Sunday

April 20, 2014

April 20, 2014

Number of results: 3,132

**math**

A design on a balloon is 6 cm wide when the balloon holds 44 cm to the third power of air. How much must the balloon hold for the design to be 24 cm wide? Since the "width" increases by a factor of 4, the volume will increase by a factor of 4^3 = 64, even if the balloon is not...
*Saturday, November 25, 2006 at 11:46pm by Susie*

**physics**

an empty rubber balloon has mass 0.0120kg, the balloon is filled with helium of density 0.181 kg/m^3. the balloon is spherical w/ radius 0.500m. if the balloon is ties to a vertical string, what is thw tension in the string? density of air 1.29 kg/m^3
*Saturday, December 15, 2012 at 9:28pm by Helen*

**calculus**

A spherical balloon is being inflated at a rate of 10 cubic inches per second. How fast is the radius of the balloon increasing when the surface area of the balloon is square inches? Enter your answer correct to 3 decimal places.
*Friday, March 25, 2011 at 7:06pm by Anonymous*

**physics**

An empty rubber balloon has a mass of 0.0100 kg. The balloon is filled with helium at a density of 0.181 kg/m3. At this density the balloon is spherical with a radius of 0.300 m. If the filled balloon is fastened to a vertical line, what is the tension in the line?
*Monday, December 20, 2010 at 3:24pm by april*

**Calculus**

A spherical balloon is being inflated at a rate of 10 cubic inches per second. How fast is the radius of the balloon increasing when the surface area of the balloon is 2pi square inches? Enter your answer correct to 3 decimal places.
*Monday, March 28, 2011 at 4:39pm by Anonymous*

**AP Chemistry**

The buoyant force on a balloon is equal to the mass of air it displaces. The gravitational force on the balloon is equal to the sum of the masses of the balloon, the gas it contains, and the balloonist. If the balloon and balloonist together weight 175 kg, what would the ...
*Monday, October 11, 2010 at 4:37pm by Emma*

**Math**

Martina and Carl are part of a team that is studying weather patterns. The team is about to launch a weather balloon to collect data. Martina's rope is 7.8 m long and makes an angle of 36.0 deg with the ground. Carl's rope is 5.9 m long. Assuming that Martina and Carl form a ...
*Wednesday, February 5, 2014 at 4:54am by McKenna Louise*

**physics**

How big would a spherical helium balloon have to be to lift a 70kg person? The mass of the balloon's skin is 4.0kg
*Tuesday, November 19, 2013 at 12:59am by sandra*

**College Math**

A spherical balloon has a radius of 9 centimeters. Find the amount of air required to fill the balloon. Round to the nearest hundredth
*Monday, March 26, 2012 at 5:00pm by Rochelle Finister*

**Physics**

What minimum sized balloon would you have to fill in order to be able to be lifted into the air? Take your mass to be 100 kilograms and the temperature of the outside air to be 20 degrees C. Neglect the mass of the balloon rubber and basket and assume that the balloon is ...
*Friday, March 15, 2013 at 4:07pm by steve*

**Physics**

A spherical helium filled balloon is attached to a string that is fixed to the ground. the balloon has a volume of .30/4m^3 and helium has a density of .20 kg/m^3. What is the weight of the balloon and helium if the tension on the string is .8N?
*Friday, October 11, 2013 at 1:41pm by George*

**chemistry**

A weather balloon is inflated to a volume of 27.0 at a pressure of 730 and a temperature of 31.3. The balloon rises in the atmosphere to an altitude, where the pressure is 365 and the temperature is -14.6. Assuming the balloon can freely expand, calculate the volume of the ...
*Sunday, October 12, 2008 at 5:31pm by Lili*

**Physics**

A weather balloon carrynig a data measurement(DM) is rising quickly at a constant velocity, U. when its 60m above ground, balloon pops and the dm experiences freefall. It reaches ground 4 seconds after the balloon pops. If DM set hits ground at speed greater than 40 ms-1 it ...
*Monday, June 24, 2013 at 3:14am by Vanessa*

**Physics**

The instruments attached to a weather balloon have a mass of 5.2 kg. The balloon is released and exerts an upward force of 98 n on the instruments. A)what is the acceleration of the balloon and instruments? B) after the balloon has accelerated for 10s, the instruments are ...
*Saturday, January 12, 2013 at 12:40am by Jules*

