# How many litters of Oxygen will be required to burn 3.8 liters of propane, C3H8?

16,365 results, page 100
1. ## chemistry

Nitrogen dioxide abstracts with water vapor to produce oxygen and ammonia gas. If 12.8 grams of nitrogen dioxide reacts with 5.00 liter of water vapor at 375 degrees celisus and 725 tore, how many grams of ammonia can be produced? Use an ice table.

asked by sally on November 2, 2014
2. ## physics

При 0° С молекулы кислорода имеют среднюю скорость 460 м/с. Какова при этой температуре средняя скорость молекул азота? At 0 ° C, oxygen molecules have an

asked by lisa on May 29, 2011
3. ## Example of Carbon

Give an example in which carbon moves from the abiotic to the biotic part of an ecosystem. An example which shows that carbon moves from the abiotic to the biotic part of an ecosystem is it being in the atmosphere and getting removed by producers which

asked by Amanda on July 6, 2010
4. ## Physics

A 64.3 kg astronaut is on a space walk when the tether line to the shuttle breaks. The astronaut is able to throw a 10.0 kg oxygen tank in a direction away from the shuttle with a speed of 11.9 m/s, propelling the astronaut back to the shuttle. Assuming

asked by Kev on January 26, 2015
5. ## Physics (been trying all day)

A 62.6 kg astronaut is on a space walk when the tether line to the shuttle breaks. The astronaut is able to throw a 11.0 kg oxygen tank in a direction away from the shuttle with a speed of 13.3 m/s, propelling the astronaut back to the shuttle. Assuming

asked by bill on November 2, 2008
6. ## physics

A 61.3 kg astronaut is on a space walk when the tether line to the shuttle breaks. The astronaut is able to throw a 11.0 kg oxygen tank in a direction away from the shuttle with a speed of 10.6 m/s, propelling the astronaut back to the shuttle. Assuming

asked by joe on December 18, 2013
7. ## chemistry

I need a formula for: 0.5 grams of sodium chloride is dissolved to make 0.05 liters of solution. next 0.5 grams of sodium chloride is dissolved to make 0.05 ml of solution. next 670 grams of Pb (C2H3O2)4 are dissolved to make 3.5 ml of solution.

asked by venita on May 19, 2011
8. ## Chemistry

Sorry for posting this again, I don't know if the question was skipped or not, but I was just wondering if I could get some help on this... thanks. There are 3 known isotopes of Hydrogen and 3 stable isotopes of oxygen. How many types of water molecules

asked by Jessica on April 21, 2007
9. ## chem

what is a liquid solution and a gaseous solution? Do you intend to ask us to name a liquid solution and a gaseous solution. One example of a liquid solution is vinegar. It is acetic acid in water. That is a solution of two liquids. An example of a gaseous

asked by revie on May 14, 2007
10. ## Chemistry

Write a balanced formula equation with phase indicators: Strong heating of copper(II) nitrate trihydrate produces copper (II) oxide, nitrogen dioxide, oxygen gas, and water (The part I'm confused about is how to write the molecular formula for copper (II)

asked by Kyla on November 16, 2014
11. ## Chemistry

A typical fat in the body is glyceral trioleate, C57H104O6. When it is metabolized in the body, it combines with oxygen to produce carbon dioxide, water, and 3.022 x 10^4 kJ of heat per mole of fat. B)How many kilokoules of energy must be evolved in the

asked by Jayden on March 19, 2010
12. ## chemistry

if 37.9 liters of NO at .993atm and 146 degrees celcius are decomposed by the reaction 2NO-->N2+O2 how many grams of nitrogen will be formed... could you show mw step bu step how to do this ? thanks....i have finals tommorrow.... i need

asked by TIFFANY on January 10, 2007
13. ## chemistry

If boron hydride, B4H10, is treated with pure oxygen, it burns to give B2O3 and H2O. 2 B4H10(s) + 11 O2(g)  4 B2O3(s) + 10 H2O(g) If a 0.050-g sample of the boron hydride burns completely in O2, what will be the pressure of the gaseous water in a 4.25-L

asked by Jazmin on February 3, 2011
14. ## Habla Espanol?

