Tuesday

April 21, 2015

April 21, 2015

Number of results: 50,140

**Physics**

In a "Rotor-ride" at a carnival, people are rotated in a cylindrically walled "room." (See Fig. 5-35.) The room radius is 4.6 m, and the rotation frequency is 0.7 revolutions per second when the floor drops out. What is the minimum coefficient of static friction so that the ...
*October 4, 2009 by Jennifer *

**physics**

In a "Rotor-ride" at a carnival, people are rotated in a cylindrically walled "room." (See Fig. 5-35.) The room radius is 5.4 m, and the rotation frequency is 0.8 revolutions per second when the floor drops out. What is the minimum coefficient of static friction so the people ...
*October 31, 2010 by Joe*

**Physics**

In a "Rotor-ride" at a carnival, people are rotated in a cylindrically walled "room." The radius of the room is 5.5 m, The coefficient of static friction is μ=0.1. What is the minimum rotation frequency such that the people will not slide down the wall when the floor ...
*October 10, 2011 by Alex*

**Physics**

In a "Rotor-ride" at a carnival, people are rotated in a cylindrically walled "room." The radius of the room is 4.0 m, The coefficient of static friction is μ=0.13. What is the minimum rotation frequency such that the people will not slide down the wall when the floor ...
*March 1, 2013 by Derrick*

**Physics**

Please Help I have no idea how to approach this problem In a "Rotor-ride" at a carnival, people rotate in a vertical cylindrically walled "room." If the room radius was 5.7m , and the rotation frequency 0.35 revolutions per second when the floor drops out, what minimum ...
*May 31, 2014 by Diana*

**HELP**

In a "Rotor-ride" at a carnival, people pay money to be rotated in a vertical cylindrically walled "room." If the room radius is 4.8 m, and the rotation frequency is 0.6 revolutions per second when the floor drops out, what is the minimum coefficient of static friction so that...
*October 9, 2006 by Britt Pogue*

**computers**

. Explain the following unexpected result: $ whereis date date: /bin/date ... $ echo $PATH .:/usr/local/bin:/usr/bin:/bin $ cat > date echo "This is my own version of date." $ ./date Fri May 22 11:45:49 PDT 2009
*July 19, 2011 by ivy*

**Algebra**

If a worker wants to pack 200 newly harvested mangoes at average size of 3"x2" in delivery boxes .To optimize the cost and profit in packaging , the mangoes must be properly packed in boxes of similar sizes. To systemize counting , there must also be equal ...
*August 17, 2014 by Claudette*

**MAth**

If a worker wants to pack 200 newly harvested mangoes at average size of 3"x2" in delivery boxes .To optimize the cost and profit in packaging , the mangoes must be properly packed in boxes of similar sizes. To systemize counting , there must also be equal ...
*August 17, 2014 by Claudette*

**Math**

If a worker wants to pack 200 newly harvested mangoes at average size of 3"x2" in delivery boxes .To optimize the cost and profit in packaging , the mangoes must be properly packed in boxes of similar sizes. To systemize counting , there must also be equal ...
*August 17, 2014 by Claudette*

**Geodetic Survey**

a surveyor is trying to determine the change in hight h from the bottom to the top of a hill. If the height of instrument H is 4.5 ft the height of the object that he sights on the tower A is 6.5 ft and the zenith angle Z is 54deg 16' 25" determine the height of H (...
*September 14, 2012 by Teresa*

**Physics**

An amusement park ride called the Rotor consists of a room in the shape of a vertical cylinder (2.10 m in radius) which, once the riders are inside, begins to rotate, forcing them to the wall. When the room reaches a speed of one rotation every 1.36 s, the floor suddenly drops...
*October 23, 2011 by Kellie*

**Physics**

A popular carnival ride consists of a large, round room that rotates fast enough that any person standing against the wall will be stuck there, even as the floor is dropped away from their feet. The coefficient of static friction between the person and the wall is μs , ...
*July 26, 2012 by Zac*