**Chemistry**

The buoyant force on a balloon is equal to the mass of air it displaces. The gravitational force on the balloon is equal to the sum of the masses of the balloon, the gas it contains, and the balloonist. If the balloon and balloonist together weight 175 kg, what would the ...
*Monday, October 11, 2010 at 7:59pm by Emma*

**calculus**

Air is being pumped into a spherical balloon so that its volume increases at a rate of 80cm^3/s. How fast is the surface area of the balloon increasing when its radius is 7cm?
*Thursday, October 29, 2009 at 6:53pm by Ash*

**Physics**

A spherical helium filled balloon is attached to a string that is fixed to the ground. the balloon has a volume of .30/4m^3 and helium has a density of .20 kg/m^3. What is the weight of the balloon and helium if the tension on the string is .8N? What is the Gravitational force...
*Friday, October 11, 2013 at 3:32pm by George*

**Physics**

A spherical helium filled balloon is attached to a string that is fixed to the ground. the balloon has a volume of .30/4m^3 and helium has a density of .20 kg/m^3. What is the weight of the balloon and helium if the tension on the string is .8N? What is the Gravitational force...
*Friday, October 11, 2013 at 3:34pm by George*

**calculus**

air is being pumped into a spherical balloon at a rate of 8 cm^3/min. Find the rate at which the radius of the balloon is increasing when the balloon's radius is 5 cm.
*Monday, April 8, 2013 at 1:17am by marisol*

**AP Chemistry**

The buoyant force on a balloon is equal to the mass of air it displaces. The gravitational force on the balloon is equal to the sum of the masses of the balloon, the gas it contains, and the balloonist. If the balloon and balloonist together weight 175 kg, what would the ...
*Tuesday, October 12, 2010 at 12:19am by Em*

**Calculus**

t: 0 2 5 7 11 12 r'(t): 5.7 4.0 2.0 1.2 0.6 0.5 The volume of a spherical hot air balloon expands as the air inside the balloon is heated. The radius of the balloon in feet is modeled by a twice-differentiable function of r of time t, where t is measured in minutes. For 0<t...
*Tuesday, November 25, 2008 at 7:54pm by Craig*

**trig**

weather balloon is directly west of two observing stations that are 10 mi apart. The angles of elevation of the balloon from the two stations are 17.6 degrees and 78.2 degrees. How high is the balloon?
*Monday, October 8, 2012 at 8:58am by alth*

**algebra**

A weather balloon is directly west of two observing stations that are 10 miles apart. The angles of elevation of the balloon from the two stations are 17.6 degrees and 78.2 degrees. How high is the balloon?
*Saturday, December 8, 2012 at 1:01am by judy*

**Urgent Help needed in PHYSICS!**

A spherical balloon is inflated to a diameter of 20.0 cm. Assume that the gas in the balloon is of atmospheric pressure (101.3 kPa) and is at a temperature of 20.0 ¡ãC. It is then taken by a diver 15.0 m under the sea. The temperature of the seawater at this depth is 16.0 ¡ãC...
*Tuesday, April 9, 2013 at 6:34pm by tommy*

**science**

A weather balloon carries instruments that measure temperature, pressure, and humidity as it rises through the atmosphere. Suppose such a balloon has a volume of 1.2 m^3 at sea level where the pressure is 1 atm and the temperature is 20°C. When the balloon is at an altitude of...
*Saturday, November 19, 2011 at 11:58pm by Shirley*

**chemistry**

if the pressure on a 100-L weather balloon changes from 1.0 atom to 2.0atom, what would be the volume of the balloon at the higher pressure? Assume the temperature does not changes and the balloon has no leaks. what is the volume = to
*Monday, March 28, 2011 at 12:47am by jacques shaw*

**calculus**

Air is being pumped into a spherical balloon so that its volume increases at a rate of 80 cubic centimeters per second. How fast is the surface area of the balloon increasing when its radius is 8 cm?
*Thursday, February 25, 2010 at 6:15pm by idk*

**math**

Air is pumped into a balloon such that its volume increases at the rate of 75cm^3 per second. It is assumed that the balloon is spherical all the time. Find in term of pi the rate at which the radius of teh balloon is increasing when the radius is 5cm. Given the balloon was ...
*Thursday, March 27, 2014 at 6:33am by rosa*