Habla Espanol? si' Thank you for using the Jiskha Homework Help Forum. If you are asking that question correctly, note that the proper punctuation must be at the beginning of the sentence, the tilde is required over the ñ and the language is NOT

asked by Pablo on June 2, 2007
15. ## physics

Find the force (in newton) required to lift a mass of 26 kg load with a wheelbarrow (2nd class lever) with the load at 0.75 m from the fulcrum and being lifted at 1.7 m from the fulcrum, assuming ideal conditions.

asked by kody on November 17, 2014
16. ## PHYSICS!!!

A thin 1.8-mm coating of glycerine has been placed between two microscope slides of width 1.0 cm and length 4.0 cm. Find the force required to pull one of the microscope slides at a constant speed of 0.35 m/s relative to the other slide. Answer in N

asked by k on November 11, 2012
17. ## Chemistry

How many joules ar required to heat a frozen can of juice (360 grams) from -5 degrees C (the temp of an overcooled refrigerator) to 110 degrees C (the highest practical temp within a microwave oven)?

asked by Tom on January 5, 2013
18. ## AP physics

1000 kg car is going clockwise around a curve iwth radius of 30m. coefficient of frction=0.5 if the road was banded at an angle what would happen to the speed required or the radius of the curve? explain.

asked by Anthony on March 26, 2017
19. ## chemistry

sodium azide, decomposes according to the following equation: 2NaN3 (s) -> 2Na (s) + 3N2(g) What mass of sodium azide is required to provide nitrogen needen to inflate a 80.0 L bag to a pressure to 1.35 atm at 25 c?

asked by eveline on April 19, 2010
20. ## operating systems

Translate the following function (which is part of the body of a Monitor) using P and V operations to implement the ‘wait’ and ‘signal’ operations and the mutual exclusion as required by the definition of the Hoare monitor as discussed in chapter

asked by chirag on June 9, 2007
21. ## PHYSICS!!!

A thin 1.8-mm coating of glycerine has been placed between two microscope slides of width 1.0 cm and length 4.0 cm. Find the force required to pull one of the microscope slides at a constant speed of 0.35 m/s relative to the other slide. Answer in N

asked by k on November 11, 2012
22. ## physics

the speed of a transverse wave on a string is 450 m/s while the wavelength is .18m. the amplitude of the wave is 2mm how much time is required for a particle of the string to move through a total distance of 1km

asked by Tasha on April 25, 2010
23. ## Physics 1

a skier of mass 70.0kg is pulled up a slope by a motor-driven cable. How much work is required to pull the skier 60.0 m up a 35.0 degree slope (assumed to be frictionless) at a constant speed of 2.0m/s? The Value of g is 9.81 m/s^2?

asked by Brisa on January 2, 2017
24. ## physics

on turning a corner a motorcyclist rushing at 44 meter per second. find a child on the road 100m away. he applies the brake so as to stop motorcycle within 1m of the child. calculate the time required to stop?

asked by tuhituhi on June 11, 2013
25. ## finance

Should Collins liberalize credit if a 15 percent after-tax return on investment is required? Assume Collins also needs to increase its level of inventory to support new sales and that inventory turnover is four times.

asked by Anonymous on August 10, 2010
26. ## Calculus

A chain 27 feet long whose weight is 74 pounds is hanging over the edge of a tall building and does not touch the ground. How much work is required to lift the entire chain to the top of the building?

asked by Allison on February 11, 2011
27. ## PHYSICS

Assuming an object at infinity, a person has far points of 5.2 m from the right eye and 6.2 m from the left eye. Describe the lens required (diopters) as seen in a prescription for the refractive power of each corrective contact lens.

asked by Orla on April 6, 2016
28. ## physics

A 600-pound boat sits on a ramp inclined at 30 degrees as shown in the attached image. What force is required to keep the boat from rolling down the ramp? Completely lost, never done physics before....

asked by Eoin on October 8, 2014
29. ## Physics

A 149 kg crate is pushed at constant speed up a frictionless inclined plane of $\theta$ = 51 $^{\circ}$ with the horizontal. Assuming one pushes with a horizontal force, what is the magnitude of the force F (in N) required to do this?

