

**physics**

Find the minimum diameter of a 51.5-m-long nylon string that will stretch no more than 1.01 cm when a load of 68.9 kg is suspended from its lower end. Assume that Ynylon = 3.51·108 N/m2
*October 29, 2011*

**PSY Quiz**

Question 3 of 10 0.0/ 2.0 Points Which of the following is an effective approach for estimating heritability of a trait or behavior? D. Comparing twins to determine whether identical twins are more alike than are fraternal twins Question 9 of 10 0.0/ 2.0 Points A culture in ...
*October 27, 2011*

**7th grade Algebra**

4w-9(6-5w)=44;w=3 decide whether the given value is a solution of the equation if not find the solution
*October 26, 2011*

**nursing**

bioterrorism and how might you prepare for its effects?
*October 26, 2011*

**physics**

An open-topped tank completely filled with water has a release valve near its bottom. The valve is 1.63 m below the water surface. Water is released from the valve to power a turbine, which generates electricity. The area of the top of the tank, AT, is a = 12.3 times the cross...
*October 26, 2011*

**physics**

Donald Duck and his nephews manage to sink Uncle Scrooge's yacht (m = 4843 kg), which is made of steel (ρ = 7850 kg/m3). In typical comic-book fashion, they decide to raise the yacht (which is now on the bottom of a lake) by filling it with ping-pong balls. A ping-...
*October 26, 2011*

**physics**

thank you drwls !
*October 26, 2011*

**physics**

A hollow rubber ball with a diameter of 5.57 cm and a mass of 38.9 g is cut in half to make a boat (in a bathtub) for American pennies made after 1982. The mass and volume of an American penny made after 1982 are 2.5 g and 0.36 cm3. How many pennies can be placed in the boat ...
*October 26, 2011*

**nursing**

Because water is an essential requirement for sustaining life, why is local or international water assessment necessary to prevent disease?
*October 25, 2011*

**physics**

Find the minimum diameter of a 51.5-m-long nylon string that will stretch no more than 1.01 cm when a load of 68.9 kg is suspended from its lower end. Assume that Ynylon = 3.51·108 N/m2.
*October 25, 2011*

**physics**

A hollow rubber ball with a diameter of 5.57 cm and a mass of 38.9 g is cut in half to make a boat (in a bathtub) for American pennies made after 1982. The mass and volume of an American penny made after 1982 are 2.5 g and 0.36 cm3. How many pennies can be placed in the boat ...
*October 25, 2011*

**physics**

A sinusoidal wave on a string is described by the equation y = (0.169 m) sin (0.713 x - 41.9 t), where x and y are in meters and t is in seconds. If the linear mass density of the string is 10.1 g/m .. if needs values of these ( the speed of the wave is 58.77 m/s) (the ...
*October 25, 2011*

**Geometry**

The distance between two docks on opposite sides of a river is 90 meters. The angle formed by the river bank and the line between the docks is 53°. What is the width of the river? Round your answer to the nearest meter and show your work.
*October 25, 2011*

**Geometry**

The distance across a lake is 34 meters. What is the distance, h, between the boat ramp and the dock? Round your answer to the nearest meter and show your work.
*October 25, 2011*

**physics**

(d) Wave pwer is proportional to frequency and Amplitude^2. f=6.669 Hz u=10.1 g/m A=0.169 m W=41.9 I tried with the power transmitted formula power=0.5*u*W^2*A^2*v But my solution is wrong :( I can not find a) and d) :(
*October 25, 2011*

**physics**

a) ... the phase of the wave at x = 2.27 cm and t = 0.175 s. ? yes x is 2.27 cm. in meter is 0.0227m !
*October 25, 2011*

**physics**

A sinusoidal wave on a string is described by the equation y = (0.169 m) sin (0.713 x - 41.9 t), where x and y are in meters and t is in seconds. If the linear mass density of the string is 10.1 g/m ... a) ... the phase of the wave at x = 2.27 cm and t = 0.175 s. ? b)... the ...
*October 25, 2011*

**math**

if you start from the bottom, you get 16, then 27 then 38 27 is greater than 25 and less than 35
*October 24, 2011*

