# 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 38-
## physics

A marine siren consists of a cylinder 72 cm in length closed at one end.for sound through air at 336 m/s. find the lowest frequency of the siren

*asked by omar on June 4, 2016* -
## Physics

A guitar string is 108 cm long and has a mass of 2.90 g. From the bridge to the support post (L) is 70 cm, and the string is under a tension of 470 N. What is the frequency of the first overtone? Only 1 try left please help.

*asked by Anon on July 7, 2016* -
## physics

Light with a frequency of 4.32 × 1015 Hz strikes a metal surface and ejects electrons that have a maximum kinetic energy of 5.8 eV. What is the work function (in eV) of the metal?

*asked by John on March 25, 2013* -
## physics

A 85.0 kg person steps into a car of mass 2500.0 kg, causing it to sink 2.5 cm. Assuming no damping, with what frequency will the car and passenger vibrate on the springs?

*asked by help? on April 28, 2008* -
## physics

Two speakers 14m apart are emitting tones at a frequency of 1020 Hz. what is the closest distance (in m) from one speaker, along the line connecting the speakers, at which the sound intensity will be zero?

*asked by Dana on December 1, 2010* -
## physics

A guitar string is 97 cm long and has a mass of 3.6 g. The length L from the bridge to the support post is 61 cm, and the string is under a tension of 570 N. What is the frequency of the fundamental tone?

*asked by kassy on December 5, 2016* -
## Physics

In a certain cyclotron a proton moves in a circle of radius 0.5m. The magnitude of the magnetic field is 1.2T. a) What is the oscillator frequency? b) What is the final kinetic energy of the proton?

*asked by Ri on November 24, 2010* -
## physics

A loudspeaker diaphragm is vibrating in simple harmonic motion with a frequency of 430 Hz and a maximum displacement of 0.90 mm. what is the max speed? what is the max acceleration?

*asked by Help Please! on January 22, 2011* -
## physics

an RlC circuit has a resistance of 4 kOhm, a capacitance of 33 uF, and an inductance of 23 H. if the frequency of the alternating current is 2/pi kHz, what is the phase shift between the current and the voltage.

*asked by fatih on March 10, 2012* -
## Physics

You are standing on a beach and 5 wave crests land on shore in 50 seconds. Each wave is 32m apart. Find Frequency, period, wavelength and speed.

*asked by Andrea on April 2, 2013* -
## Physics

Simple Harmonic Motion Problem Amplitude=10cm=0.1m , period=1s, angular frequency= 6.28 rad What is the maximum speed of the mass during this motion?

*asked by Alex on May 4, 2017* -
## Bio

Given an allele frequency of o.91 for a hypothetical red allele (bead), the percentage of blue alleles residing in the heterozygotes would be? a) 89% b) 90% c) 91% d) 92% e)93% i don't even know how to approach this question

*asked by kim on October 6, 2010* -
## Chemistry

All electromagnetic energy (light), including gamma rays through radio waves, has what in common? A. Speed B. Wavelength C. Frequency D. Energy E. Amplitude I think a

*asked by Morgan on December 11, 2014* -
## Physics

A 2.2 m-long string is fixed at both ends and tightened until the wave speed is 50 m/s.What is the frequency of the standing wave shown in the figure? picture has 6 waves

*asked by Unknown on November 8, 2009* -
## Chemistry

When light having a wavelength of 497 nm strikes a metal coating of an emitter, an elector with kinetic energy of 2.52 x 10^-19 is ejected. What is the threshold frequency for this metal?

*asked by Kamila on March 28, 2011* -
## chemistry

The blue color of the sky results from the scattering of sunlight by air molecules. The blue light has a frequency of about 7.5 * 10^14 Hz. What is the wavelength of this radiation in nanometers?

*asked by Eddie on February 14, 2012* -
## Statistics

A football team’s coach predicts that his team will win 9 out of 10, or 90%, of its games. Which method did he most likely use to make this prediction my answer to this is relative frequency is this correct

*asked by Jacob on June 14, 2010* -
## PHYSICS

1. Write an expression for a R - state lightwave of angular frequency and amplitude E0 propagating in the positive x-direction such that at t=0 and x=0 the E-field points in the negative z-direction.

