Thursday

April 24, 2014

April 24, 2014

Number of results: 878

**maths**

The magnitude of an earthquake with intensity I is measured using a seismograph. The intensity I is converted into the Richter scale number using the following formula R=log10I. An earthquake in Town A was measured 3 on the Richter scale, while the earthquake in Town B ...
*Wednesday, May 8, 2013 at 8:38pm by hemant*

**Math**

An earthquake was recorded which was 1584893 times more powerful than a reference level zero earthquake. What is the magnitude of this earthquake on the Richter scale? Intensity on the Richter scale is log(I/Io).
*Wednesday, December 4, 2013 at 7:37pm by DROSP*

**Math (PreCalculus)**

An earthquake was recorded which was 1584893 times more powerful than a reference level zero earthquake. What is the magnitude of this earthquake on the Richter scale? Intensity on the Richter scale is log(I/Io). Correct Answer is 6.268. But how to get that?
*Wednesday, December 4, 2013 at 8:39pm by DROSP*

**d**

Calculus help!!Suppose an earthquake is measured with a magnitude of 6 on the Richter scale with an error of at most 2%. Use differentials to find the error in the intensity of the earthquake
*Wednesday, November 7, 2012 at 5:24pm by Anonymous*

**science**

how does a magnitude-8.0 earthquake could be classified as a low-intensity earthquake? LAST SCIENCE QUESTION!
*Wednesday, April 1, 2009 at 5:44pm by Sara*

**Earth Science **

To measure the strength of an earthquake, you can use either a______scale or______scale. A)Richter B)seismograph C)mercalli intensity part:2 A)moment magnitude B)seismogram C)mercalli intensity
*Monday, December 7, 2009 at 11:21pm by george*

**physics**

The intensity of an earthquake wave is measured to be 6 x10 ^6 J ms at a distance of 50 km from its source. Calculate the intensity when it passed the point 4 km to source ? What is the rate energy passed through an area of 6 ms^2 at 4 kW?
*Sunday, November 30, 2008 at 9:18am by Sandhya*

**Physics**

The intensity of a particular earthquake wave is measured to be 5.0 multiplied by 106 J/m2·s at a distance of 55 km from the source. (a) What was the intensity when it passed a point only 3.0 km from the source? (b) What was the rate energy passed through an area of 7.0 m2 at ...
*Sunday, January 31, 2010 at 9:27pm by Eric*

**Physics**

The intensity of an earthquake wave passing through the Earth is measured to be 2.5×106 J/m^2 at a distance of 48 km from the source. What was its intensity when it passed a point only 2.0 km from the source? At what rate did energy pass through an area of 3.0 m^2 at 2.0 km?
*Thursday, December 2, 2010 at 10:07pm by Jake*

**Science**

The intensity of an earthquake wave passing through the Earth is measured to be 1.5×10^6 J/m^2*s at a distance of 58km from the source. What was its intensity when it passed a point only 2.0 km from the source? At what rate did energy pass through an area of 3.0 m^2 at 2.0 km ?
*Friday, January 25, 2013 at 1:16pm by Chris*

**college physics**

The intensity of an earthquake wave passing through the Earth is measured to be 2.5×10^6 J/m^2 at a distance of 43 km from the source. What was its intensity when it passed a point only 2.0 km from the source? AND At what rate did energy pass through an area of 4.0 m^2 at 2.0 ...
*Tuesday, April 27, 2010 at 10:33am by Anonymous*

**science **

To locate the epicenter of an earthquake a seismologists must determine all of the following except ? a) the difference between arrival time of P and S waves b) seismographic locations data from the seismograph locations c) the distance from the epicenter to at least three ...
*Tuesday, February 18, 2014 at 7:50am by victoria *

**science**

explain how an magnitude of 8.0 earthquake could be classified as a low intensity
*Sunday, February 13, 2011 at 8:40pm by Anonymous*