**chemistry**

a weather balloon with a 2 meter diameter at ambiient tempatures holds 525 grams of helium. what type of electroniic probe could be used to determine the pressure inside the balloon
*Tuesday, January 18, 2011 at 4:05pm by eric*

**Chemistry**

need to know how to solve the following.... a gas filled weather balloon floating in the atomsphere has an initial volume of 850 L. The balloon rises to a region where the pressure is 56 kPa and its volume expands to 1700 L. If the temperature remains the same, what was the ...
*Tuesday, September 6, 2011 at 7:22pm by remraf*

**Chemistry**

2 moles of helium (He) are pumped from a gas canister into a weather balloon. The balloon at this point has a volume V1. 1 mole of nitrogen gas (N2) is added at the same temperature and pressure. The volume of the balloon changes to V2. How will the new volume of the balloon ...
*Wednesday, April 17, 2013 at 11:38pm by Colin*

**Physics**

A balloon with a mass of 90 kg is filled with helium (density = 0.179 kg/m3). The balloon is spherical and has a diameter of 11.0 m. What is the maximum mass that can be attached to the bottom of this this helium balloon, for it to be able to fly? The density of air is 1.29 kg...
*Thursday, January 17, 2013 at 5:28pm by Alphonse*

**chemistry**

The volume of a weather balloon increases as the balloon rises in the atmosphere. Why doesn’t the drop in temperature at higher altitudes cause the volume to decrease?
*Tuesday, March 4, 2008 at 5:39pm by terry*

**Trig**

A weather balloon is sighted between points A and B which are 5 miles apart on level ground. The angle of elevation of the balloon from A is 37 degrees and it's angle of elevation from B is 58 degrees. Find the height, in feet, of the balloon above the ground.
*Wednesday, March 5, 2014 at 12:52pm by Nairb*

**physical science**

A Weather balloon carries instruments that measure temperature, pressure, and humidity as it rises through the atmosphere. Suppose such a balloon has a volume of 1.2 m3 at sea level where the pressure is 1 atm and the temperature is 20oC. When the balloon is at an altitude of ...
*Thursday, October 4, 2012 at 8:44pm by maria*

**Physics**

A 1.8-g balloon is filled with helium gas. When a mass of 4.8 g is attached to the balloon, the combined mass hangs in static equilibrium in midair. Assuming that the balloon is spherical, what is its diameter? (The density of helium is 0.179 kg/m3, and the density of air is 1...
*Monday, November 7, 2011 at 3:34am by mymi*

**UNM**

In an air-conditioned room at 19.0C , a spherical balloon had the diameter of 50.0cm . When taken outside on a hot summer day, the balloon expanded to 51.0cm in diameter. What was the temperature outside? Assume that the balloon is a perfect sphere and that the pressure and ...
*Saturday, October 3, 2009 at 2:16am by Monica *

**physics**

The instruments attached to a weather balloon in the figure below have a mass(m) of 5.0 kg. The balloon is released and exerts an upward force(F) of 92 N on the instruments.
*Tuesday, November 2, 2010 at 10:55pm by eden*

**Physics**

A spherical hydrogen-filled balloon is used to lift a load of 5950 N (in addition to the weight of the hydrogen). Suppose the density of the air is 1.18 kg/m3. Find the minimum necessary radius for the balloon
*Thursday, April 3, 2014 at 5:18pm by Jason*

**physics**

a weather balloon carries instruments that measure temperature,pressure and humidity as it rises through the atmosphere.Suppose such a balloon has a volume of 1.2 m^3 at sea level where the pressure is 1 atm and the temperature is 20 degree Celsius.When the balloon is at an ...
*Tuesday, November 1, 2011 at 5:03pm by jennaq*

**physics**

A spherical balloon has a radius of 6.76 m and is filled with helium. How large a cargo can it lift, assuming that the skin and structure of the balloon have a mass of 950 kg? Neglect the buoyant force on the cargo volume itself.
*Sunday, April 18, 2010 at 3:17pm by Anonymous*

**calculus**

A spherical balloon is leaking air at 2 cubic inches per hour. How fast is the balloon's radius changing when the radius is 2 inches.
*Monday, January 9, 2012 at 3:59pm by Jordan*

**calculus**

A spherical balloon is inflated so that its volume is increasing at the rate of 2.2 ft^3/min. How rapidly is the diameter of the balloon increasing when the diameter is 1.2 feet?
*Wednesday, October 6, 2010 at 5:09pm by Jorge*

