# George

Most popular questions and responses by George-
## Chemistry

If it takes three "breaths" to blow up a balloon to 1.2 , and each breath supplies the balloon with 0.060 moles of exhaled air, how many moles of air are in a 3.0 balloon. Express your answer in moles using two significant figures Would the answer be 0.38

*asked on September 17, 2008* -
## chemistry

Which of the following has the greatest buffer capacity? There are three separate problems below. 1. 0.40 M CH3COONa / 0.20 M CH3COOH 2. 0.40 M CH3COONa / 0.60 M CH3COOH 3. 0.30 M CH3COONa / 0.60 M CH3COOH Thanks!

*asked on July 17, 2010* -
## chemistry

Current is applied to a molten mixture of CuF, ZnCl2, and AlBr3. What is produced at the cathode? a)F2 b)Al c)Cu d)Zn e)Cl2 f)Br2 What is produced at the anode? Same options as above.

*asked on May 29, 2012* -
## chemistry

In the REDOX reaction in basic solution Zn-->Zn(OH)4+H2 I know that the first half reaction is 4H20+Zn-->Zn(OH)4 +4H+e but the second one is either 2e+2H2O--->H2+2OH (WHICH IS THE ANSWER GIVEN ON THE WORKSHEET) OR 2e+2H-->H2 I think both leads to the same

*asked on November 4, 2010* -
## AP Calculus AB Part 2

The Riemann sum, the limit as the maximum of delta x sub i goes to infinity of the summation from i equals 1 to n of f of the quantity x star sub i times delta x sub i , is equivalent to the limit as n goes to infinity of the summation from i equals 1 to n

*asked on January 26, 2018* -
## physics

The cheetah can reach a top speed of 114km/h (71mi/h). While chasing its prey in a short sprint, a cheetah starts from rest and runs 50m in a straight line reaching a final speed of 91 km/h. a.) Determine the cheetah's average acceleration during the short

*asked on February 3, 2013* -
## Calculus

A rectangular swimming pool is to be built with an area of 1800 square feet. The owner wants 5-foot wide decks along either side and 10-foot wide decks at the two ends. Find the dimensions of the smallest piece of property on which the pool can be built

*asked on October 25, 2008* -
## Physics

A cube of wood with a density of 0.780 g/cm3 is 10.0 cm on each side. When the cube is placed in water, what buoyant force acts on the wood? (ρw = 1.00 g/cm3) a. 5.00 N b. 6.40 N c. 7.65 N d. 7.65 x 10^3 N

*asked on December 19, 2011* -
## calculus

A rectangular box has a square base with an edge length of x cm and a height of h cm. The volume of the box is given by V = x2h cm3. Find the rate at which the volume of the box is changing when the edge length of the base is 12 cm, the edge length of the

*asked on January 17, 2015* -
## chemistry

SiH3- planar or pyramidal geometric shape?

*asked on May 8, 2011* -
## Chem

How many grams of Ni would be electroplated if a constant current of 7.2 amperes is passed through a solution of NiSO4 for 90.0 min?

*asked on March 19, 2013* -
## Pre calc

The population of a Midwestern city decays exponentially. If the population decreased from 900,000 to 800,000 from 2003 to 2005, what will be the population in 2008? I thought it was 7542 but it is wrong can someone please help me thank you

*asked on March 9, 2017* -
## college chemistry

. One possible use for the cooking fat left over after making french fries is to burn it as fuel. Formula (for cooking fat) = C51H88O6 Density = 0.94 g/ml ΔH°f = - 1310 kJ/mol. Write a balanced equation of the combustion of cooking fat (the products are

*asked on April 17, 2010* -
## physics

Save Two children hang by their hands from the same tree branch. The branch is straight, and grows from the tree trunk at an angle of 27 degrees above the horizontal. One child, with a mass of 39 kg is hanging 1.50 m along the branch from the tree trunk.