**Physics**

“Rotor” is a ride found in many amusement parks that consists of a hollow cylindrical room (roughly 8 ft in radius) that rotates around a central vertical axis. Riders enter the room and stand against the canvas-covered wall. The room begins to rotate, and when a certain ...
*January 16, 2012 by TAG*

**physics**

a carnival ride is made so that at a certain point the floor can be lowered and the people inside dont fall. if this carnival ride has 2.0 m radius and rotates 1.1 times per second: a) find the speed of the ride. B) find the centripetal acceleration of a rider C) what produces...
*April 6, 2012 by Ren*

**statistic**

Let's assume there are 3 people in Room A and another 3 people in Room B. The ages of the people in Room A are 25, 25, and 25. The ages of the people in Room B are: 10, 25, and 40. The mean of the ages in both rooms is 25. Does that mean that both room have populations that ...
*May 12, 2010 by carol*

**physics**

A small motor is mounted on the axis of a space probe with its rotor (the rotating part of the motor) parallel to the axis of the probe. Its function is to control the rotational position of the probe about the axis. The moment of inertia of the probe is 6000 times that of the...
*November 13, 2010 by Miki*

**phy**

A centrifuge rotor rotating at 13,000 rpm is shut off and is eventually brought uniformly to rest by a frictional torque of 1.30 mN. If the mass of the rotor is 4.80 kg and it can be approximated as a solid cylinder of radius 0.0710 m, through how many revolutions will the ...
*October 16, 2010 by mas*

**Physics**

Spin and Barf Ride Rotor diameter is 4.0 m. Minimum period of rotation is 1.7 s. The ride lasts 110 s. 1. What is the tangential velocity? 2. What is the centripetal acceleration is m/s2 and gs?
*January 19, 2011 by John*

**Physics**

A centrifuge rotor rotating at 11500 is shut off and is eventually brought uniformly to rest by a frictional torque of 1.52 . a.If the mass of the rotor is 6.07 and it can be approximated as a solid cylinder of radius 0.0750 , through how many revolutions will the rotor turn ...
*November 27, 2012 by Melissa*

**Physics**

A centrifuge rotor rotating at 10700 rpm is shut off and is eventually brought uniformly to rest by a frictional torque of 2.48 m * N. 1. If the mass of the rotor is 5.61 kg and it can be approximated as a solid cylinder of radius 0.0820 m, through how many revolutions will ...
*November 22, 2010 by Nick*

**physics**

A centrifuge rotor rotating at 7,000 rpm is shut off and is eventually brought uniformly to rest by a frictional torque of 1.30 mN. If the mass of the rotor is 4.80 kg and it can be approximated as a solid cylinder of radius 0.0710 m, through how many revolutions will the ...
*November 10, 2009 by jennifer*

**physics**

Suppose a person is going to be exposed to a steady tone of frequency 8000 Hz all night (perhaps arising from noisy electronics in a nearby room. ) If this person wants their perceived room loudness level to be a very quiet 10 phon (in order to sleep easily), what is the ...
*March 10, 2011 by dreadantlers*

**Dynamics**

The rotor is an amusement park ride where a person enters the Rotor when it is stationary and stands against the wall with their back against the wall. The rotor then begins to spin around a vertical axis. After reaching cruising speed, the floor drops away and the patron is ...
*September 28, 2012 by Connor*

**math**

each table in a banquet room seats 8 people. The room can seat no more than 360 people. Write and solve an inequality to represent the number of tables in the banquet room
*January 18, 2013 by kelsionna*

**Physics**

A cylindrical carnival ride is spinning with a frequency of 0.5 Hz in a circle of radius 3 m which allows a 60 kg person to “stick” to the side of the ride as it spins. T = 2s v = 9.42 m/s A) Find the normal force exerted on the person. B) What minimum s is ...
*November 27, 2012 by Sierra*