**physics12**

The instruments attached to a weather balloon have a mass of 5.1 kg. (a) The balloon is released and exerts an upward force of 102 N on the instruments. What is the acceleration of the balloon and instruments? (b) After the balloon has accelerated for 13 seconds, the ...
*Sunday, December 11, 2011 at 9:09pm by Hannah*

**Calculus**

a spherical balloon is inflated with gas at the rate of 500 cubic centimeters per minute. how fast is the radius of the balloon increasing at the instant the radius is 30 centimeters?
*Sunday, November 1, 2009 at 8:39am by Anonymous*

**math**

a boy is blowing a spherical balloon at a rate of 50 cm3/s.at what rate is the radius of the balloon changing when the radius is 10 cm?give your answer to 2 decimal places.
*Tuesday, October 11, 2011 at 8:00pm by jj*

**math**

a boy is blowing a spherical balloon at a rate of 50 cm3/s.at what rate is the radius of the balloon changing when the radius is 10 cm?give your answer to 2 decimal places.
*Tuesday, October 11, 2011 at 8:25pm by jj*

**Calculus**

Air is being pumped into a spherical balloon so that its volume increases at a rate of 30 cubic centimeters per second. How fast is the surface area of the balloon increasing when its radius is 19 cm? V= 4/3*pi*r^3 S= 4 pi r^2
*Thursday, September 24, 2009 at 10:32pm by Z32*

**physics**

the instruments attached to a weather balloon have a mass of 5.0 kg. the balloon is released and exerts an upward force of 98 N on the instruments. (a) what is the acceleration of the balloon and instruments? (answer is 9.8 m/s^2.. just dont know how to get there..) (b)after ...
*Monday, October 10, 2011 at 11:27pm by tayler*

**physics**

the instruments attached to a weather balloon have a mass of 5.0 kg. the balloon is released and exerts an upward force of 98 N on the instruments. (a) what is the acceleration of the balloon and instruments? (answer is 9.8 m/s^2.. just dont know how to get there..) (b)after ...
*Monday, October 10, 2011 at 11:37pm by tayler*

**calculus**

a spherical balloon filled with gas has a leak that permits the gas to escape at a rate of 1.5 cubic meters per minute. how fast is the surface area of the balloon shrinking when the radius is 4 meters?
*Thursday, November 7, 2013 at 2:54pm by james*

**Physics**

I need help on two problems :P 1. A spherical balloon is partially blown up and its surface area is measured. More air is added increasing the volume of the balloon. If the surface area of the balloon expands by a factor of 2.0 during this procedure, by what factor does the ...
*Wednesday, September 1, 2010 at 10:17am by Johnny*

**Math**

A spherical balloon expands when it is taken from the cold outdoors into a warm house. If the surface area increases by 50% (factor of 1.50), by what percentage does the radius of the balloon change? a)7.7% b)50% c)100% d)75% e)22%
*Wednesday, September 8, 2010 at 1:31am by Johnny*

**Chemistry**

A weather balloon with a volume of 3.86934 L is released from Earth’s surface at sea level.What volume will the balloon occupy at an altitude of 20.0 km, where the air pressure is 10 kPa? Answer in units of L
*Sunday, March 2, 2014 at 11:43pm by Lisa*

**AP calculus AB**

A spherical balloon is being filled with air in such a way that its radius is increasing at a rate of 2 centimeters per second. At what rate is the volume of the balloon changing at the instant when its surface has an area of 4 pi square centimeters.
*Wednesday, December 29, 2010 at 4:40am by jennifer*

**calc**

im so confused :( Willie Makit blows up a spherical balloon. He recalls that the volume is V=4/3Pi*r^3. In order for the radius to increase at 2cm/sec, how fast must Willie blow air into the balloon when the radius is 3 cm?
*Wednesday, December 29, 2010 at 5:22pm by me*

**help on calculus**

A spherical balloon is being filled with air in such a way that its radius is increasing at a rate of 2 centimeters per second. At what rate is the volume of the balloon changing at the instant when its surface has an area of 4 pi or 12.56637061 square centimeters?
*Thursday, December 30, 2010 at 8:20pm by winston*