**math**

An earthquake has a magnitude of 6.7 on the Richter Scale.Find the intensity.
*Saturday, December 3, 2011 at 5:22pm by Earthquakes*

**Alegbra**

11. What, to the nearest tenth, will an earthquake measure on the Richter scale if it has an intensity of I = 43, 512,000 I 0?
*Sunday, August 1, 2010 at 9:45am by Jessica*

**earth science...help**

for this question: Put the folloing words together in a few sentence to explain their meaning and relationship to one another: seismic waves, seismograms, seismoghaps, and seismologists. is this answer suitable: Seismic wave is an elastic shock wave that travels through the ...
*Tuesday, January 13, 2009 at 10:05pm by Anonymous*

**scientist**

In 1976 a powerful earthquake hit the city of Tangshan, China. Scientists had failed to predict the earthquake. If people had paid attention to the unusual animal behavior that preceded the earthquake, however, they would have known it was coming. Animals can often sense an ...
*Friday, September 4, 2009 at 9:49pm by Anonymous*

**math30**

The 1933 earthquake in Japan registered 8.9 on the Richter scale. a.The 1985 earthquake in Peru registered 7.7 on the Richter scale. How many more times intense was the earthquake in Japan? Round your answer to one decimal place. b. What would the Richter scale reading be of ...
*Wednesday, July 11, 2012 at 12:48pm by alejandro*

**math**

What is the magnitude on the Richter Scale of an earthquake measuring 3.7 x 10^5 i(sub 0)? How many times more intense is a Richter 5 earthquake than a Richter 2.5 earthquake?
*Saturday, November 12, 2011 at 10:04pm by Nabil*

**Word problem 2**

The 1985 Mexico city earthquake had a magnitude of 8.1 on the Richter scale. The 1976 earthquake in Tangshan, China was 1.26 times and intense. What was the magnitude of the Tangshan earthquake. Thanks
*Wednesday, February 14, 2007 at 9:42am by Jen*

**Logarithms **

1.) A fossil is burned and the CO2 produced is captured. It produces 453 counts of radiation per gram. Under the same conditions atmospheric CO2 produces 19 277 counts. Calculate the age of the fossil. I have the formula: Nt = N0 e^ -t(ln2)/T Nt is the number of atoms of ...
*Tuesday, September 4, 2012 at 10:24pm by Amy*

**Precalc**

Can someone please help me? I don't know how to solve for time under 23 units. When I try I think I get the answer for above 23 units and when I try to subtract from the whole period my answer is wrong. The correct answer is 5.1337 hours. Fidel is measuring the light intensity...
*Friday, August 19, 2011 at 2:22am by Rose*

**Science**

Which scale measures the amount of damage after an earthquake? Richter scale Mercalli intensity scale moment magnitude scale seismograph scale
*Monday, December 7, 2009 at 5:13pm by george*

**math**

the seismic waves of a magnitude 6 earthquake are 10 squared times as great as a magnitude 4 earthquake. The seismic waves of a magnitude 4 earthquake are 10 times as great as a magnitude 3 earthquake. How many times as great are the seismic waves of a magnitude 6 earthquake ...
*Sunday, February 9, 2014 at 8:49pm by nicey*

**Pre-Calculus**

The Richtr scale was evied y Cahrles F.Richter a American geologist. The scale is based on the equation M(x)=logx/x0(little 0), where x is the seismographic reading of the earthquake and x0 i 1 miron 0.001mm (the seismographic reading of a zero-level earthuquake) a) Determine ...
*Monday, December 21, 2009 at 1:55am by Andy*

**physics**

A bell is rung at a sound intensity of 70dB . A trumpet is blown at an intensity that is greater by a factor of 10^3. What is the intensity level of the trumpet
*Sunday, May 20, 2012 at 9:42pm by Melissa*

**science**

A _____________________ is an earthquake that occurs after a large earthquake in the same area
*Thursday, February 28, 2008 at 6:29pm by Julia*