*asked on November 17, 2014* -
## Social Studies

I am having a hard time with economics - we just started in my social studies class. Can I have help with my homework, please? 1. What phrase best defines competition? (1 point) just one main buyer of a good or service just one main seller of a good or

*asked on November 2, 2012* -
## chemistry

The following equation represents the partial combustion of methane, CH4. 2CH4(g) + 3O2(g) > 2CO(g) + 4H2O(g) At constant temperature and pressure, what is the maximum volume of carbon monoxide that can be obtained from 3.39 x 102 L of methane and 1.70 x

*asked on October 4, 2014* -
## Chemistry

What would be the whole name of 2-butene and hydroiodic acid. Or the diagram. h h Any help would be greatly appreciated.

*asked on November 19, 2008* -
## Physics

The Achilles tendon is attached to the rear of the foot as shown in (Figure 1) . A person elevates himself just barely off the floor on the "ball of one foot." Assume the person has a mass of 65kg and D is twice as long as d. Find the tension FT in the

*asked on June 10, 2014* -
## math 11

Michaela has up to $20 to spend on bottled water and orange juice for a group hike. It cost $2 for each bottle of water and $ 4 for each bottle pdf orange juice. write an inequality statement of this situation? 2x +4y< or equal to 20 Y < or equal to-1/2x

*asked on April 15, 2018* -
## Calculus

The hypotenuse of a right triangle has one end at the origin and one end on the curve y=x^(7)e^(-7x) , with x greater than or equal to 0. One of the other two sides is on the x-axis, the other side is parallel to the y-axis. Find the maximum area of such a

*asked on October 21, 2008* -
## Geometry

The volume of two similar rectangular prisms are 64cm^3 and 1000cm^3. The surface area of the smaller figure is 112cm^2. What is the surface area in square centimeters of the larger figure?

*asked on September 29, 2013* -
## chemistry

The ionization constant Ka of an indicator HIn is 1.0x10^-6. The color of the nonionized form is red and that of the ionized form is yellow. What is the color of this indicator in a solution whose pH is 4.00? Thanks!

*asked on July 18, 2010* -
## science

The orbital radii of four planets in our solar system are shown in the following table. Orbital Radii Planet Orbital Radii (AU) W 5.2 X 0.72 Y 1.0 Z 19.1 Which planet is likely to experience the highest temperature? W X Y Z I think it is B.x but I am not

*asked on May 10, 2018* -
## Physics

A golf ball with an initial angle of 34 degrees lands exactly 240 m down the range on a level course. a.) Neglecting air friction, what initial speed would achieve this result? b.) Using the speed determined in item a, find the maximum height reached by

*asked on October 5, 2016* -
## College Chemistry

H2C=C=CH2 molecule is linear, what are they hybridization states of the carbon atoms? draw diagrams to show sigma and pi bonds.

*asked on May 8, 2011* -
## chemistry

When 34.1 g of lead reacts with 6.81 L of oxygen gas, measured at 1.00 atm and 25.0°C, 36.1 kJ of heat is released at constant pressure. What is DH° for this reaction?

*asked on October 5, 2014* -
## physics

A man in a maze makes 3 consecutive displacements. His first displacement is 5.40m westward, and the second is 18.0m northward. At the end of his displacement he is back to where he started. Use the graphical method to find the magnitude and direction of

*asked on January 28, 2013* -
## Geometry

A 5 foot tall woman stands 15ft from a statue. She must look up at an angle of 60 degrees to see the top of the statue. How tall is the statue?

*asked on September 25, 2013* -
## chemistry

how to calculate the mass of hydrogen in 150.0 g of ethene

*asked on January 22, 2013* -
## Geometry

A regular pentagonal solid prism has 9cm base edges. A larger, similar solid prism of the same material has 36cm base edges. How does each indicated measurement for the larger prism compare to the same measurement for the smaller prism? Find the volume and

*asked on September 29, 2013* -
## statistics

From experience, an airline knows that only 80% of the passengers booked for a certain flight actually show up. If 8 passengers are randomly selected, find the probability that fewer than 7 of them show up.

*asked on March 20, 2014* -
## Calculus

According to the US Census, the world population P, in billions, is approximately P=6.342e^(0.011t); where t is in years since January 1, 2004. At what rate was the world's population increasing on January 1, 2005? Give your answer in millions per year. Is

*asked on November 5, 2008* -
## Physics

A water bed that is 1.5 m wide and 2.5 m long weighs 1055 N. Assuming the entire lower surface of the bed is in contact with the floor, what is the pressure the bed exerts on the floor? (Round to the first decimal point and don't forget units.