*asked by NOONY on November 22, 2015* -
## science-urgent

On my homework there's a diagram of a flying bird with the allele of aa and then there's an arrow pointing to the land with 3 birds on the ground with the alleles AA. What would the allele frequency of A change from? A)1 to .75 B)0 to .25 C)0 to .75 D)1 to

*asked by jon on December 10, 2011* -
## Physics

A train is sounding a horn of constant frequency shows down as it nears a station. What change in pitch is heard by a commuter standing in the station?

*asked by Sylvia on May 3, 2010* -
## physics

A guitar string is 92 cm long and has a mass of 3.7 g. The length L from the bridge to the support post is 65 cm, and the string is under a tension of 570 N. What is the frequency of the fundamental tone thanks!

*asked by BG on May 14, 2013* -
## Science/Math

A radio wave has a frequency of5,000,000 Hz. Write this number in scientific notation. ????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????? This is not the right answer so hurry up as

*asked by Megan on February 12, 2007* -
## science-biology

On my homework there's a diagram of a flying bird with the allele of aa and then there's an arrow pointing to the land with 3 birds on the ground with the alleles AA. What would the allele frequency of A change from? A)1 to .75 B)0 to .25 C)0 to .75 D)1 to

*asked by jon on December 10, 2011* -
## Physics (Intro)

Initially, a spring-mass system completes 20.0 vibrations in 5.0 seconds, with a 2.0 cm amplitude. The same mass is pulled 5.0 cm away from the equilibrium position, then released. What will the frequency be?

*asked by Jim on June 19, 2013* -
## Electric circuit and Electronics

A triangular wave of +-12v amplitude and 10Mhz frequency is generated at the output of an op-amp.Calculate the minimum slew rate of the op-amp used.

*asked by gourav bhardwaj on March 17, 2016* -
## Physics

An ac power supply with frequency 60 Hz is connected to a capacitor C=40uF. The maximum instantaneous current that passes through the circuit is 2.26A. What is the maximum voltage?

*asked by SomeoneSexy on April 6, 2016* -
## physics

A fisherman's scale stretches 2.1 cm when a 2.3-kg fish hangs from it. What will be the frequency of vibration if the fish is pulled down 3.8 cm more and released so that it vibrates up and down? if you answer please show your work.

*asked by Anonymous on June 6, 2018* -
## physics

Vibration of the dishwasher causes standing waves in a cup. crests form four concentric rings and the diameter of the cup is 6.0cm v=1.5m/x . What is the frequency of the vibrations?

*asked by m on October 12, 2011* -
## math

The spring runoff from melting snow from a certain region is being accumulated in a reservoir. The reservoir is 450 yards long; and its ross-section is an isosceles triangle 40 yards wide at the top and 20square root(3) yards high. Water is flowing into

*asked by Voh on May 2, 2010* -
## chemistry

31.0mL sample of LiOH, concentration unknown, is titrated with .52 M HCl. It takes 42.9 ml of HCl to reach the endpoint. What is the concentration of the base?

*asked by kendra on April 26, 2012* -
## physics

AHHHHHH Help!! Mass on string of unknown length oscillates witha period of 6.0s What if string length is doubled? amplitude dbl?

*asked by pam on February 27, 2011* -
## Chemistry

The density of an unknown metal is 1.55 and its atomic radius is 0.197 . It has a face-centered cubic lattice. What is the atomic weight of this metal?

*asked by Amanda on February 20, 2010* -
## math

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.

*asked by Anonymous on February 17, 2013* -
## Math

A piece of aluminum with an unknown mass ios at 85c and is placed in a 2.00 liters of water at 25.0c. The final temperature becomes 33c. What is the mass of aluminum?

*asked by Dave on November 8, 2012* -
## Chemistry

A 495-mL sample of unknown HCl solution reacts completely with Na2CO3 to form 18.1g CO2. What was the concentration of the HCl solution?