**Science**

If a tsunami develops during an underwater earthquake, what will most likely occur? a. deep-ocean sediments will travel great distances. b. no destruction will occur near the origin of the earthquake. c. the magnitude of the earthquake will determine the direction of the ...
*Tuesday, March 17, 2009 at 8:29pm by Angie*

**math**

A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 4.9 * 10^2 µm. Find this earthquake's magnitude.
*Monday, November 11, 2013 at 11:12pm by lisa*

**math**

A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 4.9 * 10^2 µm. Find this earthquake's magnitude.
*Tuesday, November 12, 2013 at 1:02am by Anonymous*

**Science**

I need to find info. about earthquakes, such as what causes them..what are the consequences of earthquake..definition of earthquake...etc. Thank you
*Friday, May 30, 2008 at 9:33pm by Amanda*

**MATH**

A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 4.3 102µm. Find this earthquake's magnitude.
*Friday, February 8, 2013 at 1:04pm by TONYA*

**Math - Working with Logs!!**

On September 26 2001, an earthquake in North Bay measured 5.0 on the Ritcher scale. What is the magnitude of an earthquake 3 times as intense as North Bay's earthquake? I would post my answer, but in text, it's just confusing and I can't post picture links to show my work... ...
*Tuesday, December 11, 2007 at 10:30pm by Anonymous*

**algebra**

A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 5.9 102 µm. Find this earthquake's magnitude on the Richter scale.
*Thursday, September 1, 2011 at 2:32pm by Sharon*

**Math**

A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 5.8 x10^2 µm. Find this earthquake's magnitude on the Richter scale.
*Saturday, October 29, 2011 at 7:42pm by Angel *

**algebra**

A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 5.2 102 µm. Find this earthquake's magnitude on the Richter scale.
*Sunday, October 30, 2011 at 4:34am by suzie*

**Earthquakes**

What determines the magnitude of an earthquake? I know that two plates slide against one another and that creates friction and the potential energy turns into kinetic energy in the form of an earthquake. But how is the magnitude determined? Im thinking the longing the 2 plates...
*Tuesday, September 28, 2010 at 12:45am by Lena*

**math**

A seismograph 300km from the epicenter of an earthquake recorded a maximum amplitude of 5.8*10^2lrm, find this earthquake's magnitude on the RicHTER scale to the nearest tenth.
*Monday, March 12, 2012 at 2:19pm by sue*

**Applied maths**

2. When light passes through a transparent medium, its intensity I at a depth d can be modelled using the equation where I0 is the initial intensity, and k is a constant. If the intensity of sunlight is reduced to 54% of its original value after penetrating through a depth of...
*Wednesday, February 13, 2013 at 7:09pm by DAVID*

**Physics(Please help)**

The intensity (in W/m2) of one sound is 4.83 times as great as the intensity of another sound. Relative to the quieter sound, what is the intensity level â of the louder sound? I am not sure how to start this. Thank you.
*Thursday, June 21, 2012 at 6:47pm by Hannah*

**algebra**

A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 5.7 102 µm. Find this earthquake's magnitude on the Richter scale. (Round your answer to the nearest tenth.)
*Sunday, December 18, 2011 at 8:02pm by suzan*

**math**

A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 5.2 102 µm. Find this earthquake's magnitude on the Richter scale. (Round your answer to the nearest tenth.) M =
*Monday, January 23, 2012 at 1:18pm by kiki*

**Algebra**

A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 5.7 102 µm. Find this earthquake's magnitude on the Richter scale. (Round your answer to the nearest tenth.)
*Friday, July 20, 2012 at 9:35am by Paul*

**Algebra**

A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 5.5 102 µm. Find this earthquake's magnitude on the Richter scale. (Round your answer to the nearest tenth.)
*Saturday, November 3, 2012 at 8:10pm by Renee Tyler*