*asked on December 19, 2011* -
## calculus inverted cone

A container in the shape of an inverted cone has radius 6 ft and height 12 ft. It is being drained at 2〖ft〗^3/min. Find the rate of change of the height of the liquid in the cone when the height is 3 feet. The ratio of the radius to the height remains

*asked on November 11, 2014* -
## Statistics

A maker of microwave ovens advertises that no more than 10% of its microwaves need repair during the first 5 years of use. In a random sample of 57 microwaves that are 5 years old, 13% needed repairs. At á=0.01, can you reject the maker’s claim that no

*asked on May 5, 2010* -
## earth science

Select all of the answers that apply. Some rules to remember when reading topographic maps are _____. 1)the elevations of contour lines must always be whole number multiples of the contour interval. 2)the thin line separating two different rock units is a

*asked on April 7, 2010* -
## math

The population of a colony of rabbits grows exponentially. The colony begins with 5 rabbits; 5 years later there are 310 rabbits. (a) Express the population of the colony of rabbits, P , as a function of time, t , in years. (b) Use the graph to estimate

*asked on March 13, 2018* -
## calculus

The surface area, S, of a sphere of radius r feet is S = S(r) = 4πr2. Find the instantaneous rate of change of the surface area with respect to the radius r at r = 2. (4 points)

*asked on January 16, 2015* -
## Physics Calculation

The weight of an apple near the surface of the earth is 1N. What is the weight of Earth in the gravitational field of the apple?

*asked on May 14, 2011* -
## Calculus

Show that f(x) = x^3 and g(x) = 200x^3 grow at the same rate.

*asked on May 4, 2018* -
## calculus

If f(x) = ι(x2 - 8)ι, how many numbers in the interval 0 ≤ x ≤ 2.5 satisfy the conclusion of the mean value theorem? (4 points) Three Two One None

*asked on January 16, 2015* -
## Chemistry

What is another name or diagram of 2-butene and hydroiodic acid. Any help would be greatly appreciated.

*asked on November 19, 2008* -
## Calculus

A train is heading due west from St. Louis. At noon, a plane flying horizontally due north at a fixed altitude of 4 miles passes directly over the train. When the train has traveled another mile, it is going 80 mph, and the plane has traveled another 5

*asked on November 12, 2008* -
## Math Word Problem

At 6am a few bacteria fall into a can of syrup in a broken garbage bag. The conditions of warmth, moisture, and food are perfect for growth and the population doubles every 20 minutes. By 6pm the bacteria are overcrowded and dry and their food is gone.At

*asked on November 9, 2008* -
## algebra

a ladder is placed 5ft away from a house. the ladder comes up to 12ft on the side of the house. how long is the ladder?

*asked on February 23, 2017* -
## Physics

A 5.36 kg object falls freely (ignore air resistance), after being dropped from rest. Determine the initial kinetic energy, the final kinetic energy, and the change in kinetic energy for the following. (a) first meter of fall initial kinetic energy 0 J

*asked on March 8, 2014* -
## Calculus

Hi, I missed school due to illness (and my school isn't very forgiving) so I would really appreciate some help answering these questions, tbh I have no idea how to do these (it was a short unit and I missed all of it) but If I just see how they are solved

*asked on March 18, 2019* -
## Global Studies

All of the following affect climate EXCEPT a. vegetation b. elevation c. location d. wind patterns

*asked on March 27, 2014* -
## math

Match the equation with the step needed to solve it. 1. 2m - 1 = 3m subtract m 2. 2m = 1 + m subtract 2 3. m - 1 = 2 subtract 1 4. 2 + m = 3 subtract 2m 5. -2 + m = 1 add 2 6. 3 = 1 + m add 1

*asked on January 14, 2010* -
## Geometry

On September 3, 1970 a hailstone with diameter 5.6in fell at Coffeyville, Kansas. It weighed about 0.018Ib/in^3 compared to the normal 0.033Ib/in^3 for ice. About how heavy was this Kansas hailstone?