asked by JAYZ on October 14, 2013
30. ## Physics

A ski rope operates on a 15° slope of length 65.0 m. The rope moves at 9.7 km/h and provides power for 40.0 riders at one time, with an average mass per rider of 70 kg. Estimate the power required to operate the tow

asked by Anonymous on December 2, 2015
31. ## devryu

4. What would happen with the price you computed above if AirJet Best Parts, Inc. announces that dividends at the end of the year will increase? What if the required rate of return increases? What changes in dividends will affect the stock price and how?

asked by cornell w. on June 24, 2012
32. ## Chemistry

My brain refuses to wrap around titration. Problem: Given 150.0 mL of a 1.05 M HCl solution, how many milliliters of a 2.50 M Al(OH)3 solution are required to neutralize the HCl? I think the balanced formula is 3HCl + Al(OH)3 - AlCl +3H20 but that's as far

asked by Wolfmaid on December 7, 2009
33. ## Stats

2) Find the minimum sample size that should be chosen to assure that the proportion estimate p will be within the required margin of error, .06. Use a 95% confidence interval and a population proportion of .7. The critical value for a 95% confidence level

asked by Eric on June 14, 2011
34. ## Chemistry

The Ka for hydroflouric acid is 4.5 *10^-4 at 298K. Calculate the amount of sold NaF that is required toprepare a 250. mL acidic buffer with pH = 2.75. The inital molarity of hydroflouric acid is .250M but you have only 75mL.

asked by Jake on April 7, 2011
35. ## Physics

A 66.2 kg person sits on the 5.3 kg sled (slope is on an angle, angle not given). It is to be pulled across the snow with a coefficient of friction equal to 0.12. What horizontal force is required to pill the sled at a constant speed?

asked by M on June 16, 2014
36. ## phys

male erection is an example of __________. no thought or emotion is required for it to occur, but conscious control can influence it. a. peripheral nerves b. sensory nerves c. a spinal reflex d. a sexual reflex

asked by mike/meka on August 13, 2013
37. ## pen state university

A fan blade, initially at rest, rotates with a constant acceleration of 0.025 rad/s 2 . What is the tim e interval required for it to reach a 4. 2-rad displacem ent after starting from rest?

asked by steve lucas on November 3, 2013
38. ## physics

A steam boiler is made of steel and weighs 900lb. The boiler contains 400lb of water. How many Btu are required to raise the temperature of each from 42fahrenheit to 212fahrenheit? specific heat of steel = 0.11

asked by bits on September 28, 2016
39. ## CHEMISTRY

A second-order reaction has a rate constant of 1.65 M–1 s–1. If the initial reactant concentration is 1.0 M, calculate the time (in seconds) required for the reaction to become 90% complete. i got 0.06734 seconds but that's incorrect i have no idea

asked by Maya on March 28, 2012
40. ## medical billing and coding

How will employees in the medical office have to be trainrd regarding privacy(for example, who is responsible for training and record keeping)? What is required if an employee doesn't follow the privacy policy? When must employees be trained? In what

asked by betty on June 15, 2009
41. ## Chemistry

An aqueous stock solution is 85.0% H2SO4 by mass and its density is 1.83 g/mL. What volume of this solution is required to make 1.00 L of 1.35 mol/L H2SO4(aq)? Give your answer in millilitres, accurate to three significant figures.

asked by Wes on September 30, 2014
42. ## Medical Billing and Coding

How will employees in the medical office have to be trained regarding privacy (who is responsible for training and record keeping)? What is required if an employe doesn't follow the privacy policy? When must employees be trainedand in what manner?

asked by Deb on November 11, 2008
43. ## Statistics

Find the minimum sample size that should be chosen to assure that the proportion estimate p will be within the required margin of error, .06. Use a 95% confidence interval and a population proportion of .7. The critical value for a 95% confidence level is

asked by Eric on June 6, 2011
44. ## Chem (Specific Heat)