**MATH**

A semiograph 300km from the epicenter of an earthquake recorded a maxximum amplitude of 5.3x10^2 um. Find this earthquake's magnitude on the Richter scale. (Round your answer to the nearest tenth)
*Sunday, November 4, 2012 at 3:54pm by TEDDY *

**math**

after passing therough a material t centimeters thick, the intensity I(t) of a light beam is given by I(t) =(4^-ct)Io, where Io is the initial intensity and c is a constant called the absorption factor. Ocean water absorbs light with an absorption factor of c= .0101. at what ...
*Friday, February 24, 2012 at 5:47pm by Suzie*

**English**

In 1976 a powerful earthquake hit the city of Tangshan, China. Scientists had failed to predict the earthquake. If people had paid attention to the unusual animal behavior that preceded the earthquake, however, they would have known it was coming. Animals can often sense an ...
*Thursday, May 7, 2009 at 1:02pm by john browm*

**math**

A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 5.8 multiplied by 102 µm. Find this earthquake's magnitude on the Richter scale. (Round your answer to the nearest tenth.) M =
*Thursday, October 20, 2011 at 2:29pm by Anonymous*

**DeVry University**

A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 5.9 102 µm. Find this earthquake's magnitude on the Richter scale. (Round your answer to the nearest tenth.)
*Friday, January 20, 2012 at 12:07am by Sandra Beasley*

**ALGEBRA**

A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 5.4 multiplied by 102 µm. Find this earthquake's magnitude on the Richter scale. (Round your answer to the nearest tenth.)
*Monday, April 16, 2012 at 10:36am by Randy*

**College Math**

A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 5.3 102 µm. Find this earthquake's magnitude on the Richter scale. (Round your answer to the nearest tenth.)
*Monday, April 16, 2012 at 2:16pm by Yvonne*

**ALGEBRA**

A seismograph 300 km from the epicenter of an earthquake recorded a maximum amplitude of 5.5 multiplied by 102 µm. Find this earthquake's magnitude on the Richter scale. (Round your answer to the nearest tenth.) M =
*Wednesday, April 25, 2012 at 8:44pm by Randy*

**english : CT**

In 1976 a powerful earthquake hit the city of Tangshan, China. Scientists had failed to predict the earthquake. If people had paid attention to the unusual animal behavior that preceded the earthquake, however, they would have known it was coming. Animals can often sense an ...
*Wednesday, March 19, 2008 at 10:50pm by rose*

**critical thinking**

In 1976 a powerful earthquake hit the city of Tangshan, China. Scientists had failed to predict the earthquake. If people had paid attention to the unusual animal behavior that preceded the earthquake, however, they would have known it was coming. Animals can often sense an ...
*Sunday, April 13, 2008 at 7:07pm by Matt*

**critical thinking**

In 1976 a powerful earthquake hit the city of Tangshan, China. Scientists had failed to predict the earthquake. If people had paid attention to the unusual animal behavior that preceded the earthquake, however, they would have known it was coming. Animals can often sense an ...
*Thursday, September 11, 2008 at 9:46pm by d*

**critical thinking**

In 1976 a powerful earthquake hit the city of Tangshan, China. Scientists had failed to predict the earthquake. If people had paid attention to the unusual animal behavior that preceded the earthquake, however, they would have known it was coming. Animals can often sense an ...
*Thursday, January 22, 2009 at 4:19pm by bibi*

**math**

If it has been determined that the probability of an earthquake occurring on a certain day in a certain area is 0.05, what are the odds against an earthquake
*Thursday, October 8, 2009 at 3:53pm by jessica*

**Critical Thinking**

In 1976 a powerful earthquake hit the city of Tangshan, China. Scientists had failed to predict the earthquake. If people had paid attention to the unusual animal behavior that preceded the earthquake, however, they would have known it was coming. Animals can often sense an ...
*Saturday, June 6, 2009 at 12:39pm by mary*