*asked on September 27, 2013* -
## Geometry

Point Q is the midpoint of PS. Which of the following completes the statement

*asked on January 30, 2019* -
## accounting

Prepare general journal entries to record the following transactions for the Harris Company. (The company uses the balance sheet approach for recording bad debts expense.) 2010 Dec. 31 Recorded Bad Debts Expense, $800 2011 Jan. 3 Wrote off Jal’s account

*asked on September 10, 2018* -
## Chemistry

What is the complete redox reaction of KMnO4 against (NH4)2Fe(SO4)2

*asked on July 22, 2018* -
## English

What does this mean "the cold gleam of the fanatic" It is in the story "The Sniper" by Liam O'Flaherty

*asked on November 18, 2015* -
## Calculus

A dose, D, of a drug causes a temperature change, T, in apatient. For C a positive constant, t is given by T=((C/2)-(D/3))D^3. (a) What is the rate of change of temperature change with respect to dose. (b) For what dose does the temperature change increase

*asked on November 9, 2008* -
## Chemistry

A 50.0 mL sample of 0.23 M propanoic acid, CH3CH2COOH, a weak monoprotic acid, is titrated with 0.14 M KOH. Ka of CH3CH2COOH = 1.4 multiplied by 10-5. What is the pH at equivalence point?

*asked on April 3, 2011* -
## Math

You invest $500 at an annual interest rate of 6.75% compounded continuously. How long will it take y our money to double?

*asked on May 24, 2018* -
## calculus

A 15-ft ladder rests against a vertical wall. If the top of the ladder slides down the wall at a rate of 0.33 ft/sec, how fast, in ft/sec, is the bottom of the ladder sliding away from the wall, at the instant when the bottom of the ladder is 9 ft from the

*asked on January 17, 2015* -
## Chemistry

Butane,C4H10 , is a component of natural gas that is used as fuel for cigarette lighters.At 1.00atm and 23 degrees Celsius , how many liters of carbon dioxide are formed by the combustion of 1.00 of butane? 2C4H10+13O2 yields 8CO2+10H2o Any help would be

*asked on September 21, 2008* -
## Physics?

the total mass-energy of one pound of anything is about how many joules

*asked on January 31, 2013* -
## Chemistry

You have the alkane C7H17. What is the IUPAC name. I tried heptane and 4-ethyl-3-methylheptane, but it still says my answer is wrong. What would be the answer then.

*asked on November 15, 2008* -
## Physics

The average distance between Earth and the Sun is 1.5 ✕ 10^11 m. (a)Calculate the average speed of Earth in its orbit (assumed to be circular) in meters per second. (b)What is this speed in miles per hour?

*asked on August 28, 2018* -
## Calculus

I was worried the last response in: (jiskha.com/questions/1789039/Sorry-to-bother-you-so-much-but-do-you-think-you-could-check-my-answers-for-these) would get lost so I just re-posted it here just in case: Thank you so much for including both methods on 2C

*asked on March 20, 2019* -
## Calculus

Sorry to bother you so much but do you think you could check my answers for these two: jiskha.com/questions/1788952/Hi-I-missed-school-due-to-illness-and-my-school-isnt-very-forgiving-so-I-would

*asked on March 19, 2019* -
## Calculus

What is the local linearization of e^x^2 near x=1? Is the answer 1+2x

*asked on November 14, 2008* -
## physics

A hiker starts at his camp and moves the following distances while exploring his surroundings: 70.0m north, 2.75 x 10^2m east, 130m at an angle 30.0 degrees north of east, and 1.50 x 10^2m south. a.) find his resultant displacement from camp. (take east as

*asked on January 30, 2013* -
## adult education

Briefly describe the cookie production process. 2. What are two ways that the company has increased productivity? Why did increasing the length of the ovens result in a faster output? 3. Do you think that the company is making the right decision by not

*asked on November 8, 2010* -
## Physics

A child’s toy consists of plastic attached to a spring. The spring is compressed against the floor a distance of 1.48 cm, and the toy is released. The acceleration of gravity is 9.8 m/s2 . If the toy has a mass of 109 g and rises to a maximum height of