*asked by Jenn on May 5, 2014* -
## Science

Propose a series of concentration to be used for calibration curve. If an unknown solution produced a result outside the range of the calibration curve, how could this be solved?

*asked by Okafor on September 15, 2014* -
## math

Solve each inequality 1. m-75= 3. p+5

*asked by Elizabeth on November 18, 2016* -
## Chemistry

A 327- ML sample of unknown HCI solution reacts completely with Na2CO3 to form 20.1 g CO2 What was the concentration of the HCI solution?

*asked by Cathy Miller on November 30, 2010* -
## Algebra

One number is 3 times another. If the sum of their reciprocals is 4, find the two numbers. __ 15 this is supposed to be 4 over 15 Let the smaller number be x. The two numbers are then x and 3x. You have only one unknown now. 1/x + 1/(3x) = 4 4/(3x) = 4

*asked by Daniela on October 29, 2006* -
## Math

How do I use pythagorean theorem if I already know what c is, but I am missing one of the legs? If you know the length of one of the legs, a (besides the hypotenuse, c), then use b^2 = c^2 - a^2 and solve for the unknown leg length, b. This only works IF

*asked by Mark on November 28, 2006* -
## chemistry

A 337-\rm mL sample of unknown \rm HCl solution reacts completely with \rm Na_2CO_3 to form 17.1g \rm CO_2. What was the concentration of the \rm HCl solution?

*asked by Lauren on April 7, 2013* -
## Elem. Ed.

Please look over these questions and my answers to see if I have chosen the most appropriate answer. 1. Luis is being introduced to the finger play "Friends at Play." It is very likely that Luis will: A. do the finger movements first. B. learn the words

*asked by Anonymous on September 17, 2007* -
## dma 040

Substitute the given values into the given formula and solve for the unknown variable. If necessary round to one decimal place. (use approximation 3.14(pie symbol). C+2(pie symbol)r; C=40.8 r=

*asked by Anonymous on September 16, 2013* -
## Chemistry

A sample of neon effuses from a container in 80 seconds. The same amount of an unknown noble gas requires 163 seconds Identify the gas.

*asked by Anonymous on August 10, 2013* -
## chemistry

A 50g chunk of metal (c=0.0506 j/g°C) is heated to 60°C. it is then dropped into a calorimeter(c=1.40 j/g°C,m=5.0 g)that contains 100.0g of an unknown liquid. the temperature of the liquid raises from 15°C to 20°C.What is the c of the calorimeter?

*asked by liz on September 23, 2014* -
## chemistry

a 23.8 g sample of unknown metal heated at 100 degrees c is placed in 50.0 mL of water at 24 degrees c resulting in 8.5 c temperature increase. What is the specific heat of the metal

*asked by Paula on March 12, 2013* -
## stats

sample was obtained from a population with unknown parameters. scores: 6, 12, 0, 3, 4 compute the sample mean and sandard deviation. compute the estimated standard error for M.

*asked by T on March 27, 2011* -
## chemistry

A sample of neon effuses from a container in 73 seconds. The same amount of an unknown noble gas requires 149 seconds. Identify the gas.

*asked by nikki on October 16, 2008* -
## Honors Chemistry

I don't exactly understand this question -- can someone maybe explain it to me please? 6) Suppose you have an NaOH solution of unknown concentration. Name three possible substances that could be used in "known" solutions to titrate the NaOH solutions.

*asked by Emily on February 23, 2010* -
## Guiding young children

Older children process information _______ younger children. A. more slowly than B. at an unknown rate compared to C. at about the same rate as D. more quickly than My answer I think is D.

*asked by Diana on April 2, 2019* -
## math

a figure is made up of a big square and 4 smaller identical squares. The area of the whole figure is 980 square inches. What is the unknown length?

*asked by robin on May 21, 2018* -
## Chemistry

f 27.0 mL of Ca(OH)2 with an unknown concentration is neutralized by 32.40 mL of 0.185 M HCl, what is the concentration of the Ca(OH)2 solution? Show all of the work needed to solve this problem. Ca(OH)2 + 2 HCl 2 H2 O + CaCl2.