**12**

The Green Mountain Inn can rent all its 210 rooms when it charges $45 per night for a room, but the manager wants to increase profits. He finds, however, that for each $2 increase in the room rate, 3 fewer rooms are rented. If the cost of cleaning an occupied room is $5 per ...
*November 3, 2009 by Ak *

**statistics**

If 20% of the people in a community use the emergency room at a hospital in one year, find the probabilities for a sample of 10 people, a.At the most three use the emergency room. b.Exactly three use the emergency room c.At least five use the emergency room.
*December 13, 2011 by Joe*

**maths**

A cuboidal room is 1 and 1/2 as long again as it is broad. The cost of carpeting the room at the rate of Rs.5 per m sq is Rs.480 and the cost of papering the walls with coloured paper at the rate of Rs.3 per m sq is Rs.360. Find the dimensions of the room .
*January 26, 2013 by Anonymous*

**Physics-Please help with formula**

If you were in a rotor style ride and the riders accelerate until the speed of ride is reached- if the radius of the cylinder is 5.0m and the coefficient of friction between clothes and wall is 0.5, how do you find minimum speed you would need to stick to the wall of the ride...
*December 7, 2010 by Joey*

**College Physics**

The rotor is an amusement park ride where people stand against the inside of a cylinder. Once the cylinder is spinning fast enough, the floor drops out. A-What force keeps the people from falling out the bottowm of the ride? I think that it's the Normal force? B-If the ...
*October 21, 2008 by JP*

**Math**

It is recommended that there be at least 7 square feet of work space for every person in a conference room. A certain conference room is 13' by 16'. Find the maximum number of people the room can accommodate.
*September 8, 2012 by Cashawn*

**PreCalculus **

I need help with a Matrix Algebra problem A small school has 100 students who occupy three classrooms A, B, and C. After the first period of the school day, half the students in room A move to room B, one-fifth of the students in room B move to room C, and one-third of the ...
*December 13, 2011 by Lana*

**Physics**

A bike wheel rotates uniformly through 2 revolutions in 3 seconds. a) what is the period of the wheel's rotation? T=3rev/2s=1.5s b) what is the frequency of the wheel's rotation? (in Hertz) f=1/T =1/1.5 =.666Hz c) what is the angular speed of the wheel(provide answer in ...
*October 31, 2007 by Tammy*

**Fher**

a laundry room is shaped like a rectangle. the area of the room is 6 square yards. the perimeter is 10 yards. The room is longer than it is wide. How wide is the room? How long it the room?
*March 30, 2011 by Anonymous*

**English**

Could anyone suggest a food that could go in Room 101. Room 101 is a room where you put all the foods you hate. I have been assigned to write a persuasive text on why i want this food to be put in room 101 and why. Kindly suggest a food that people generally like but it's ...
*October 26, 2011 by Ruth*

**physics**

A student puts on a Dresden Dolls disc in her cd player which spins at 1800 revolutions per minute. A compact disc has a mass of about 0.016 kg and a radius of 6.0 cm. a) What is the period of rotation in seconds? b) What is the frequency of the rotating disc? d) What is the ...
*January 4, 2013 by al*

**maths**

95. Suppose that 387 people will travel on a space shuttle with room for 420 people.Each compartment seats 14 people before the next compartment opens.How many people will ride in the last compartment that opened?
*October 9, 2014 by thomas*

**math for elementary teachers**

Suppose that carpeting cost $12.36 per square yard at a carpet store. what will be the cost to carpet a conference room if the rooms dimensions are 110 ft by 42 ft. (the conference room should seat 380 people using 6' diameter tables each seating 10 people.)
*March 19, 2012 by brittney*

**Alebgra**

The lenth of a room is 3 more thean twice the width of the room. The perimeter of the room is 66 feet. What are the dimensions of the room? (Let x=the width fo the room.) Book gives the following for the answer: x + x =(3 + 2x) + (3 + 2x)=66 width=10, lenth=23 I am not clear ...
*February 4, 2008 by G*