*asked on September 19, 2012* -
## Hard Calculus

A dose, D, of a drug causes a temperature change, T, in apatient. For C a positive constant, t is given by T=((C/2)-(D/3))D^3. (a) What is the rate of change of temperature change with respect to dose. (b) For what dose does the temperature change increase

*asked on November 9, 2008* -
## chem 12

consider the following equilibrium 2NOCl(g)--- 2 NO(g) + Cl2(g) Initally 1.00 mol of NO and 1.00 mol of Cl2 are placed in a 5.00L container. Calculate the initial concentrations of NOCl, NO and Cl2 NO= 0.20 mol/L Cl2= 0.20 mol/l NOCl=0 At equilibrium it is

*asked on March 8, 2016* -
## Calculus

A rectangular beam is cut from a cylindrical log of radius 30 cm. The strength of a beam of width w and height h is proportional to wh^2. Find the width and height of the beam of maximum strength. Is the width 45 and the height 20.

*asked on October 26, 2008* -
## Physics Help

A projectile is fired at an upward angle of 60 degrees with a speed of 100m/s. It lands on a plateau 150m higher. What is the projectile's speed the moment before it strikes the plateau? I'm thinking to just use the kinematic equation Vf^2= Vi^2 + 2aΔy.

*asked on December 13, 2015* -
## Math

Find the value of 21 - 18 ÷ 3 · 2. A)1 if it doesnt show A is 1 half - 2 B)2 C)9 D)18

*asked on January 7, 2010* -
## Physics

A penny rests on top of a bowling ball. You give the bowling ball a slight bump and the penny slides off the frictionless, spherical surface as shown below. At what angle θ does the penny leave the surface of the bowling ball? (Hint: When the penny leaves

*asked on March 8, 2014* -
## Physics

An unmarked police car traveling a constant 80 is passed by a speeder traveling 145 .Precisely 2.50 after the speeder passes, the police officer steps on the accelerator; if the police car's acceleration is 1.80 , how much time passes before the police car

*asked on October 4, 2011* -
## Chemisty

Alexander, who weighs 159 , decides to climb Mt. Krumpett, which is 5460 high. For his food supply, he decides to take nutrition bars. The label on the bars states that each 100- bar contains 10 of fat, 40 of protein, and 50 of carbohydrates.Alexander

*asked on September 27, 2008* -
## java programming

You need to provide more than a yes or no answer for this question. Consider both the selection sort and the bubble sort. If these algorithms will work with duplicates explain why they will still work. If they will not work, explain why they will not work.

*asked on July 29, 2006* -
## chem 12

1.0 mol of each of the gases, CO, H20, CO2 and H2 are placed in a 2.00L container and allowed to reach equilibrium. It is found at equilibrium 0.40 mol of CO is present. Calculate the value of K eq for the system. C0(g) + H20(g)--- CO2(g) + H2(g) Intial

*asked on March 13, 2016* -
## Physics

A small block slides along a track from one level to a higher level, by moving through an intermediate valley (see Figure). The track is frictionless until the block reaches the higher level. There a frictional force stops the block in a distance d. Assume

*asked on December 26, 2013* -
## Physics (angular motion)

The blades of a fan running at low speed turn at 230rpm . When the fan is switched to high speed, the rotation rate increases uniformly to 370rpm in 5.80s . Part A What is the magnitude of the angular acceleration of the blades? Part B How many revolutions

*asked on November 7, 2013* -
## Geometry

A 5 foot tall woman stands 15 ft from a statue. She must look up at an angle of 60° to see the top of the statue. How tall is the statue?