*asked by Johnny on June 13, 2011* -
## chemistry

In an experiment designed to determine the concentration of Cu+2 ions in an unknown solution, you need to prepare 100 mL of 0.10 M CuSO4 as your stock solution. How many grams of CuSO4(s) should you use?

*asked by Jessie on March 3, 2017* -
## algebra

How do I do this? You are building a corner cabinet, the walls intersect at a right angle. What is the perimeter of the cabinet if the height is 30 inches, the hypotneuse is 42 inches, and the base is unknown?

*asked by Tabby on December 6, 2007* -
## chemistry

I have a molar mass for a condensed vapor: 95.935 g/mol. What are a few of the potential identities of the unknown liquid from which the condensed vapor came from?

*asked by Hannah on April 1, 2010* -
## chemistry

A 0.115-L sample of an unknown HNO3 solution required 31.1 mL of 0.100 M Ba(OH)2 for complete neutralization. What was the concentration of the HNO3 solution?

*asked by Anonymous on July 7, 2012* -
## chemistry

The 17.35 g of NaCl sample was dissolv ed in an unknown amount of water. All we know is that prepared solution has 22.5% of NaCl . The mass of water is _____ g.

*asked by shawna on October 17, 2016* -
## Chemistry

A student completes titration by adding 12.0 mL of NaOH(aq) of an unknown concentration to 16.0 mL of 0.15M HCl(aq). what is the molar concentration of the NaOH(aq)?

*asked by Nina on June 7, 2012* -
## math

2x+3y=6 (solve for x) 2x+3y=6 Get unknown on one side and everything else on the other side. To do this we ned to move 3y. How to do that? Subtract 3y from both sides. 2x+3y-3y = 6-3y combine terms. 2x = 6-3y Now divide both sides by 2 2x/2 = (6-3y)/2

*asked by cheryl on March 17, 2007* -
## chemistry

a sample of unknown gas is found to have a volume of 479 mL at 27.0 degrees C and 1.30 atm. How may moles of gas are int eh sample?

*asked by Jazz on November 19, 2010* -
## chemistry

An unknown substance has a mass of 17.3 . When the substance absorbs 1.557×102 of heat, the temperature of the substance is raised from 25.0 to 45.0 . What is the most likely identity of the substance?

*asked by Kyle on September 20, 2010* -
## chemistry

An unknown sample with a molecular mass of 180.0g is analyzed to yield 40% C, 6.7% H, and 53.3% O. What is the empirical formula and the molecular formula of this compound?

*asked by z on June 20, 2012* -
## Chemistry

A 0.110-L sample of an unknown HNO3 solution required 52.1 mL of 0.150 M Ba(OH)2 for complete neutralization. What was the concentration of the HNO3 solution?

*asked by Lori on November 9, 2013* -
## chemistry

50.0 mL of an unknown HCl solution was titrated with 0.449 M NaOH. To reach the equivalence point, 38.4 mL of the NaOH was used. What was the concentration of the HCl?

*asked by james on March 25, 2015* -
## maths-urgently needed(probability)

A bag contains 5 red, 4 blue and an unknown number of m green balls. Two balls are drawn. If probability of both being green is 1/7 find m.

*asked by Anonymous on February 18, 2013* -
## chemistry

It requires 23.2 mL of 0.250 M KOH to titrate 49.0 mL of an HCl solution of unknown concentration. Calculate the initial HCl concentration.

*asked by amber on March 18, 2014* -
## Chemistry

It requires 17.9 mL of 0.120 M KOH to titrate 78.0 mL of an HCl solution of unknown concentration. Calculate the initial HCl concentration.