**physics**

A carnival ride has a radius of 2.18 m and rotates once every 0.82 sec. What would the speed of a rider be that has been flung from the ride? What would be the angular speed of a second rider who remains on the ride?
*March 3, 2013 by kadie*

**Single Room, Earth View by Sally Ride--Help!**

This regards the story "Single Room, Earth View" by Sally Ride. Choose one of the following quotations; then in a few paragraphs, discuss how Sally Ride's observations support or refute the quotation. Quotations: 1. "Observation is a passive science, experimentation is an ...
*April 7, 2014 by Victoria*

**physics**

An amusement park ride consists of a large vertical cylinder that spins about Figure P6.61 its axis fast enough such that any person inside is held up against the wall persons who walk around on the inner wall of the outer rim. Find the rate of rotation of the wheel (in ...
*October 1, 2011 by Anonymous*

**algebra**

Martha is having carpet installed in a rectangular room.She estimates the measurements of the room to be 13 ft by 19 ft. The actual measurements of the room are 12 ft by 18 ft. Which expression represents the relative error in the measurement of the area of the room
*May 15, 2012 by tenzintsering*

**Math**

Teng is designing a house and in each room he can choose from tiles, floorboards, or carpet for the floor. a. How many combinations of flooring materials are possible if her designs a 2 room studio? b. How many combinations are possible for a 3 room apartment? c. How many ...
*December 8, 2013 by Michelle *

**math**

one third of the people in a convention room are seated in three-fourths of the chairs. THe rest of the people in the room decide to stand. If there are 8 empty chairs, how many people are standing? Please fully explain because i am sooo confused!!!
*April 4, 2012 by Audrey*

**Physics **

A student puts on a Dresden Dolls disc in her cd player which spins at 1800 revolutions per minute. A compact disc has a mass of about 0.016 kg and a radius of 6.0 cm. a) What is the period of rotation in seconds? b) What is the frequency of the rotating disc? c) What is the ...
*January 3, 2013 by Alex*

**Physics**

A student puts on a Dresden Dolls disc in her cd player which spins at 1800 revolutions per minute. A compact disc has a mass of about 0.016 kg and a radius of 6.0 cm. a) What is the period of rotation in seconds? b) What is the frequency of the rotating disc? c) What is the ...
*January 3, 2013 by Alex*

**English**

1. He went to the teachers' room. There were many teachers, and he was able to see some students scolded by a teacher. 2. The native speaker has his office. In the teacher's office, we talked with the foreign speaker. 3. The teacher's room is a little small, so only 15 ...
*April 21, 2010 by rfvv*

**math 1 question**

A student measures a rectangular room to be 20.0m x 17.16m. Which of the numbers below represents the room's area with the correct number of significant figures? 340m^2 343m^2 343.2m^2 343.20m^2 the correct answer is c but it says sig fig so is it b??? im having trouble with ...
*October 6, 2014 by SkatingDJ*

**science 1 question**

A student measures a rectangular room to be 20.0m x 17.16m. Which of the numbers below represents the room's area with the correct number of significant figures? 340m^2 343m^2 343.2m^2 343.20m^2 the correct answer is c but it says sig fig so is it b??? im having trouble with ...
*October 7, 2014 by SkatingDJ*

**history**

-the plan of Tutankhamun's tomb when Howard Carter found it- When did Carter go into the different rooms? What do you think? Put them in order. Number them 1-4. a. burial room ( ) b. treasure room ( ) c. small room ( ) d. long room ( ) -------- Whill you give me the answers to...
*December 5, 2013 by rfvv*

**physics**

a room that measures 10.o ft wide, 32.0 ft long, and 8.00 ft high needs a certain amount of air pumped into it per minute to keep the air quality up to regulations. If the room needs completly new air every 20.0 minutes, whjat is the volume of air per second that is being ...
*October 11, 2011 by vc*

**Math**

What is the cost of the room for that is used for 1.5 hours at the rate of $23 per month room and size of 288 sg ft?
*December 11, 2009 by Nora*