*asked on September 20, 2013* -
## chem12

for the equilibrium 2HI(g)--- H2(g) + I2 k eq = 8.0 2.0 mol of HI are placed in a 4.0 L container, and the system is allowed to reach equilibrium. Calculate the equilibrium concentration of all three gases. Inital 2HI 0.5mol/l H2 =0 I2=0 change 2HI= -2x

*asked on March 8, 2016* -
## Chemistry

Butane, , is a component of natural gas that is used as fuel for cigarette lighters.At 1.00 and 23 , how many liters of carbon dioxide are formed by the combustion of 1.00 of butane? 2C4H10+13O2 yields 8CO2+10H2o

*asked on September 21, 2008* -
## Calculus

(I know it looks like a lot but it's just 10 questions) (part 1 [It also explains my situation]: jiskha.com/questions/1788952/Hi-I-missed-school-due-to-illness-and-my-school-isnt-very-forgiving-so-I-would) (If your willing to do this part along with part

*asked on March 18, 2019* -
## Global Studies (Please help)

which of the following was neither part of the confederacy nor the union? a. Minnesota b. Texas c. Michigan D. Colorado

*asked on February 3, 2014* -
## Physics

A long jumper leaves the ground at an angle of 20 degrees and travels a horizontal distanceof 7.0m before landing. What is the takeoff speed of the jumper? To be honest I really don't know how to solve it. A step-by-step explantion would be helpful.

*asked on October 5, 2010* -
## physics

A 0.180 kg baseball, traveling 32.0 m/s, strikes the catcher's mitt, which recoils 13.0 cm in bringing the ball to rest. What was the average force (in newtons) applied by the ball to the mitt?

*asked on March 7, 2012* -
## Math

What is the expression for "the difference between five times a number and twice that number"? A)5(2 - N) B)5N - 2N C)2N - 5N

*asked on January 7, 2010* -
## Geography

The city of Urbania was designed by city planners to address the needs of both the city's businesses and its citizens. Single-family housing will be limited. Most people will live in multi-unit housing, such as apartments or condominiums. Businesses must

*asked on December 15, 2009* -
## Science

Broad areas of folded rock layers that resemble an upside-down bowl are called? a)domes b)basins c)horsts d)monoclines

*asked on December 7, 2009* -
## Calculus

A train is heading due west from St. Louis. At noon, a plane flying horizontally due north at a fixed altitude of 4 miles passes directly over the train. When the train has traveled another 5 miles and is going 500 mph. At that moment, how fast is the

*asked on November 11, 2008* -
## walter

A positive charge of 1.5x10^-8 C experiences a force of 0.025 N to the left in an electric field. What are the magnitude and direction of the field?

*asked on March 8, 2012* -
## Science

Where is this earthquake's epicenter? A)Tokyo, Japan B)Manila, Philippines C)Beijing, China D)Hong Kong, China

*asked on December 8, 2009* -
## Math

Describe the cross sections formed as the plane intersects the interior of the sphere but moves away from the center

*asked on March 15, 2017* -
## Physics

Lead spheres of masses 1.7 kg and 20.4 g whose centers are separated by 6.1 cm. Calculate the gravitational force between these spheres, treating each as a point mass located at the center of the sphere. The value of the universal gravitational constant is

*asked on February 9, 2016* -
## Chemistry

The Ka values of H3PO4 are shown below. Ka1 7.5 multiplied by 10-3 Ka2 6.2 multiplied by 10-8 Ka3 4.8 multiplied by 10-13 What is the pH of a 0.14 M solution of Na2HPO4?

*asked on April 3, 2011* -
## Physics

A 14.0 ohm resistor is made from a coil of copper wire whose total mass is 23.0 g. What is the diameter of the wire, and how long is it?

*asked on February 6, 2011* -
## Chemistry

What is another name ordiagram of 2-butene and hydroiodic acid. Any help would be greatly appreciated.

*asked on November 18, 2008* -
## Calculus

Consider the function f(x)=sin(1/x) Find a sequence of x-values that approach 0 such that (1) sin (1/x)=0 {Hint: Use the fact that sin(pi) = sin(2pi)=sin(3pi)=...=sin(npi)=0} (2) sin (1/x)=1 {Hint: Use the fact that sin(npi)/2)=1 if n= 1,5,9...} (3) sin

*asked on September 9, 2008* -
## Physics

Two point charges of +1.0 uC and -2.0 uC are located 0.50 m apart. What is the minimum amount of work needed to move the charges apart to double the distance between them? (k=8.99x10^9Nm^2/C^2)

*asked on February 12, 2015*