*asked by Kyle on February 27, 2012* -
## physics

A first object is thrown vertically upward with some initial speed and some initial height above the ground. Simultaneously, a second object is thrown straight down with the same initial speed and same initial height above the ground. Before the second

*asked by jake on August 24, 2010* -
## english please revise

In this study I will argue that prolonged exposure of social oppression and subjugation is the basis is for the African- American women limited participation in society’s political system. I will support my argument by providing a detailed analysis of

*asked by Christi on April 28, 2008* -
## Stat 214

Three identical chips, each with 0 on one side and 1 on the other, are to be tossed simultaneously. A. writes the sample space. B. what is the probability of observing the sum of the face-up numbers to equal to 2? C. What is the probability of observing

*asked by Erin on October 30, 2017* -
## Stat 214

Three identical chips, each with 0 on one side and 1 on the other, are to be tossed simultaneously. A. writes the sample space. B. what is the probability of observing the sum of the face-up numbers to equal to 2? C. What is the probability of observing

*asked by cee on June 30, 2014* -
## statistics

Table 1 Variables in the ZYX Case Study Variable Typical Value Level of Measurement (Attribute/Numeric) Position Title Ordinal Income < $25k Ratio Education Bachelors Ordinal Commute < 30 min Ratio Gender Male, Female Nominal Job Sat. 56 Ratio Stress 10

*asked by brandy on May 9, 2009* -
## Chemistry

In the case of a small amount of your unknown failed to dissolve in the t-butanol, would it effect the molar mass? = Does molarity increase as molar mass increases?

*asked by AhmadM on February 2, 2013* -
## math

the sex of to domain species is unknown but they each have a probability of X and -5 what does x equal and what is the domain species? Please someone help me don't give me the answer just please explain the process of this to me i have no clue where to

*asked by carry on on February 24, 2017* -
## Chemistry

A .500g unknown sample is titrated with 40mL of .187M KMno4 by the following reaction: 5Fe{2+} + MnO4{-1} + 8H{+1} -> 5Fe{3+} + Mn{2+} + 4H2O. What is the percentage of iron in the following sample

*asked by Julie on September 29, 2013* -
## physics

when the students place the unknown cart on the scale the scale reads the mass of 1.20 kg a)calculate the percent difference b) state the reason for the difference . explain

*asked by john on October 3, 2014* -
## gen. chemistry

an unknown solid substance weighs 121g. calculate the specific heat if 425.2 cal raise the temperature of the solid from 24.0 degrees C to 55.7 degrees C.

*asked by lila on February 20, 2013* -
## chemistry help asap please

You have been given a sample of unknown molarity. Calculate the molarity of a solution which has been prepared by dissolving 8.75 moles of sodium chloride in enough water to produce a solution of 6.22l.

*asked by David on January 9, 2017* -
## trig or geom

i have to use pythagorean theorem to find the leg-measure of x. in the formula, x would be a^2. the hypotenuse is 11 and "b" is unknown. there is also a cosine with a measure of .4 at the top-most angle.. what is x? i don't know how to use cosine with the

*asked by starlight18 on March 11, 2012* -
## CHEMISTRY

You have been given a sample of unknown molarity. Calculate the molarity of a solution which has been prepared by dissolving 8.75 moles of sodium chloride in enough water to produce a solution of 6.22l.

*asked by Jason on January 9, 2017* -
## trigonometry

We begin by setting t=sin 18 degrees we weill think of t an an "unknown" angle and solve to get the exact value. Use a double angle formula to show that cos 36 degrees=1-2t^2

*asked by Anonymous on November 12, 2012* -
## Chemistry

some ammonia gas is dissolved in water. The exact concentration of the solution is unknown and has to be determined. Describe an experiment that would determine the concentration of the aqueous ammonia.

*asked by Nelly02 on April 18, 2013* -
## physics

an unknown force pushes an automobile of mass 1700kg. The automobile is ground level and accelerates at a rate of 3 meters per second squared.what is the magnitude of the force?

*asked by tg on September 3, 2011* -
## Math

A curve has equation y= 2 + x - x^2. Find coordinates of 3 unknown points on the line. 1st point is at negative x, y value. 2nd point is at x=0 and y is positive. 3rd value is at y=o and x is positive.

*asked by TJ on December 9, 2012* -
## MATH

FIND THE SOLUTION FOR THE EQUATION. ASSUME THAT ALL ANGLES IN WHICH AN UNKNOWN APPEARS ARE ACUTE ANGLES. COT ALPHA=TAN( ALPHA +40DEGREES) HOW DO I SOLVE THIS?

