# When a tuning fork of unknown frequency is sounded simultaneously with a 512 Hz tuning fork, 20 beats are heard in 4.0 seconds. What are the possible frequencies of the unknown tuning fork?

7,356 questions, page 58-
## Physics

The length of a string is 344 cm. The string is held fixed at each end. The string vibrates in two sections; i.e., the string has two antin- odes, and the string vibrates at 130 Hz. Find the wavelength. Answer in units of m. What is the fundamental

*asked by AJ on October 5, 2012* -
## Physics

A 150 gram mass is attached to a horizontally aligned spring on a frictionless surface. A force of 10 Newtons will stretch the spring 25 centimeters. If the spring is compressed to 15 centimeters and then released, calculate: the spring constant; the

*asked by Bobby on May 1, 2019* -
## chemistry

An unknown compound contains only carbon, hydrogen, and oxygen (CxHxOx). Combustion of 3.50G of this compound produced 5.13G of carbon dioxide and 2.10G of water A.How many moles of carbon, , were in the original sample? b. How many moles of hydrogen, ,

*asked by URGENT! on February 8, 2014* -
## science

A piece of unknown metal with mass 68.6 g is heated to an initial temperature of 100 °C and dropped into 84 g of water (with an initial temperature of 20 °C) in a calorimeter. The final temperature of the system is 52.1°C. The specific heat of water is

*asked by jashawun on March 5, 2019* -
## Chemistry

Organic chemistry: an attempt at synthesizing a certain optically active compound resulted in a mixture of its enantiomers. The mixture had an observed specific rotation of 11.0 degrees. If it is known that the specific rotation of the R enantiomer is

*asked by Tokey on November 4, 2010* -
## Chemistry

2. A fluoride electrode is used to determine fluoride in a water sample. Standards and samples are diluted 1:10 with TISAB solution. For a 1.00 x10-3M(before dilution) standard, the potential reading relative to the reference electrode is -211.3mV and for

*asked by Glyn on October 21, 2014* -
## Chemistry

I have a 0.6573g mixture of NaHCO3 and Na2CO3. Calculate the mass of NaHCO3 and Na2CO3 in the unknown mixture.Also calculate the mass of NaCl formed in the reaction of the mixture and HCl.

*asked by Sam on October 20, 2016* -
## Math

3 pumps were used to empty a pond hold an unknown amount of water. If pump 1 can empty it in 4 days, pump 2 in 10 days and #3 in 5 days, how many days will it take to empty the pond if all 3 are running at the same time?

*asked by Emily on March 8, 2015* -
## physics

A person bounces up and down on a trampoline, while always staying in contact with it. The motion is simple harmonic motion, and it takes 2.82 s to complete one cycle. The height of each bounce above the equilibrium position is 40.8 cm. Determine (a) the

*asked by Sarah on February 2, 2009* -
## Biology

8. Presenting with symptoms of recurrent infections, weakness, and frequency of urination over a 6 month period, a 34-year-old man is found to have a blood glucose level of 142 mg/dl and an elevated hemoglobin A1c level. His most likely diagnosis is: A.

*asked by AMG,RN,BSN on May 1, 2016* -
## physics

as Sue runs, her knee joint passes through the following vertical positions (meters): Frame 1: .043 Frame 2: .145 Frame 3: .21 Frame 4: .39 Frame 5: .415 The data were collected at a frequency of 100 Hz. What was the vertical velocity of her knee joint at

*asked by chris on June 15, 2014* -
## Econ stats

Sidney Crosby’s score statistics for the regular 2007 championship season were used to construct the following table: Experimental Outcome (x), Number of Occurrences during the 2007 Season (0, 358) (1, 175) (2 28) (3 3) (4 10) a. Use the relative

*asked by Maya on November 2, 2017* -
## physics

A tray is moved horizontally back and forth in simple harmonic motion at a frequency of f = 1.68 Hz. On this tray is an empty cup. Obtain the coefficient of static friction between the tray and the cup, given that the cup begins slipping when the amplitude

*asked by stressedstudent on November 12, 2012* -
## Physics: HELP PLS

The speed of a wave in a string is given by v = Ö(FT/m), where FT is the tension in the string and m = mass / length of the string. A 2.00 m long string has a mass of 15.5 g. A 93 g mass is attached to the string and hung over a pulley. The end of the