**algebra**

does 6^2 + 20^2 = 21^2 ?
*October 24, 2011*

**Alegra Beginning**

ok, (2 x Tom) + Tom = 48,000 + 6,000 3 Tom = 54,000 Tom = 54,000 / 3 Can you figure out the rest?
*October 24, 2011*

**Alegra Beginning**

Rachel = (2 x Tom) - 6,000 Rachel + Tom = 48,000 so, (2 x Tom) - 6,000 + Tom = 48,000 can you solve it from here?
*October 24, 2011*

**algebra **

4 shorts will cost $ 14 x 4 , how much is left from $ 92 after that? Then divide that by $ 12 to see how many shirts Susie can buy .
*October 24, 2011*

**algebra,math**

a^2 + b^2 = c^2
*October 24, 2011*

**MATH **

wouldn't she be 5 years older 5 years from now?
*October 24, 2011*

**MATH **

Mom = 5 x (Marta) Mom = 25 so 25 = 5 x (Marta)
*October 24, 2011*

**physics**

A sinusoidal wave on a string is described by the equation y = (0.169 m) sin (0.713 x - 41.9 t), where x and y are in meters and t is in seconds. If the linear mass density of the string is 10.1 g/m ... a) ... the phase of the wave at x = 2.27 cm and t = 0.175 s. ? b)... the ...
*October 24, 2011*

**physics please helpp **

A sinusoidal wave on a string is described by the equation y = (0.169 m) sin (0.713 x - 41.9 t), where x and y are in meters and t is in seconds. If the linear mass density of the string is 10.1 g/m ... a) ... the phase of the wave at x = 2.27 cm and t = 0.175 s. ? b)... the ...
*October 24, 2011*

**physics**

A sinusoidal wave on a string is described by the equation y = (0.169 m) sin (0.713 x - 41.9 t), where x and y are in meters and t is in seconds. If the linear mass density of the string is 10.1 g/m ... a) ... the phase of the wave at x = 2.27 cm and t = 0.175 s. ? b)... the ...
*October 24, 2011*

**physics**

A sinusoidal wave on a string is described by the equation y = (0.169 m) sin (0.713 x - 41.9 t), where x and y are in meters and t is in seconds. If the linear mass density of the string is 10.1 g/m ... a) ... the phase of the wave at x = 2.27 cm and t = 0.175 s. ? b)... the ...
*October 24, 2011*

**physics**

217.7 km i found it. thankss
*October 24, 2011*

**physics**

An earthquake generates three kinds of waves: surface waves (L waves), which are the slowest and weakest; shear (S) waves, which are transverse waves and carry most of the energy; and pressure (P) waves, which are longitudinal waves and travel the fastest. The speed of P waves...
*October 24, 2011*

**4th grade Social Studies **

What are the steps of the water cycle
*October 24, 2011*

**4 grade math**

complete the following problem 4+8+7/3*72
*October 24, 2011*

**physics**

A sinusoidal wave on a string is described by the equation y = (0.169 m) sin (0.713 x - 41.9 t), where x and y are in meters and t is in seconds. If the linear mass density of the string is 10.1 g/m ... a) ... the phase of the wave at x = 2.27 cm and t = 0.175 s. ? b)... the ...
*October 24, 2011*

**physics**

i found it ! thankssss
*October 24, 2011*

**physics**

bobpursley 369 km is true!! thnx very much ! But if starts barking is 23.3 s ?? what is answer ?? can you calculate please !
*October 24, 2011*

**physics**

An earthquake generates three kinds of waves: surface waves (L waves), which are the slowest and weakest; shear (S) waves, which are transverse waves and carry most of the energy; and pressure (P) waves, which are longitudinal waves and travel the fastest. The speed of P waves...
*October 24, 2011*

**physics**

An earthquake generates three kinds of waves: surface waves (L waves), which are the slowest and weakest; shear (S) waves, which are transverse waves and carry most of the energy; and pressure (P) waves, which are longitudinal waves and travel the fastest. The speed of P waves...
*October 24, 2011*

**physics**

An earthquake generates three kinds of waves: surface waves (L waves), which are the slowest and weakest; shear (S) waves, which are transverse waves and carry most of the energy; and pressure (P) waves, which are longitudinal waves and travel the fastest. The speed of P waves...
*October 24, 2011*