**science**

A room has large windows without curtains. The sunlight makes the room bright, but no one can see in. Is the glass opaque, translucent, or transparent?
*May 9, 2012 by raquel*

**English**

Q: What is the restroom at school called? Is it the boys' room or the girls' room? Is it the staff's room for teachers?
*March 27, 2013 by rfvv*

**Physics - 1**

An amusement park ride consists of a large vertical cylinder that spins about its axis fast enough that any person inside is held up against the wall when the floor drops away (Fig. P6.65). The coefficient of static friction between person and wall is μs, and the radius ...
*October 6, 2011 by Whitney*

**math**

the average weight of men in a meeting room is 170 pounds, and average weight of women is 130 pounds. if more than 60% of the people in the room are men, which of the following could be the average weight of all the people in the room?
*September 16, 2013 by math *

**Geometry**

the walls, floor, and ceiling of a room form a rectangular solid. The total surface are of the room is 992 square feet. The dimensions of the floor are 12 feet by 20 feet a. What is the lateral area of the room b. What is the height of the room.
*May 17, 2014 by Jake Monroe*

**biology**

Pretend you are taking a tour of a factory that creates macromolecules Describe your journey through the 4 rooms in the factory the Carbohydrate Room, the Lipid Room, the Protein Room, and the Enzyme Room. In each room, include the following: 1. What type of ...
*November 20, 2013 by Reina B.*

**Chemistry**

Your bedroom is 18 ft long and 15 ft wide, and the distance from floor to ceiling is 8 ft 6 in. You need to know the volume of the room in metric units for some scientific calculations. (a). What is the rooms volume in cubic meters? (b). What is the mass of air in the room in...
*October 3, 2011 by Nicole*

**Physics**

If centripetal force on an object in uniform circular motion is increased what is the effect on frequency of rotation if radius is constant. What is the effect on frequency and radius if both are free to vary. If veloicty increases, period is decreased, so frequency is increased.
*June 18, 2007 by Steve*

**Precal**

The equation is y=80.4- 11 ln x, 100<x<1500 Which approximates the minmum required ventilation rate in terms of the air sapace per child in a public school class room. In the model, x is the air space per child in cubic feet and y is the ventilation rate per child in ...
*March 31, 2011 by Ashlie*

**math**

The cost of carpeting a room 15m long with a carpet 70cm wide at Rs.8 per metre is Rs 1920.Find the bredth of the room.
*June 25, 2008 by Ayushi*

**Math**

A rectangular room measures 15ft by 21ft. How much will it cost to carpet this room if carpeting costs $17.95 per square yard?
*January 10, 2012 by Sara*

**physics!**

A centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. Such a device is used in medical laboratories, for instance, to cause the more dense red blood cells to settle through the less dense blood serum and collect at the ...
*February 14, 2011 by Gina*

**Physics**

A centrifuge is a device in which small container of material is rotated at a high speed on a circular path. Such a device is a used in medical laboratories, for instance, to cause the more dense red blood cells to settle through the less dense blood serum and collect at the ...
*July 15, 2011 by Kelli*

**Physics**

A centrifuge is a device in which small container of material is rotated at a high speed on a circular path. Such a device is a used in medical laboratories, for instance, to cause the more dense red blood cells to settle through the less dense blood serum and collect at the ...
*July 15, 2011 by Kelli*

**Physics!!**

A centrifuge is a device in which small container of material is rotated at a high speed on a circular path. Such a device is a used in medical laboratories, for instance, to cause the more dense red blood cells to settle through the less dense blood serum and collect at the ...
*July 18, 2011 by Kelli*

**physics**

A centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. Such a device is used in medical laboratories, for instance, to cause the more dense red blood cells to settle through the less dense blood serum and collect at the ...
*February 22, 2012 by Natasha*