*asked by Nopie on November 29, 2016* -
## writing

true or false 1) Charts, tables and graphs are effective methods of clarifying facts and statistics. TRUE 2) Wikipedia is an acceptable source to cite in a speech. FALSE 3) When finding and evaluating research; information from an unknown blog is

*asked by Anonymous on May 10, 2012* -
## college

1. Which of the following statements are correct? a. A normal distribution is any distribution that is not unusual. b. The graph of a normal distribution is bell-shaped. c. If a population has a normal distribution, the mean and the median are not equal.

*asked by Jay on August 1, 2010* -
## Statistics

1. Which of the following statements are correct? a. A normal distribution is any distribution that is not unusual. b. The graph of a normal distribution is bell-shaped. c. If a population has a normal distribution, the mean and the median are not equal.

*asked by Andrew on March 11, 2011* -
## Physics 12

This came up on our test review for tomorrow, and I'm stumped! "A hockey puck of mass 0.51 kg is moving north across the ice with a speed of 32 m/s. If it is hit with a hockey stick so as to make it travel due west at the same speed, what is the magnitude

*asked by solexgirl12 on October 28, 2008* -
## physics

An unknown liquid fills a square container of sides 10 m. What is the density of a material if the pressure 5 m below the surface is 1.6 atm? Assume g=10 m/s^2 and the pressure at the surface of the liquid is 1 atm. Also assume that 1 atm = 10^5 Pa. (Hint:

*asked by Pri on March 25, 2013* -
## statistics

The distribution of B.A. degrees conferred by a local college is listed below, by major. Major Frequency English 2073 Mathematics 2164 Chemistry 318 Physics 856 Liberal Arts 1358 Business 1676 Engineering 868 9313 What is the probability that a randomly

*asked by Bob on April 16, 2015* -
## Physics

A weight suspended from a spring is seen to bob up and down over a distance of 11 cm twice each second. What is its frequency? Answer in units of Hz. 002 (part 2 of 3) 10.0 points What is its period? Answer in units of s. 003 (part 3 of 3) 10.0 points What

*asked by Chris on February 6, 2015* -
## Physics

A 50 g sample of an unknown metal is heated to 90.0C. It is placed in a perfectly insulated container along with 100 g of water at an initial temperature of 20C. After a short time, the temperature of both the metal and water become equal at 25C. The

*asked by Jon on February 14, 2016* -
## Physics

A 50 g sample of an unknown metal is heated to 90.0C. It is placed in a perfectly insulated container along with 100 g of water at an initial temperature of 20C. After a short time, the temperature of both the metal and water become equal at 25C. The

*asked by Anonymous on February 14, 2016* -
## Physics

Not sure where to begin with this question--any help appreciated! Two kids sitting on opposite sides of a small lake use sticks to beat the surface of the water at a frequency f=1.5 Hz. They notice that a standing wave pattern develops between the points

*asked by Jamie on December 8, 2016* -
## Chemistry

A 15mL sodium hydroxide solution of unknown concentration is titrated with 34.5 mL of 1.2M HCl solution. What was the concentration of the sodium hydroxide solution?

*asked by Jo on April 23, 2012* -
## physics

You are watching an archery tournament when you start wondering how fast an arrow is shot from the bow. Remembering your physics, you ask one of the archers to shoot an arrow parallel to the ground. Unfortunately the archer stands on an elevated platform

*asked by michaelJ on November 17, 2010* -
## Chemistry

Mass of an empty flask and stopper is 55.844g. 5mL of an unknown liquid is added and heated in a water bath at 99.7 degrees C. It then cools down. The stopper is removed and then replaced. The weight of all of this is 56.101g. The volume of the flask is

*asked by Gg on October 21, 2014* -
## Distillation Lab Calculations

I had to do a fractional distillation while my lab partner did a simple distillation. I had 2 unknown compounds which could have been any of the following: heptane, cyclohexane, toulene, octane, Well I think I went and boiled the solution a little too