**math**

If it has been determined that the probability of an earthquake occurring on a certain day in a certain area is 0.05, what are the odds against an earthquake? multiple choice A) 20 : 1 B) 1 : 20 C) 18 : 1 D) 19 : 1 3
*Sunday, October 11, 2009 at 2:24pm by ann*

**Logarithmic Scales**

In 1995, Japan had an earthquake of magnitude 7.2. What is the magnitude of an earthquake that is twice as intense?
*Wednesday, March 28, 2012 at 11:26pm by Anonymous*

**earth sceince**

Which of the following statements is TRUE? S-waves are able to pass through the Earth's core. Continental-continental plate convergence is reponsible for the creation of mountain ranges. Oceanic crust is on average about 60 - 100 km thick. The Richter Scale measures earthquake...
*Friday, October 10, 2008 at 1:20pm by Deborah*

**Animal Farm (civics)**

True o False Both times that the windmill was destroyed was actually because of an earthquake. i known 1 time was caused by an earthquake by i forgot the other time
*Wednesday, October 30, 2013 at 4:37pm by Anonymous *

**algebra**

find 10-7 divided by 10-7 to determine how much more intense earthquake A was than earthquake B 10-7 DIVIDED BY 10-3
*Wednesday, January 5, 2011 at 1:09pm by ron*

**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...
*Monday, October 24, 2011 at 8:18am by fiko*

**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...
*Monday, October 24, 2011 at 6:09pm by maria*

**Algebra 2**

PLEASE HELP-DUE APRIL 5TH, 2011!!!! EARTHQUAKES an earthquake rated at 3.5 on the Richter scale is felt by many people, and an earthquake rated at 4.5 may cause local damage. The Richter scale magnitude reading m is given by m = log (base 10) x, where x represents the ...
*Sunday, March 27, 2011 at 2:46pm by Lindsey*

**Physics-just oen more time, please**

The sound intensity at a certain distance from a car is 2*10^-7 W/m^2. - If the distance is tripled, what is the new intensity of the sounds? - if the distance is halved, what is the new intensity of the sound? for the first question I tried doing I2/2E^-7=3 since I'm assuming...
*Tuesday, October 21, 2008 at 9:56pm by Ziyi*

**physics - sound level**

The source of a sound wave has a power of 2.50 µW. Assume it is a point source. (a) What is the intensity 6.70 m away? I used I = Power / 4*pi*r^2 and found I to be 4.43x10^-9 W/m^2 (b) What is the sound level at that distance? Sound level = 10 dB*log [(Intensity)/(Intensity ...
*Saturday, April 21, 2007 at 12:54am by COFFEE*

**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...
*Monday, October 24, 2011 at 9:28am by maria*

**physics**

A sound wave with intensity 37 mW/m2 interferes constructively with a sound wave that has an intensity of 18 mW/m2. What is the intensity of the superposition of the two?
*Tuesday, April 10, 2012 at 11:03pm by opp*

**Math**

At a concert, the loudness of sound, L, in decibels, is given by the equation L=10log(I/I_o), where I is the intensity, in watts per square metre, and I_o, is the minimum intensity of sound audible to the average person, or 1.0 x 10^-12 W/m^2. a) The sound intensity at a ...
*Wednesday, May 20, 2009 at 3:04pm by Jus*

**Math**

At a concert, the loudness of sound, L, in decibels, is given by the equation L=10log(I/I_o), where I is the intensity, in watts per square metre, and I_o, is the minimum intensity of sound audible to the average person, or 1.0 x 10^-12 W/m^2. a) The sound intensity at a ...
*Wednesday, May 20, 2009 at 5:29pm by Jus*

**physics**

The angle between the polarizer transmission axis and the plane of polarization of the incoming light is 30 +/- 2 deg. If the incident light intensity Io is 100 W/cm2 what would be the intensity I after the light is transmitted through the polarizer? What would be the percent ...
*Friday, January 27, 2012 at 10:13pm by Melissa*