**Physics**

A centrifuge is a device in which a small container of material is rotated at a high speed on a circular path. Such a device is used in medical laboratories, for instance, to cause the more dense red blood cells to settle through the less dense blood serum and collect at the ...
*October 3, 2013 by Tyler*

**physics**

As their booster rockets separate, Space Shuttle astronauts typically feel accelerations up to 3g, where g = 9.80 m/s2. In their training, astronauts ride in a device where they experience such an acceleration as a centripetal acceleration. Specifically, the astronaut is ...
*February 17, 2011 by kia*

**phy**

As their booster rockets separate, Space Shuttle astronauts typically feel accelerations up to 3g, where g = 9.80 m/s2. In their training, astronauts ride in a device where they experience such an acceleration as a centripetal acceleration. Specifically, the astronaut is ...
*February 17, 2011 by kia*

**math**

In a room of 20.000 ft^3 of air, 600 ft^3 of fresh air flows in per minute, and the mixture (made practically inform by circulating fans) is exhausted at a rate of 600 cubic feet per minute (cfm). What is the amount of fresh air inside the room y(t) at any time, if y(0)=0? ...
*August 8, 2012 by deel*

**math**

Alan built an additional room onto his house. the length of the room is 3 times the width. the perimeter of he room is 60 feet. What is the length of the room? a 7.5 feet b 22.5 feet
*February 9, 2009 by Anonymous*

**math**

Two restaurants have rooms to rent for dinner parties. One restaurant charges $100 to rent a room and $20 per person. The other restaurant charges $25 to rent the room and $25 per person. Which of the following is the number of people for which the cost of a dinner party would...
*July 13, 2014 by Roberta*

**math**

A circular room has radius equal to 40 feet. Marble is to be laid on a sector of the room. What is the area of the sector if the central angle is 45?
*March 3, 2011 by mariyah*

**math**

Mr Thomas wants to carpet his bed room. The size of the bed room is 15 feet x 27 feet. The carpet sells for $8.95 per square yard,installed. How much will he have to spend to carpet the bed room?
*March 27, 2012 by paul*

**physics**

The angular speed of the rotor in a centrifuge decreases from 226 to 186.0 rev/s with an angular deceleration of 6.4 rev/s2. During this period, how many revolutions does the rotor turn?
*July 29, 2013 by mike*

**physics**

At an amusement park there is a ride in which cylindrically shaped chambers spin around a central axis. People sit in seats facing the axis, their backs against the outer wall. At one instant the outer wall moves at a speed of 3.2 m/s, and an 83 kg person feels a 525 N force ...
*October 1, 2008 by Jen*

**physics**

At an amusement park there is a ride in which cylindrically shaped chambers spin around a central axis. People sit in seats facing the axis, their backs against the outer wall. At one instant the outer wall moves at a speed of 3.04 m/s, and an 65.2-kg person feels a 290-N ...
*October 8, 2012 by Jane*

**Physics**

At an amusement park there is a ride in which cylindrically shaped chambers spin around a central axis. People sit in seats facing the axis, their backs against the outer wall. At one instant the outer wall moves at a speed of 3.44 m/s, and an 64.3-kg person feels a 277-N ...
*October 3, 2013 by Tyler*

**math**

An elementary school has a large lunch room containing many tables. One day at lunch, the children at one table decide to see how long it will take to spread a rumor throughout the entire room. Each minute, the number of tables that know the rumor doubles in size. If it takes ...
*August 2, 2012 by Anonymous*

**math**

An elementary school has a large lunch room containing many tables. One day at lunch, the children at one table decide to see how long it will take to spread a rumor throughout the entire room. Each minute, the number of tables that know the rumor doubles in size. If it takes ...
*August 3, 2012 by Anonymous*

**physics**

If each of the three rotor helicopter blades is L = 3.69m long and has a mass of m = 159kg, calculate the moment of inertia of the three rotor blades about the axis of rotation.
*November 11, 2014 by katherine*