*asked by ~christina~ on September 26, 2007* -
## Chemistry

The energies, E, for the first few states of an unknown element are shown here in arbitrary units: n= 1, E=-21 n=2, E=-9 n=3, E=-4 n=4, E=-3 ...,... infinity, 0 A gaseous sample of this element is bombarded by photons of various energies (in these same

*asked by tec on March 19, 2014* -
## Chemistry

In a thermochemistry experiment the reaction of 0.0857 g of an unknown metal and an excess of 4.0 M HCl resulted in a 0.210 mL decrease in the volume of an ice/water mixture. Calculate the enthalpy of this reaction per 1 g of metal reacted. Needed data:

*asked by Raj on December 1, 2007* -
## trig

1. 3cot^2 (x) - 1 = 0 My answer: pi/3, 2pi/3, 4pi/3, 5pi/3 2. 4cos^2 (x) - 1 = 0 My answer: pi/3, 2pi/3, 5pi/3, 4pi/3 3. 2sin (x) + csc (x) = 0 My answer: unknown lol i got to the part: sin^2 (x) = -1/2 4. 4sin^3 (x) + 2sin^2 (x) - 2sin^2 (x) = 1

*asked by Wanda on May 9, 2008* -
## Chemistry

100 ml of 15 g/L silver nitrate reacts with an unknown concentration solution of copper (ll) chloride. the reaction for me only 2 grams of silver (l) chloride. If 75 mL of the copper (ll) chloride solution was mixed in, what is the initial concentration of

*asked by Hannah on March 23, 2015* -
## physics

A square loop (side L) spins with angular frequency ω in field of strength B. It is hooked to a load R. Write an expression for current I(t) in terms of B,L,R,ω and t (enter omega for ω). (b) How much work is done by the generator per revolution?

*asked by Ulises on April 9, 2013* -
## Physics

Bats chirp at high frequencies that humans cannot hear. They use the echoes to detect small objects, such as insects, as small as one wavelength. If a bat emits a chirp at a frequency of 60.0 kHz and the speed of sound waves in air is 340 m/s, whar is the

*asked by Antwon on January 8, 2018* -
## Algebra

You are planning to build a walkway that surrounds a rectangular garden that is 10ft by 9ft. The width of the walkway around the garden is unknown, but it will be the same on every side. a)what is the perimeter of the walkway along the outer edge ? b) what

*asked by Naibe on January 24, 2013* -
## Physics

A ball is ejected to the right with an unknown horizontal velocity from the top of a pillar that is 50 meters in height. At the exact instant, a carriage moving on rails is also released to the right from the bottom of the pillar. Calculate the velocity

*asked by Lauren01 on February 22, 2012* -
## phsice

A block of weight W = 17 N, which can slide without friction on a 32.5° incline, is connected to the top of the incline by a massless spring of unstretched length xo = 0.34 m and spring constant k = 225 N/m. By how much will the spring be stretched when

*asked by selen on December 18, 2015* -
## Math

Please forgive me, but I am appealing to you to please solve these 6 problems for me in the most simpler of steps that I can use to practice. Thanks so much. Garnett 1. Purchaser applies for an FHA loan to buy home for $102,000. FHA guarantees 97% of first

*asked by Garnett on June 22, 2011* -
## College algebra

system of linear equation The sum of 3 numbers is 14 the largest is 4 times the smallest the sum of the smallest and twice the largest is 18 what are the 3 numbers? show work? A. how many unknowns you have? -how many equations need to be solve for that

*asked by YANETH on November 1, 2011* -
## MATH

system of linear equation The sum of 3 numbers is 14 the largest is 4 times the smallest the sum of the smallest and twice the largest is 18 what are the 3 numbers? show work? A. how many unknowns you have? -how many equations need to be solve for that

*asked by YANETH on November 1, 2011* -
## Physics

The system of blocks of masses m1=3kg and m2 = 1.80 kg are connected by a string as shown. Mass m rests on a rough surface of unknown coefficient of kinetic friction. After the masses are released, they move with an acceleration of 2.80 m/s^2 (m1 moves to

*asked by Matt on February 20, 2007* -
## physics

A 10 g particle undergoes Simple Harmonic Motion with an amplitude of 2.0 mm, a maximum acceleration of magnitude 8.0 X 10^3 m/s^2, and an unknown phase constant, theta. What are a.) the period of the motion, b.) the maximum speed of the particle, and c.)