I am confused as to how to solve this problem. Can someone please tell me the steps? I know SH = heat/ mass x change in temp. What is the specific heat of a metal if 7.74 × 103 J of energy is required to warm a 75.0 g sample of the metal from 10 °C to

asked by mysterychicken on February 6, 2014
45. ## physics

a rope attarched to a sledge make an angle of 40 degree with the ground calculate the tension in the rope required to produce a horizontal component of 100N what will be the vertical component of this forces?

asked by Anonymous on October 17, 2018
46. ## physics

A satellite circling the earth has an average power consumption of 370.0 W. Assuming 5.4% efficiency for conversion of solar energy to electrical energy, what area is required for the solar panels?

asked by lyla on March 16, 2011
47. ## chemistry step by step for thank a lot

10L of hard water required 5.6g of lime for removing hardness. Hence temporary hardness in ppm of caco3. The answer 1000 who helps me to solve it for me step by step thank a lot

asked by ken on July 6, 2014
48. ## Chemistry

The electrolysis of 250ml of a brine solution was carried out for a period of 20mins with a current of 2A. The resulting solution was titrated with 0.62M HCL. How many ml of HCL would be required to achieve natural point

asked by Shilpa saxena on May 19, 2017
49. ## chem

What amperage is required to plate out 0.315 mol Cr from a Cr3+ solution in a period of 9.00 hr? im writing the conversions and i started with 9hr -> seconds but where do i go from the seconds to the moles of Cr? i know that we have to use for every mole

asked by Sara on May 13, 2011
50. ## math

6a^2+4a+5+3a^2+7a-2 That is the same thing as 9a^2+11a+3, but what is the question? You have just written an algebraic expression, not an equation to be solved. assuming you are required to factorise the equation and the expression give by drwls it

asked by chucke on January 26, 2007
51. ## math

the new playground at middeldae school will be enclosed by a fence. The playgroundnd will be rectangualar and will have an area of 225 yd. The number of yards on each side will be a whole number. What is the least amount of fencing that could be required

asked by Anonymous on March 25, 2013
52. ## Chemistry

How much energy (in kilojoules) is required to convert 280mL of diethyl ether at its boiling point from liquid to vapor if its density is 0.7138 g/mL? Its heat of vaporization is +26.5 kJ/mol at its boiling point.

asked by Julie on February 16, 2010

a stock is expected to pay a dividend of $0.50 the end of the yeat and it should continue to grow at a constant rate of 5% a year. If the required return is 14% what is the stock expected price 5 years from today asked by Tracy on November 11, 2010 54. ## chemistry 25cm3 of a solution of NaOH required 28cm3 of 1.0mol/dm3 H2SO4 to neutralise it: a) write an equation for the reaction. b) how many molesof H2SO4 were needed? c) how many moles of NaOH were thus nuetralised? asked by tinashe on March 1, 2017 55. ## Physics Question......many thanks A projectile is shot directly away from Earth's surface. Neglect the rotation of Earth. (a) As a multiple of Earth's radius RE, what is the radial distance a projectile reaches if its initial speed is one-fifth of the escape speed from Earth? ____ times RE asked by Jessy on January 15, 2007 56. ## chemistry I am required to give two examples of atoms/molecules from tocanide that can bind itself to receptor sites in the body via hydrogen bonding and the reasons for this. I have read through the text book and have been unable to extract this information,. asked by layla on March 7, 2007 57. ## chemistry A 12.0g sample of carbohydrate contain 4.50g of carbon, 3.25g of oxygen, and some hydrogen. Determine the percent by mass of hydrogen in your product. Find the empirical formula for a compound that consists of aluminum and chlorine in which the aluminum is asked by jhong on March 13, 2012 58. ## Chem-organic, bio, intro A gas mixture contains oxygen and argon at partial pressures of 0.60 atm and 425 mmhg. If nitrogen gas added to the sample increases the total pressure to 1250 torr, what is the partial pressure in Torr of the Nitrogen added? Steps for solving this problem asked by Ashleigh on October 16, 2011 59. ## college Chemistry Why was there condensation of the beaker of cold water when a blue flame was passes underneath? This experiment is from the Gas Burner experiment. A) the product of carbon dioxide from combustion (B) the product of hydrogen dioxide from combustion (C) left asked by Ivy on December 5, 2010 60. ## chemistry a) Calculate the number of moles of nitrogen dioxide, NO2, that could be prepared from 79.0 mol of nitrogen oxide and 82.0 mol of oxygen. 2NO(g)+O2(g)⟶ 2NO2(g) b) Identify the limiting reagent and the excess reagent in the reaction. What would happen to asked by Will on August 24, 2014 61. ## physics A 89 kg solid sphere with a 12 cm radius is suspended by a vertical wire. A torque of 0.37 N·m is required to rotate the sphere through an angle of 0.93 rad and then maintain that orientation. What is the period of the oscillations that result when the asked by kendell on January 9, 2011 62. ## Finance A7X Corp. just paid a dividend of$1.90 per share. The dividends are expected to grow at 22 percent for the next eight years and then level off to a growth rate of 6 percent indefinitely. If the required return is 13 percent, what is the price of the stock