**Physics**

1. What is the intensity of a sound at the pain level of 120 dB? 2. What is the intensity level of a sound whose intensity is 2.0 x 10^-6 W/m^2?
*Saturday, May 29, 2010 at 11:14am by Amber*

**Physics**

This time I have two questions: #1.A recording engineer works in a soundproofed room that is 49.7 dB quieter than the outside. If the sound intensity in the room is 2.66 x 10-10 W/m2, what is the intensity outside? #2.A listener increases his distance from a sound source by a ...
*Tuesday, December 5, 2006 at 9:46pm by Jena*

**physics**

A faint sound with an intensity of 10 -9 W/m2 is measured by an intensity-level meter. What will the reading be in dB?
*Sunday, May 26, 2013 at 9:03pm by jeremy*

**physics**

What sound intensity level in dB is produced by earphones that create an intensity of 4.00¡¿10^-2 W/m^2?
*Tuesday, November 27, 2012 at 3:43pm by Jason*

**Math **

Find the decibel intensity level at a rock concert if the intensity was measured at 3.98x10^-3
*Thursday, January 24, 2013 at 7:44pm by Mike *

**math-algebra**

How do i solve these problems: 1. 2(-5y^3)^2+(-3y^3)^3 2. Lemon juice is 10^2 times as acidic as tomato juice. Tomato juice is 10^3 times as acidic as egg whites. How many times as acidic is lemon juice as egg whites? Write as a monomial. 3. The seismic waves of a magnitude 6 ...
*Tuesday, February 5, 2008 at 10:14pm by Jaylin*

**Math**

Formula given: The decibel (dB) scale for measuring loudness, d, is given by the formula d = 10 log base ten(I X 12 to the power of 12) where I is the intensity of sound in watts per square metre. a) Find the number of decibels of sound produced by a jet engine at a distance ...
*Sunday, February 16, 2014 at 5:25pm by Donna*

**Physics**

A 100 watt bulb emits light in all directions. The distance R from the bulb is equal to 1.0 meter. Complete the table below with calculated values of intensity of the bulb. Distance from Source Intensity (W/m2) R ? 2R ? 3R ? c) If the bulb was replaced by a 75 watt bulb, at ...
*Tuesday, March 5, 2013 at 10:25pm by Alex*

**physics**

What is the sound intensity level in decibels of ultrasound of intensity 10^5 W/m2, used to pulverize tissue during surgery
*Tuesday, November 27, 2012 at 3:44pm by Jason*

**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...
*Monday, October 24, 2011 at 4:44pm by maria*

**physics**

what is the sound intensity level in decibels of ultrasound of intensity of 105 w/m2, used to pulverize tissue during surgery
*Wednesday, September 18, 2013 at 1:28pm by Anonymous*

**alg**

Sound intensity (loudness) varies inversely as the square of the distance from the source. If a rock band has a sound intensity of 100 decibels 25 feet away from the amplifier, find the sound intensity 50 feet away from the amplifier.
*Friday, April 4, 2014 at 4:35pm by f*

**health**

Which type of exercise increases fat loss? A. High-intensity B. High-duration C. High-duration/low-intensity D. High-intensity/low-duration im stuk on this question and i can't get any information about it inside my head.weird can any one explain to me simple words please
*Tuesday, September 16, 2008 at 4:59am by AK*

**Science**

I'm currently studying for a science test and I need help on one of the question. - What is a tsunami and how is it related to an earthquake? For the part " What is a tsunami, my answer would be Tsunamis are giant waves caused by earthquakes or volcanic eruptions under the sea...
*Thursday, June 2, 2011 at 12:11am by Shadow*