*asked by Scott on November 30, 2010* -
## Writing Inequalities

I need some help with this problem. A number is less than the sum of twice its opposite and five. Find the number. Thank you for your help!!! If by "its opposite" you mean the same number with opposite sign, then if you let x be that unknown number x < -2x

*asked by meme1993 on December 6, 2006* -
## Math

You use a line of best fit for a set of data to make a prediction about an unknown value. The correlation coefficient for your data is -0.993. How confident can you be that your predicted value will be reasonably close to the actual value? a. I can't be

*asked by Kaai97 on December 14, 2015* -
## physics

A uniform, 264-N rod that is 2.05 m long carries a 225-N weight at its right end and an unknown weight W toward the left end. When W is placed 47.9 cm from the left end of the rod, the system just balances horizontally when the fulcrum is located 82.7 cm

*asked by Matt on April 2, 2013* -
## Chemistry

Sorry to post again but I'm really stuck on this one! I'm doing some post lab questions and I'm stuck on one. In lab we performed Tollens test, Fehlings test, and Jones Oxidation to differentiate our unknown between an aldehyde or a ketone. The question

*asked by hayley on July 16, 2013* -
## chemistry

a 225.0 g sample of an unknown, silver, pure metal was heated to 95.5 degrees celsius then put into 150.50 g of water at 22.5 degrees celsius. the water was heated by the hot metal to a temperature of 31.4 degrees celsius. what is the specific heat? what

*asked by brittany on March 18, 2013* -
## Chemistry

Ethanol burns to produce 1300.0 kJ/mol and has a heat capacity of 65.6 J/mol·K. If Dr. Porter has 1.00 L of liquid ethanol (density = 0.789 g/mL), what is the minimum mass of fuel that should be removed and burned to heat the remaining ethanol from 25 °C

*asked by Melissa on November 9, 2010* -
## Statistics

Can someone please help with this? A measurement follows the normal distribution with a standard deviation of 15 and an unknown expectation μ. You can consider that measurement to be the "original" distribution. Two statisticians propose two distinct ways

*asked by Gracio on May 30, 2017* -
## Chemistry

A 1.065-g sample of an unknown substance is dissolved in 30.00 g of benzene; the freezing point of the solution is 4.25 degrees C. The compound is 50.69% C, 4.23% H, and 45.08% O by mass. Info you might need on benzene: Normal Freezing point,degrees C:

*asked by JJ on February 25, 2013* -
## Geometry

I have a rectangle MNOP ~ rectangle STUV. What is the length of line TU?? First rectangle is MNOP with 10 on top and 4 on the side. Second rectangle is STUV. With the top marked X for the unknown number and n the side is 6. I need help solving this. Do you

*asked by R on March 5, 2016* -
## Physics

YOu are creating a transverse wave in a rope by shaking your hand from side to side. Without changing the distance that your hand moves, you begin to shake it slower and slower. What happens to the frequency? it decreases?? 2. For incomplete cancellation

*asked by mark on October 17, 2008* -
## math

what would the dimensions of a retangle be whose perimeter is 50(P=50)inches when the length is 2x-5 ane the width is unknown The width must be 25 - (2x-5) = 30-2x, since the sum of the length and width must be half the perimeter. You do not have enough

*asked by Sissy on April 22, 2007* -
## bobpursly & countiblis,math

I thought that we can solve anything with equations is it always polynomials. Isn't this the same thing as finding the unknown for an equation. As i said in my previous message or am i wrong. Also what about the rational expressions what are some

*asked by jas20 on March 5, 2007* -
## Physics

1.The mass of a string is , and it is stretched so that the tension in it is 180 N. A transverse wave traveling on this string has a frequency of 260 Hz and a wavelength of 0.60 m. What is the length of the string? 2.A rocket engine emits of sound energy

*asked by Jena on December 6, 2006* -
## Physics

A small bead of mass m and charge q is free to move in a horizontal tube. The tube is placed in between two spheres with charges Q = − q. The spheres are separated by a distance 2a. What is the frequency of small oscillations around the equilibrium point