asked by Kymesha White on July 12, 2017
63. ## Math

An indoor running track has the dimensions shown. The ends of the track are semicircles. If the track is to be resurfaced, how many square feet of material will be required? The semicircle is listed at 34 ft., the straightaway at 80 ft., and individual

asked by SC on May 9, 2012
64. ## Science

How much heat energy is required to raise the temperature of 5Kilograms of a coal from 20 C to 220 C ? Coal? Doesnt coal decompose before 220C> 1,314,718 j is the correct answer to this question, I just finished a test with that same qustion on it.

asked by Janice on July 31, 2005
65. ## chemistry

For corrosion resistance, a steel bolt is plated with nickel from a solution of nickel(II)sulfate. If 0.250 g of nickel produces a plating of the required thickness and a current of 0.540 A is used, predict how long in minutes the process will take

asked by Alex on April 20, 2008
66. ## Physics

A car accelerates uniformly from rest to 21.0 m/s in 6.1 s along a level stretch of road. Ignoring friction, determine the average power required to accelerate the car if the weight of the car is the following. A) 8.0e3N B) 1.2e4N (The answer needs to be

asked by Natasha on March 12, 2012
67. ## engineering

The flow system as shown in the Figure, the centrifugal pump(3500 R.P.M.) is delivering water at 100 gal/min and 70 °F into a boiler operating at a pressure of 35 psig. The water levels in the feed tank and boiler are constant. Because corrosion is

asked by sun.life on December 18, 2013
68. ## chemistry

each time you breath in, you take in 500 ml of air. the air you breath in is about 20% oxygen by volume. you breath roughly 8 times per minute when you sleep and lets assume you sleep for 8 hours in a night. given this information, how much mass would you

asked by Anonymous on September 30, 2010
69. ## Chemistry

a chemist wanted to make 100 grams of SO2. She had only 12 grams of sulfur and 4 grams of oxygen. Unfortunately, the amounts of reactants were not enough to make the desired product. How much S and O2 would she need in order to obtain the desired grams of

asked by jermain on November 3, 2011
70. ## CHEM

Hydrogen peroxide (H2O2) is decomposed according to the following reaction: 2H2O2 (l) ¡÷ 2H2O (l) + O2 (g) If 6.00 g of aquesous solution containing hydrogen peroxide was decomposed after heating, the mass of oxygen gas collected is 2.40 g, what is the

asked by CHAN on December 30, 2014
71. ## URGENT Chemistry question

a chemist wanted to make 100 grams of SO2. She had only 12 grams of sulfur and 4 grams of oxygen. Unfortunately, the amounts of reactants were not enough to make the desired product. How much S and O2 would she need in order to obtain the desired grams of

asked by jermain on November 3, 2011
72. ## Chemistry

There is a question on my assignment that's asks how many moles of atoms are in x mol of CO2 (and a few others). Let X represent 5x10^-4. How do I do this? Teacher didn't really teach us this. I know in one mol of CO2 there is 2 moles of oxygen atoms, so

asked by Logan on October 13, 2015
73. ## Chemistry

Magnesium oxide can be made by heating magnesium metal in the presence of oxygen. The balanced equation for the reaction is: 2Mg(s)+O2(g)→2MgO(s) When 10.1 g of Mg are allowed to react with 10.5 g of O2, 14.5 g of MgO are collected. a) Determine the