**physics**

A small weather rocket weighs 15.5 N. The rocket is carried up by the balloon. The rocket is released from the balloon and fired, but its engine exerts an upward force of 11.0 N. What is the acceleration of the rocket?
*Sunday, October 3, 2010 at 5:16pm by devon*

**Chemistry-Please help**

In an air-conditioned room at 19.0 degree celsius , a spherical balloon had the diameter of 50.0cm . When taken outside on a hot summer day, the balloon expanded to 51.0cm in diameter. What was the temperature outside in degree celsius? Assume that the balloon is a perfect ...
*Thursday, October 15, 2009 at 11:13pm by Rose*

**Physics**

A balloon with a mass of 100 kg is filled with helium (density = 0.179 kg/m3). The balloon is spherical and has a diameter of 12.0 m. What is the maximum mass that can be attached to the bottom of this this helium balloon, for it to be able to fly? The density of air is 1.29 ...
*Wednesday, December 1, 2010 at 12:03am by Nicole*

**related rates problem-calculus**

A spherical balloon is being filled with air in such a way that its radius is increasing at a rate of 2 centimeters per second. At what rate is the volume of the balloon changing at the instant when its surface has an area of 4 pi square centimeters?
*Thursday, December 30, 2010 at 3:25pm by james*

**Math**

A ground observer sights a weather balloon to the east at an angle of elevation of 15º. A second observer 3 miles to the east of the first also sights the balloon to the east at an angle of elevation of 24º. How high is the balloon?
*Thursday, August 1, 2013 at 11:42am by William320*

**science**

You are a maker of hot air balloons and wish to construct a balloon that will lift you and a friend to places unknown. Your standard balloon design is a perfectly spherical, nylon fabric balloon with a small hole on the bottom for the burner that heats the air. Nylon starts to...
*Thursday, April 11, 2013 at 12:10pm by Sahil*

**calculus**

gas is pumped into a spherical balloon at the rate of 1 cubic feet per minute. How fast is the diameter of the balloon increasing when the balloo0n contains 36 cubic feet of gas?
*Wednesday, October 6, 2010 at 5:09pm by Joshie*

**chemistry**

A weather balloon is inflated to a volume of 27.0 at a pressure of 730 and a temperature of 31.3. The balloon rises in the atmosphere to an altitude, where the pressure is 365 and the temperature is -14.6. use as a ideal gas behavior
*Sunday, October 12, 2008 at 5:31pm by Lili*

**physics**

A small weather rocket weighs 14.7 N. The rocket is carried up by a balloon. The rocket is released from the balloon and fired, and its engine exerts an upward force of 10.2 N on the rocket. What is the acceleration of the rocket?
*Wednesday, August 17, 2011 at 10:40pm by Anonymous*

**math**

a spherical balloon with radius r inches has volume V9r) =(4/3)πr^3. Find a function that represents the amount of air required to inflate the balloon from a radius of r inches to a radius of r+1 inches
*Sunday, September 12, 2010 at 10:29pm by Sasha*

**chemistry**

what would happen to the volume of the 100-L weather balloon if its temperature increases from 25 degrees Celsius to 125 degrees Celsius while the external pressure remains constant? Again, there are no leaks in the balloon.
*Monday, March 28, 2011 at 12:52am by jacques shaw*

**Calculus**

A spherical balloon with a radius "r" inches has volume V(r)=(4/3)(pi)(r^3). Find the function that represents the amount of air required to inflate the balloon from a radius of "r" inches to a radius of r+1 inches.
*Saturday, September 22, 2007 at 2:59pm by Raj*

**math**

A spherical balloon with radius r inches has volume V (r) = 4 3 r3 . Find the function f(r) that represents the amount of air required to inflate the balloon from a radius of r inches to a radius of r + 2 inches.
*Thursday, May 5, 2011 at 9:07pm by Renaldo Nguyen*

**physics**

If you live in a city your stove can be powered by natural gas. This gas is mainly methane gas and has a density of about 0.72 kilograms per cubic meter. What minimum sized balloon would you have to fill in order to be able to be lifted into the air? Take your mass to be 75 ...
*Wednesday, March 14, 2012 at 5:53pm by dale*

**Physics :(( help please TT**

You are a maker of hot air balloons and wish to construct a balloon that will lift you and a friend to places unknown. Your standard balloon design is a perfectly spherical, nylon fabric balloon with a small hole on the bottom for the burner that heats the air. Nylon starts to...
*Friday, April 12, 2013 at 7:41pm by Ian*