*asked by Petra Tanovic on September 3, 2013* -
## adverb question

i have to fill in the blank: adverbs of time tell ___ something happens. I wrote: when adverbs of frequency tell ___ something happens. i wrote : how often or is it also when? can you check this? i have an ARTICLES EXCERCISE 1) ARTICLES ARE USE WITH: a

*asked by marko on December 7, 2011* -
## physics

1) Sound propagating through air at 30 degree Celsius passes through a vertical cold front into air that is 40 degree Celsius. If the sound has a frequency of 2400 Hz, by what percentage does its wavelength change in crossing the boundary? (2) What is the

*asked by Sandhya on November 9, 2008* -
## physics

Coherent light of frequency 6.38×1014 Hz passes through two thin slits and falls on a screen 80.0 cm away. You observe that the third bright fringe occurs at ± 3.08 cm on either side of the central bright fringe. How far apart are the two slits? At what

*asked by ChrismB on May 23, 2016* -
## Physics help please!

The speed of a deep water wave with a wavelength ë is given approximately by v = (gë/2ð)1/2. Find the speed and frequency of a deep water wave with a wavelength of 5.5 m. ? m/s ? Hz can someone get me started with a formula? I lost my book :(

*asked by kelsey on November 9, 2008* -
## physics....

Suppose that the inside length of a microwave oven is 30 cm. If the length of a microwave oven is one half of the wavelength of microwaves used by the oven, find the frequency of the microwaves used in the oven. What is the equation that relates the three

*asked by kennedy on June 13, 2012* -
## Physics

A ray of light of frequency is 5.09 x 10^14 Hz is traveling from water to medium X. The angle of incidence in water is 45 degrees and the angle of refraction in Medium X is 29 degrees. Calculate the index of refraction

*asked by Jeshondria on April 18, 2011* -
## physics

A vertical scale on a spring balance reads from 0 to 220N . The scale has a length of 15.0cm from the 0 to 220N reading. A fish hanging from the bottom of the spring oscillates vertically at a frequency of 2.45Hz . Part A Ignoring the mass of the spring,

*asked by Becca on December 10, 2013* -
## physics

A compact car has a mass of 1150 kg. Assume that the car has one spring on each wheel, that the springs are identical, and that the mass is equally distributed over the four springs. (a) What is the spring constant of each spring if the empty car bounces

*asked by Hannah on March 31, 2014* -
## math, pre- statistics

Hospital records indicated that maternity patients stayed in the hospital for a number of days shown in the distribution Days Stayed Frequency 1 34 2 23 3 17 4 11 5 8 If a patient's records are selected calculate the probability of each event. A patient

*asked by Sabrina on February 6, 2009* -
## Physics

When light of wavelength 391 nm falls on a potassium surface, electrons are emitted that have a maximum kinetic energy of 1.72 eV. 1) What is the cutoﬀ wavelength of potassium? Answer in units of nm 2)What is the threshold frequency for potassium? Answer

*asked by Jason on May 11, 2012* -
## physics

Coherent light of frequency 6.30 1014 Hz passes through two thin slits and falls on a screen 75.0 cm away. You observe that the third bright fringe occurs at ±3.06 cm on either side of the central bright fringe. (a) How far apart are the two slits? I got

*asked by Kendyll on April 24, 2017* -
## physics

Which one of the following statements about standing waves on a string is FALSE? Select one: a. All other frequencies are integer multiples of the first harmonic b. The first harmonic is the lowest frequency standing wave that can be formed. c. The first

*asked by jake on June 16, 2014* -
## Physics

Coherent light of frequency 6.32 * 10^14 Hz passes through two thin slits and falls on a screen 85 cm away. You observe that the third bright fringe occurs at +- (plus or minus) 3.11 cm on either side of the central bright fringe. (a) How far apart are the

*asked by J on April 21, 2008* -
## physics

A piston of a car engine executes a simple harmonic motion. the acceleration a of the piston is related to its displacement x by the equation: a = -6.4*10^5x a) Calculate the frequency of motion b) The piston has a mass of 700 gms & a max displacement of 8

*asked by Saeed on September 23, 2014* -
## physics - I don't know what's wrong

A spring with a force constant of 111 Nm is attached to the ceiling. When an unknown mass is attached it pulls the spring down 0.340m to its equilibrium position. The mass is then pulled 9cm below its equilibrium position and oscillates back and forth.