asked by Beth on October 19, 2016
74. ## Chemistry honors

20 grams magnesium metal react with excess oxygen and 28 grams of magnesium oxide are produced in lab what is percent yield? If 99.8 g of aluminum nitrate are reacted with excess sulfuric acid what would be the theoretical yield in grams of aluminum

asked by lynn on December 4, 2014
75. ## Chemistry

I got 0.907 KJ for ΔHcomb but I don't know if its correct. I also don't know how to write the equation. -------- question: A calorimeter is filled with 10.0 mole of methane gas and an excess of oxygen. When burned, the ignition wire releases 107.2 J of

asked by Liz on July 16, 2014
76. ## Chemistry

Here's a molar heat problem I just have one question on. How much heat will be transferred if 2 moles of hydrogen reacts with excess oxygen according to the reaction below? 2H2 + O2 yields 2H20 + 572 kJ The answer according to my answer key is 2 mole H2 x

asked by Tabetha on May 18, 2009
77. ## chemistry

Water softeners often replace calcium ions in hard water with sodium ions. Since sodium compounds are soluble, the presence of sodium ions in water does not cause the white, scaly residues caused by calcium ions. However, calcium is more beneficial to

asked by M on January 25, 2010
78. ## biology

1. Enzyme competition occurs when: A. one type of enzyme reacts with one type of substrate. B. an enzyme does not react with a substrate. C. three different types of enzymes react with one type of substrate. D. an enzyme stops a reaction. is it C 2. The

asked by Amy on July 13, 2013
79. ## chemistry

a resting person requires 14.5 L of O2 per hour to maintain metabolic activities. Such a person breathes in 0.50 L of air at approximately 20 degrees C with each breath. The inhaled air is 20.9%O2 while the exhaled air is 16.3% O2. (a) how many breaths per

asked by Joe on November 19, 2009
80. ## Physical Science

1) Carbon dioxide is obtain from the air and changed into carbohydrates oxygen during the process of fossilization. respiration. digestion. photosynthesis. 2) Which sequence of processes must occur for an atom of carbon to go from car to tree? respiration,

asked by Amber on January 22, 2014
81. ## chemistry check

please check Write the balanced equation, with the enthalpy component, for the rusting process, given that Hf for iron and oxygen is 0 and Hf for ferric oxide is -826 kJ/mol. 4 Fe (s) + 3 O2 (g) --------> 2 Fe2O3 (s) You need to add the heat one of three

asked by key on February 8, 2007
82. ## Chem

Mg + O2 ------> MgO if 1.00 g of magnesium is ignited in a flask containing 0.500liters of oxygen at STP, how many grams of magnesium oxide areproduced? what is the name and the amount of the reactant inexcess? My work: 1g Mg/24.3g=0.041 mol Mg; 0.5L

asked by Lisa on December 30, 2014
83. ## math

Chalk contains calcium,carbon and oxygen in the ratio 10:3:12.Find the percentage of carbon in a chalk and in a stick of chalk, carbon in 3g what is the length of chalk stick?

asked by Ashish on October 3, 2016

Acetylene gas (C2H2) is used in welding. During one job, a welder burns 48.0 g of acetylene. Using a balanced equation for the complete combustion of acetylene, calculate the following: What is the balanced equation. The mass of oxygen used? The mass of

asked by MINNIE on December 6, 2014
85. ## chemysteryyy!!!!

Rubbing Alchol often contains propanol, C3H7OH. Suppose that you have an 85.9g sample of propanol. a) Howmany carbon atoms are in the sample? b) Howmany hydrogen atoms are in the sample? C)Howmany oxygen atoms are in the sample? PLEASE!! explain the steps

asked by Kristy on December 26, 2012
86. ## chem

How many moles of potassium iodide, KI, are required to precipitate all of the lead(II) ion from 25.0 mL of a 1.6 M Pb(NO3)2 solution? A. 0.020 mol B. 0.040 mol C. 0.080 mol D. 0.64 mol E. 64 mol

asked by victoria on April 28, 2013
87. ## CHEMISTRY

The extracellular concentrations of Na+ and K+ are 135mM and 6mM, respectively. The intracellular concentrations of Na+ and K+ are 10mM and 105mM, respectively. The membrane potential is 75mV. For Na+/K+ ATPase, 3Na+ are exported and 2K+ are imported.