*asked by HAYDEN4747 on August 31, 2011* -
## Chemistry

I am really having trouble answering this question, can someone help? A binary compound between an unknown element E and hydrogen contains 91.27% E and 8.73% H by mass. If the formula of the compound is E3H8, calculate the atomic mass of E.

*asked by Melissa on September 12, 2010* -
## Chemistry

In a titration experiment, 15.0 mL of 0.10 M Ba(OH)2 is required to titrate a 10.0 mL of an unknown solution of HNO3. Calculate the concentration of the HNO3 solution using the data. 2HNO3 + Ba(OH)2 ® Ba(NO3)2 + 2H2O

*asked by Kevin on April 18, 2018* -
## Chemistry

The student used the KHP in a subsequent titration experiment where he titrated 25.00 +/- 0.03 ml of the acid against an unknown solution of NaOH. The titration required 23.70 +/- 0.10 ml of the base. What is the concentration of NaOH?

*asked by Aaeisha on August 9, 2015* -
## chemistry

in making a solution of an unknown solid substance to test it for the presence of ions, would it matter if you used pure water or tap water to make the solution

*asked by lester on December 17, 2009* -
## physics

An unknown magnetic field produces a set of lines for a transition from a state with l = 3 to one with l = 2, between which there is a maximum energy difference of 6.1x10-4 eV. How many lines are there? What is the magnitude of the field?

*asked by alice on May 20, 2011* -
## Chemistry

A rectangular solid of unknown density is 6cm long, 3cm high, and 7cm wide. The mass of this solid is 250g. Calculate the density.

*asked by Shay on September 11, 2016* -
## 6th grade

A student heats 4.00 g of a blue compound, which reacts completely to produce 2.56 g of a white compound and an unknown amount of colorless gas. What is the mass of this gas?

*asked by Wyeth on October 6, 2010* -
## Physics

You are given two unknown point charges, Q1 and Q2. At a point on the line joining them, one-third of the way from Q 1 to Q2, the electric field is zero. Are Q1 and Q2 like or unlike charges? How many times greater is Q2 than on Q1? I am really confused on

*asked by Nat on February 22, 2007* -
## Science

A student heats 4.00 g of a blue compound, which reacts completely to produce 2.56 g of a white compound and an unknown amount of colorless gas. What is the mass of this gas?

*asked by Wyeth on October 6, 2010* -
## Computer Technology

Can you help me with this question that I have on my assignment? You want to create a wireless network in your home so that all of your computers can share the 2 Mb DSL connection to the Internet. You are at the store shopping for wireless Internet cards

*asked by Shannon on June 28, 2007* -
## AP Chem

In a typical synthesis reaction, 0.142 g of chlorine gas is reacted with an unkown elemnt X to form a compound with the formula XCl3. If the final product has a mass of 0.178 g, what is the atomic mass of the unknown element?

*asked by Anna on January 12, 2009* -
## Phsyics HELP!

A car accelerates uniformly from +10.0 m/s to +50.0 m/s over a distance of 225 m. How long did it take to go that distance? Show all your work, including the equation used, given and unknown quantities, and any algebra required. Make sure your answer has

*asked by Vivian on March 5, 2015* -
## Clinical Chemistry

I am not sure how to start this. You are given a 200% solution of a compound. You must dilute and construct a calibration curve to interpret concentration of compound in unknown samples. Show the steps needed to perform a two-fold serial dilution through 5

*asked by Ashley on November 2, 2014* -
## English (easy)

The following is my thesis for my essay: In “The Unknown Citizen,” it is evident that Auden was concerned with modern society and its new dangers, which included conformity, government control, and anonymity. How can I make my thesis into a short and

*asked by Kara on April 16, 2009* -
## chemistry

The laboratory technician accidentally mixed NaHCO3 with BaCl2*2H2O instead of KCl when preparing unknown mixtures for this experiment. How would this mistake affect the calculated percentage of NaHCO3 in the mixture? Justify your answer with an

*asked by Gary on October 13, 2011*