*asked by anonymous on January 9, 2018* -
## math

Between a bar graph and a line graph which one is more appropriate for displaying the number of individuals of dffering ages at a picnic. We are provided the ages brackets and frequency. I say it is a bar graph since line graphs are better for over time

*asked by m on November 18, 2010* -
## statistics

Class frequency 5-29---------------2 30-54--------------------3 3 55-79--------------------4 80—104 5 105-129 2 130-154 1 155-179 1 PC =3(X-Median)/s median = L +((N/2) – CF)/f *(h) L=55 (N/2)=9 h=24 f= 4 It is says that median is 77.5, and I could not

*asked by samty on March 4, 2012* -
## Physics

A compact car has a mass of 1400kg. Assume that the car has one spring on each wheel, that the springs are identical, and that the mass is equally distributed over the four springs. What is the spring constant of each spring if the empty car bounces up and

*asked by falcon306 on July 30, 2011* -
## Physics

Question 1: Dan is pulling on his dog’s leash, the dog is pulling with 40N of force and Dan is pulling with 50N of force, how fast are they going after 2 seconds? Question 2: If you want to throw a rock 50m with a 1 m sling, what frequency do you need to

*asked by Mike on June 9, 2016* -
## chemistry

Lab on Determining hard water Not sure if I answered this currently, not completely sure how to explain either. If a student has a non-zero blank correction, but forgets to include that correction in his/her calculations:? a. Would his/her calculated

*asked by Ahmad on January 18, 2013* -
## chemistry

Lab on Determining hard water Not sure if I answered this currently, not completely sure how to explain either. If a student has a non-zero blank correction, but forgets to include that correction in his/her calculations:? a. Would his/her calculated

*asked by Ahmad on January 17, 2013* -
## Chemistry

Using the technique of the previous problem ΔE was found to be -2,000.00 kJ/mol of an unknown liquid hydrocarbon at 298 K. In another experiment it was determined that for each mole of hydrocarbon, 4 moles of oxygen gas are consumed and 6 moles of CO2 gas

*asked by John Handra on March 31, 2015* -
## Chemistry

An object of unknown metal has the following dimensions: 5.00cm long, 2.00cm wide, and 3.00cm tall. The mass of the block is known to be 79.5g. #10 What is the formula for density? 1 point D = V/m D = m/V * D = g/mL D = m x V #11 What is the volume of the

*asked by Ben Folds on February 6, 2019* -
## AP Chemistry

A 5.0 M solution of HNO3 is titrated with 0.3 M NaOH. Identify the species that have the highest concenttrations in the solution being titrated halfway to the equivalence point. A 25.15 ml of 0.35 m HNO3 was titrated with an unknown concentration of NaOH.

*asked by Sara on March 29, 2015* -
## Physics - Mechanics

A body is supported by a spiral spring and causes a stretch of 1.5cm in the spring. If the mass is now set in vertical oscillation of small amplitude, what is the periodic time of oscillation Doesn't angular frequency= sqrt (k/m) ? where k= mg/.0015 or

*asked by Febby-1 on April 12, 2007* -
## Physics

A particle P of mass m kg is attached to two fixed points A and B by two identical model springs, each of stiffness k and natural length lo. The point A is at a height 1/4lo above the point B. The particle is free to oscillate vertically under gravity. The

*asked by Prissy on March 30, 2013* -
## physics

The red laser light used in supermarket scanners has a wavelength of 633 x 10-9 m. (This is 633 nanometers, 633 nm). Find the frequency of the red laser light.

*asked by Tim on April 16, 2012* -
## 7th grade Science

What is the relationship between energy and the wavelength of an electromagnetic wave? I really need help because I know that the shorter the wavelength of an electromagnetic wave, the higher the frequency of the wave..but I don't know how this is relevant

*asked by Anonymous on December 29, 2011* -
## organic chemistry laboratory

hi, im not sure if all my answers are correct especially number 5. could any one check and tell me? please and thank you. 1. Why is it important to have clean test tubes before running a test? Before which tests should acetone not be used to clean the test

*asked by Niah on November 2, 2014* -
## organic chemistry laboratory

hi, im not sure if all my answers are correct especially number 5. could any one check and tell me? please and thank you. 1. Why is it important to have clean test tubes before running a test? Before which tests should acetone not be used to clean the test