**Physics**

60) A class of 10 students taking an exam has a power output per student of about 200W. Assume the initial temperature of the room is 20 C and that its dimensions are 6.0 m by 15.0 m by 3.0 m. What is the temperature of the room at the end of 1.0 h if all the energy remains in...
*November 30, 2010 by Y0gi*

**math**

a room has a floor area of 1,025 ft^2 and a 10 ft high ceiling. the housing code requires at least 200 ft^3 per person. what is the maxium number of ppl allowed in the room?
*April 26, 2010 by nicole*

**physics**

A room is 13 ft. It needs to be painted. The ceiling is 8 ft above the floor. there are two windows int he room, each one is 3 ft by 4 ft. The door is 2.5 ft by 6.5 ft. What is the area of the wall and ceiling? 1 gallon of paint covers 64.37sq ft. How many gallons are needed ...
*June 16, 2011 by Anonymous*

**College**

A room is 13 ft. It needs to be painted. The ceiling is 8 ft above the floor. there are two windows int he room, each one is 3 ft by 4 ft. The door is 2.5 ft by 6.5 ft. What is the area of the wall and ceiling? 1 gallon of paint covers 64.37sq ft. How many gallons are needed ...
*June 16, 2011 by Anonymous*

**Math**

The Wilson family is at it again.. they are installing new carpet for their home. Their rectangular shaped living room is 25 feet long and 18 feet wide. THeir rectangular shaped game room is 4 feet shorter in both length and width of their living room. What is the area of the ...
*March 6, 2013 by Jerald*

**Physics**

A class of 11 students taking an exam has a power output per student of 124 W. Assume that the initial temperature of the room is 18.7C and that its dimensions are 6.00 m by 14.5 m by 3.40 m. What is the temperature (in C, do not enter units) of the room at the end of 55.0 ...
*February 9, 2011 by Kelsey*

**math**

miss Thao owns a small hotel with 30 identical rooms. she finds that if she charges a price of 12 dollars ( or less) per room per day, all the rooms are rented. for every 1 dollar in price, 2 rooms remain vacant. each day, maintenance cost 4 dollars per rented room and 1 for ...
*April 20, 2014 by nhokai!@#$%^&eru*

**physics/music**

A partially open window presents an opening 20cm wide. What kind of sounds from outside will go across the room in a well-defined beam? What kind will spread evenly throughout the room? Roughly what frequency marks the boundary between the two cases?
*February 9, 2012 by AAAA*

**please help me in math**

The two-way table shows the number of people whose hobbies are reading or solving puzzles and who either ride a motorcycle or dont ride a motorcycle. Among people whose hobby is reading, what is the relative frequency of not riding a motorcycle? Express your answer as a ...
*January 12, 2015 by Aspen*

**science**

One person talking softly in a room is about 60dB. If 100 people in the room are all talking at the same level the intensity is now?
*April 30, 2011 by Anonymous*

**physics**

A electric model train travels at 0.339 m/s around a circular track of radius 1.75 m. How many revolutions does it perform per second, i.e, what is the motion's frequency?
*March 14, 2013 by thuy*

**physics**

A electric model train travels at 0.339 m/s around a circular track of radius 1.75 m. How many revolutions does it perform per second, i.e, what is the motion's frequency?
*March 14, 2013 by thuy*

**Math**

-There are 7 girls in a room. -Each girl has 7 backpacks in the room. -In each backpack there are 7 big dogs. -For every big dog, there are 7 puppies too! HOW MANY LEGS ARE IN THE ROOM?
*February 13, 2008 by Glenn*

**physics**

A room has the dimensions 3.0 m by 4.0 m by 4.0 m . The air in the room is 79% N2( MW= 28) and 21% O2 (MW = 32). At a temperature of 20 degrees Celsius and pressure of 115 kPa , what is the mass of the air in the room in kilograms?
*November 28, 2011 by ED*

**math**

A rectangular room is 20 meters by 25 meets. It cost $20.00 per square meter to paint a room. How much would it cost
*January 27, 2015 by Anonymous*