**Physics**

After rubbing a balloon against someone's hair, a balloon has accumulated a static electric charge. The air inside the balloon has the same density as the air outside of the balloon, and the balloon itself weighs 1.41mN. How many free electrons are there on the surface of the ...
*Monday, January 30, 2012 at 9:18pm by Anonymous*

**C Programming**

I don't know what to do now. Below is my code I have so far but I have no idea what to do next. Here's the prompt for what the program should do: Welcome to the Weather Balloon Altitude and Velocity Program. Enter the Balloon's Starting Time: 1 Enter the Time Increment: 2.2 ...
*Friday, October 2, 2009 at 8:36pm by gnozahs*

**Calculus**

A spherical balloon with a radius r inches has volume V(r)= 4/3 Pi r^3. Find a function that represents the amount of air required to inflate the balloon from a radius of r inches to a radius of r+1 inches. An explanation would be appreciated, as I have no clue how to even begin.
*Saturday, September 11, 2010 at 6:04pm by Chelsea*

**Chemistry**

A weather balloon is inflated to a volume of 29.6 L at a pressure of 734 mmHg and a temperature of 27.0 C. The balloon rises in the atmosphere to an altitude, where the pressure is 360 mmHg and the temperature is -13.6 C.
*Monday, November 8, 2010 at 11:26pm by Lisa*

**Chemistry**

A weather balloon at Earth's surface has a volume of 4.00 L at 304 K and 755 mm Hg.? If the balloon is released and the volume reaches 4.08 L at 728 mm Hg, what is the temperature? What gas law do you use?
*Friday, May 21, 2010 at 8:09am by Jake*

**Calculus**

Air is being pumped into a spherical balloon and the volume is increasing at the rate of 100 cubic cm per minute. How fast is the radius of the balloon increasing when the radius is 10 cm? (V=4/3 times pie times r^3)
*Monday, October 15, 2012 at 11:54am by Anonymous*

**Word Problem-Calculus**

A spherical balloon is being inflated in such a way that its radius increases at a rate of 3 cm/min. If the volume of the balloon is 0 at time 0, at what rate is the volume increasing after 5 minutes? my answer is 45 cm/min. is this right. thanks
*Thursday, March 14, 2013 at 2:13pm by Mark*

**Trig**

From two different tracking stations, a weather balloon is spotted from two angles of elevation, 57degrees and 83 degrees, respectively. The tracking stations are 15 km apart. Find that altitude of the balloon. Any help given will be greatly appriciated
*Tuesday, July 20, 2010 at 4:22pm by Sonia*

**physiscs**

A spherical balloon has an area of 7.1076 m2.How to you calculate the volume?
*Thursday, January 20, 2011 at 8:35pm by Joe*

**Pre Cal**

Two tracking stations are on the equator 158 miles apart. A weather balloon is located on a bearing of N 41degrees E from the western station and on a bearing of N 21degrees E from the eastern station. How far is the balloon from the western station.
*Monday, April 9, 2012 at 2:53pm by Kara*

**trig**

Two tracking stations are on the equator 134 miles apart. A weather balloon is located on a bearing of N 38°E from the western station and on a bearing of N 19°E from the eastern station. How far is the balloon from the western station? Round to the nearest mile.
*Wednesday, March 28, 2012 at 11:26am by Anonymous*

**Physics**

Calculate the volume of a spherical balloon which has a surface area of 0.0793 m2
*Tuesday, January 11, 2011 at 3:49pm by Megan*

**physics**

A lost shipping container is found resting on the ocean floor and completely submerged. The container is 5.7 m long, 2.7 m wide, and 2.3 m high. Salvage experts attach a spherical balloon to the top of the container and inflate it with air pumped down from the surface. When ...
*Sunday, March 10, 2013 at 9:07pm by chel*

**Physics**

A lost shipping container is found resting on the ocean floor and completely submerged. The container is 6.0 m long, 2.2 m wide, and 2.3 m high. Salvage experts attach a spherical balloon to the top of the container and inflate it with air pumped down from the surface. When ...
*Saturday, April 19, 2014 at 6:56pm by Linda*