*asked by Niah on November 4, 2014* -
## Engineering Math Growth

I am having trouble figuring out where to start with this one. Biologists stocked a lake with 40 ﬁsh and estimated the carrying capacity (the maximal population for the ﬁsh of that species in that lake) to be 300. (a) Assume that the number of ﬁsh

*asked by Erica on September 26, 2016* -
## Science

Prior to the detonation of the first atomic bomb, had the scientist been able to prove by theory that the reaction would stop? I assume they did considering they continued with the test. If not, how was Bethe able to calculate the yield of the explosion?

*asked by Dave on June 25, 2007* -
## Chemistry lab

In my lab class I am having to write a lab experiment and preform it tomorrow. It deals with specific heat of unknown metal and density. the first part you have boil water with the metal in it, and then put it in a cup and measure the temp change. I have

*asked by Paco on November 5, 2012* -
## Physics

A hypothesis says the upper limit in frequency a human ear can hear can be determined by the diameter of the eardrum, which should have approximately the same diameter as the wavelength at the upper limit. Using the hypothesis what would be the radius of

*asked by Maddy on February 21, 2010* -
## Chemistry

A sample of g 0.2050 oxalic acid (4.2 H2C2O H2O) required 25.52 mL of KOH solution to complete the neutralization according to rea tion: HOOCCOOH + 2 KOH + KOOCCOOK ↔ H2O Which the concentration in mol L-1 of this KOH solution? A sample of an unknown

*asked by Michaela on April 13, 2016* -
## math

Justin has a deck of cards with letters on them. The table below shows the results of justin randomly drawing a card,putting it back,shuffling the deck,and randomly drawing another card many times. Letter of card/frequency A/15 E/19 I/13 O/8 U/6

*asked by Mark mark on January 21, 2015* -
## Chemistry

If the concentration of a reactant is decreased, will the speed of the reaction increase or decrease? Explain. I understand that if the concentration of a reactant is INCREASED, the frequency of coliision increases, making the rate of reaction increase.

*asked by Alexandra on January 31, 2012* -
## Physics

A block rides on a piston that is moving vertically with simple harmonic motion. (a) If the SHM has period 3.1 s, at what amplitude of motion will the block and piston separate? (b) If the piston has an amplitude of 9.6 cm, what is the maximum frequency

*asked by Jake on February 22, 2011* -
## Physics: Simple Harmonic Motion

A 10kg particle undergoes simple harmonic motion with an amplitude of 2.0mm, a maximum acceleration of 8.0x10^3 m/s^2, and an unknown phase constant (phi) What are: a.) the period of the motion b.) the maximum speed of the particle c.) total mechanical

*asked by Greg on December 1, 2010* -
## Physics

A 10kg particle undergoes simple harmonic motion with an amplitude of 2.0mm, a maximum acceleration of 8.0x10^3 m/s^2, and an unknown phase constant (phi) What are: a.) the period of the motion b.) the maximum speed of the particle c.) total mechanical

*asked by Greg on November 30, 2010* -
## Physics

A horizontal spring is lying on a frictionless surface. One end of the spring is attaches to a wall while the other end is connected to a movable object. The spring and object are compressed by 0.076 m, released from rest, and subsequently oscillate back

*asked by Erick on March 4, 2013* -
## Physics

A horizontal spring is lying on a frictionless surface. One end of the spring is attaches to a wall while the other end is connected to a movable object. The spring and object are compressed by 0.074 m, released from rest, and subsequently oscillate back

*asked by Tim on March 3, 2013* -
## Physics (Please Help)

An astronaut lands on an alien planet. He places a pendulum (L = 0.200 m) on the surface and sets it in simple harmonic motion. a. What is the period and frequency of the pendulum’s motion? b. How many seconds out of phase with the displacements shown

*asked by Mishaka on December 12, 2011* -
## physics

A siren is producing a tone of frequency 10000 Hz, and a handheld decibel meter (like the one I use in class) is reading 20 dB. We've talked in class about how your perception of qualitative loudness (in phons) does not always match exactly with the meter.

*asked by dreadantlers on March 10, 2011*