asked by Izabella on September 26, 2013
88. ## Chemistry

The extracellular concentrations of Na+ and K+ are 135mM and 6mM, respectively. The intracellular concentrations of Na+ and K+ are 10mM and 105mM, respectively. The membrane potential is 75mV. For Na+/K+ ATPase, 3Na+ are exported and 2K+ are imported.

asked by Kam on September 29, 2013
89. ## MATH 12U

Mary leaves a dock paddling her canoe at 3m/s. She heads downstreamat an angle of 30 degrees to the current which is flowing at 4 m/s. a) How far downstream does Mary travel in 10s? b) What is the length of time required to cross the river ifits width is

asked by Kevinn on February 24, 2011
90. ## physics

If the ultimate shear strength of steel is taken to be 2.00 109 Pa, what force is required to punch through a steel plate 1.60 cm thick? Assume the superhero's fist has cross-sectional area of 1.20 102 cm2 and is approximately circular. answer in Newtons

asked by john on November 6, 2010
91. ## Chemistry

The extracellular concentrations of Na+ and K+ are 135mM and 6mM, respectively. The intracellular concentrations of Na+ and K+ are 10mM and 105mM, respectively. The membrane potential is 75mV. For Na+/K+ ATPase, 3Na+ are exported and 2K+ are imported.

asked by Drew on September 29, 2013
92. ## world history

How did food surpluses change the way of life in early human settlements? A-villages needed to organize governments B-the population decreased C-more hunting and gathering was required D-humans needed fewer tools and possesions my best answer is A is that

asked by Cassandra on August 11, 2017
93. ## Chemistry

Calculate amount of solid NaF required to prepare a 250mL acidic buffer with pH=2.75. The initial molarity of HF is .25M but you only have .075L of it. I have tried many different ways... the most recent and seems to be simplest was using H-H equaion and

asked by John on April 6, 2011
94. ## physics help!

A wire of 62cm length and mass 13g is suspended by a pair of flexible leads in a magnetic field of 0.44T. What are the magnitude and direction of the current required to remove the tension in the supporting leads? Please also scroll down because I also

asked by angy on May 31, 2016
95. ## chemistry

calculate the volume of 0.0321M NaOH that will be required to neutralize 25.00 mL of a 0.0399M hydrochloric acid solution. M1v1=m2v2 since were trying to find out the volume I would change the equation to m2 times V2 divided by M1 0.0399 X 0.025/0.0321

asked by elizabeth on November 2, 2014
96. ## Social Studies

How are the governments in Brazil and the United States similar? A. Voting is required by law.++ B. A president heads the executive branch. C. Each political party selects a presidential candidate before the election. D. The judicial branch appoints

asked by dori on December 17, 2018
97. ## FLUID MECHANICS

Air at 45°C is flowing steadily in a 25 cm-diameter horizontal pipe made of plastic at a rate of 900 l/min. Determine the head loss, and the required pumping power input for flow over a 175m-long section of the pipe.

asked by ANNA on May 3, 2014
98. ## Criminal Justice

Create a checklist that may be provided to the officers involved in the operation so they may have a reference reminding them of what they must do to properly process a defendant in a federal investigation. The checklist should include processing

asked by Luke Phillips on November 1, 2007
99. ## Calc

So the q is; You need to enclose a rectangular field with area 9600m^2, then divide the field into 2 sections. Whats the minimal amount of fencing required to accomplish this. So i have 3x+2y, and 9600=xy. i TRIED ISOLATING the second formula and plugging

asked by Labub on March 16, 2018
100. ## Biology

In hopes that this will actually get answered-- Match the terms with the appropriate descriptions. Digestive Excretory Skeletal Circulatory Nervous Respiratory Reproductive _______________________ A. coordinate body activities B. Removal of waste

asked by mysterychicken on March 5, 2010