**advanced functions**

let me rewrite the question: the height,h, in metres, of a weather balloon above the ground after t seconds can be modelled by the function h(t)=-2t^3+3t^2+149+410, for 0<t<10. when is the balloon exactly 980 m above the ground my bad i messed up the number
*Thursday, February 20, 2014 at 5:13pm by collard*

**chemistry**

A spherical rubber balloon has an initial thickness of 0.45mm, and diameter 250mm. Final diameter of 1000mm. Find final thickness, true stress in the plane of the balloon wall, Air pressure required. (Assume rubber is idea and obeys Guassian statistics, and take the shear ...
*Wednesday, May 5, 2010 at 11:22am by nick*

**Chemistry**

A spherical rubber balloon has an initial thickness of 0.45mm, and diameter 250mm. Final diameter of 1000mm. Find final thickness, true stress in the plane of the balloon wall, Air pressure required. (Assume rubber is idea and obeys Guassian statistics, and take the shear ...
*Thursday, May 6, 2010 at 9:05am by nick*

**Physics**

I found the first three parts of the question but I can't figure out part d. The instruments attached to a weather balloon in the figure below have a mass(m) of 5.5 kg. The balloon is released and exerts an upward force(F) of 109 N on the instruments. (a) What is the ...
*Sunday, January 3, 2010 at 2:20pm by Sasha*

**Calc**

Air is being pumped into a spherical balloon so that its volume increases at a rate of 90{cm}^3/s. How fast is the surface area of the balloon increasing when its radius is 7{cm}? Recall that a ball of radius r has volume \displaystyle V={4}/{3}pie r^3 and surface area S=4\pi r^2
*Sunday, March 15, 2009 at 10:03pm by Vince*

**polymer chemistry**

A spherical rubber balloon has an initial thickness of 0.45mm, and diameter 250mm. Final diameter of 1000mm. Find final thickness, true stress in the plane of the balloon wall, Air pressure required. (Assume rubber is idea and obeys Guassian statistics, and take the shear ...
*Wednesday, May 5, 2010 at 11:31am by nick*

**College Chemistry**

A spherical rubber balloon has an initial thickness of 0.45mm, and diameter 250mm. Final diameter of 1000mm. Find final thickness, true stress in the plane of the balloon wall, Air pressure required. (Assume rubber is idea and obeys Guassian statistics, and take the shear ...
*Thursday, May 6, 2010 at 4:05pm by nick*

**science**

On what? the weather? an inflated tire? a balloon? flight of aircraft?
*Monday, January 25, 2010 at 9:27pm by DrBob222*

**Chemistry**

You have two gas-filled balloons, one containing He and the other containing H2. The H2 balloon is twice the size of the He balloon. The pressure of gas in the H2 balloon is 1 atm, and that in the He balloon is 2 atm. The H2 balloon is outside in the snow (−5 °C), and ...
*Friday, March 30, 2007 at 1:32am by Luis*

**trig**

Two tracking stations are on the equator 135 miles apart. A weather balloon is located on a bearing of N 37 degrees E from the weastern station and on a bearing of N 19 degrees E from the eastern station. How far is the balloon from the weastern station?
*Sunday, April 21, 2013 at 3:32pm by Taylor*

**Math**

A spherical balloon has a circumference of 10 inches. If it expands to twice the volume, what happens to its surface area?
*Tuesday, July 30, 2013 at 8:38pm by Anonymous*

**Chemistry **

You have two gas-filled balloons, one containing He and the other H2. The H2 balloon is twice the size of the He balloon (let the He balloon have a volume of 1 -L and the H2 balloon. a volume of 2 L). The pressure of gas in the H2 balloon is 1 atm while that in the He balloon ...
*Sunday, February 19, 2012 at 8:43pm by Bria*

**Calculus**

Air is being pumped into a spherical balloon so that its volume increases at a rate of 80 cm^3 per second. How fast is the surface area of the balloon increasing when its radius is 9cm? * ball of radius r has volume V=(4/3)pi r^3 and surface area S=4pir^2 ** I try to do it ...
*Thursday, October 25, 2012 at 7:42pm by Susanna*

**Math**

A water balloon is shot into the air so that its height h, in metres, after t seconds is h = —4.9t^2 + 27t + 2.4 a)How high is the balloon after 1 s? b)For how long is the balloon more than 30 m high? c)What is the maximum height reached by the balloon? d)When will the balloon...
*Thursday, January 22, 2009 at 5:59pm by gagan*

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