**science i need help**

what is the realtionship between the focus and the epicenter? the focus is the depth of an earthquake, the epicenter is the center of the earthquake.
*Sunday, October 15, 2006 at 11:01pm by alejandra*

**7th grade science **

What could increase the damage to human built structures during an earthquake? A-buildings far away from the pint of origin of the earthquake B- loose material in underlying land C- solid rock beneath buildings D-flexible buildings is it C???
*Friday, January 11, 2013 at 5:36pm by Aisha *

**Physics**

At a distance of 30 m the noise from the engine of an jet has an intensity of 130 dB. At this level, you will be in pain and your ears will hurt. That's why this intensity is know as the "pain threshold". How far do you have to be from a jet (total distance), in order for the ...
*Friday, January 22, 2010 at 12:53am by Intensity*

**physics**

1.) The average sound intensity inside a busy neighborhood restaurant is 3.*10^-5 W/M^2. How much energy goes into each ear (area = 2.1 * 10^-2 m^2) during a one hour meal? 2.) A member of an aircraft maintenance crew wears protective earplugs that reduce the sound intensity ...
*Sunday, December 12, 2010 at 11:23pm by David*

**Richter scale question**

An earthquake registers 6.1 on the richter scale. What is the rating on an earthquake twice as powerful? I know: M=I/Io Then what do you do?
*Monday, November 1, 2010 at 10:43am by Ali*

**Physics**

The intensity due to a number of indipendent sound sources is the sum of the individual intensities. A) When four quadruplets cry simultaneously, how many decibels greater is the sound intensity level than when a single one cries? B) To increase the sound intensity level again...
*Saturday, March 29, 2008 at 5:25pm by Amanda*

**math**

A loud speaker at a rock concert generates 102 W/m2 at 20m with a frequency of 1 kHz. Assume that the speaker spreads its intensity uniformly in all direction. (a) What is the sound level ( = ?) at 20 m? (b) What is the total acoustic power output of the ...
*Tuesday, November 9, 2010 at 1:37pm by nizar*

**Advanced Functions - Grade 12**

Radiation from the sun keeps us alive, but with the thinning of the ozone layer, it is important to limit exposure. Most of us know that the sun is far more intense at the equator than at the poles. The relationship between the intensity of radiation with respect to the ...
*Tuesday, July 20, 2010 at 12:22am by Nish*

**physical**

At a distance of 30 m the noise from the engine of an jet has an intensity level of 130 dB. At this level, you will be in pain and your ears will hurt. That's why this intensity is know as the "pain threshold". How far do you have to be from a jet (total distance in meters), ...
*Sunday, January 23, 2011 at 7:46pm by Anon*

**physics**

At a distance of 30 m the noise from the engine of an jet has an intensity level of 130 dB. At this level, you will be in pain and your ears will hurt. That's why this intensity is know as the "pain threshold". How far do you have to be from a jet (total distance in meters), ...
*Sunday, January 23, 2011 at 10:47pm by Anon*

**Earth Science**

How much more energy is released in a 5.0 magnitude earthquake than a 4.0 magnitude earthquake? I know that a tenfold increase in wave amplitude equals an increase of 1 on the scale so 1 to 2 = 10times so does that mean that 2 to 3 would be 10 more times?
*Sunday, February 28, 2010 at 2:19pm by Janet*

**Earth Science(Please help)**

How much more energy is released in a 5.0 magnitude earthquake than a 4.0 magnitude earthquake? I know that a tenfold increase in wave amplitude equals an increase of 1 on the scale so 1 to 2 = 10times so does that mean that 2 to 3 would be 10 more times?
*Sunday, February 28, 2010 at 3:17pm by Janet*

**college algebra**

Use a calculator to help solve the problem. The intensity I of light (in lumens) at a distance x meters below the surface is given by I = I0 k x, where I0 is the intensity at the surface and k depends on the clarity of the water. At one location in the Atlantic ...
*Monday, November 4, 2013 at 4:13pm by Dee*

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