**physics**

An earthquake generates three kinds of waves: surface waves (L waves), which are the slowest and weakest; shear (S) waves, which are transverse waves and carry most of the energy; and pressure (P) waves, which are longitudinal waves and travel the fastest. The speed of P waves...
*October 24, 2011*

**physics**

the small piston of a hydraulic press has an area of 7.0 cm squared. if the applied force is 30.0 N, find the area of the large piston to exert a pressing force of 4000 N
*October 23, 2011*

**chemistry**

i do not know how to put those in words, can some one help me, please. CoCL2(s) + 2HF(g)= CoF2(s)+ 2HCL(g) and P6( NO3)2(aq) + 2KL(aq) = PbL2(s) +2KNO3(aq)
*October 21, 2011*

**chemistry**

i do not know how to put those in words, can some one help me, please. CoCL2(s) + 2HF(g)= CoF2(s)+ 2HCL(g) and P6( NO3)2(aq) + 2KL(aq) = PbL2(s) +2KNO3(aq)
*October 21, 2011*

**math**

•Divide the top of the fraction by the bottom, •Then multiply the result by 100 and read off the answer !
*October 20, 2011*

**Math**

Let x be the width of the 1st spider web. (x/2) is the width of the 2nd spider web. (x + 3) is the legnth of the 3rd spider web. all widths add up to 18 inches.
*October 20, 2011*

**Help With math**

(3x-2)^2=2 3x-2 = sqrt2 3x= sqrt2 + 2 x = (sqrt2 + 2) / 3
*October 20, 2011*

**5th grade math**

How do you divide 836 by 22, using compatible numbers? Is there a quick way to figure out the compatibility?
*October 19, 2011*

**5th grade math**

How do you divide 836 by 22, using compatible numbers? Is there a quick way to figure out the compatibility?
*October 19, 2011*

**Math**

you're welcome. bye.
*October 19, 2011*

**Math**

yes. It helps if you show the common factor of 4: 12% = 12/100 = (3 x 4)/(25 x 4) = 3/25
*October 19, 2011*

**Math**

Express 12% as a fraction, with 100 as the denominator......Yes (12/100)
*October 19, 2011*

**Math**

you're welcome
*October 19, 2011*

**Math**

yes. If you get 19/20 in a math test then you got 95 percent.
*October 19, 2011*

**Math**

•Divide the top of the fraction by the bottom, •Then multiply the result by 100 and read off the answer !
*October 19, 2011*

**Math**

"To round numbers to the nearest thousand, make the numbers whose last three digits are 001 through 499 into the next lower number that ends in 000. For example, 6424 rounded to the nearest thousand is 6000. Numbers that have the last three digits of 500 or more should be...
*October 19, 2011*

**Math (please help)**

Whatever you do to the left side of the equation, you have to do to the right side of the equation.
*October 19, 2011*

**Math (please help)**

give me another question then.
*October 19, 2011*

**Math (please help)**

n/3 - 8 = -2 (n/3) - 8 = -2 (n/3) - 8 + 8 = -2 +8 (n/3) = 6 (n/3) x 3 = 6 x 3 n = 18
*October 19, 2011*

**Science/ help with finding the independant variabl**

Forty students participated in groups of 4-6. They were given a questionnaire to test their knowledge of the Black cultural stereotype. Subjects were asked to list the components of the stereotype. After listing the components of the stereotype, subjects completed the Modern ...
*October 19, 2011*

**Math**

124 - 6 x (0 + 15) = 34
*October 19, 2011*

**Math**

Hair grows about one 1/2 inch each month. After you shave your head how many years will it be until your hair is 1 foot in length?
*October 18, 2011*

**Math: Calculus**

I'm sorry, I still dont understand
*October 17, 2011*

**Math: Calculus**

Assume that a population size at time t is N(t) and that N(t)=40 x 2^t , t>0. Show that N(t)=40e^t ln2 Can someone please guide me step by step on this question? Im really confused. thanks. I tried to work it out, and this is what I got. N(t)= 40 x 2^t = 40 x ln 2^t = 40 x ...
*October 17, 2011*