# kris

Newest questions and responses by kris-
## Physics

Elastic behavior: when loads are small how much deformation occurs? What materials deform least?

*asked on October 3, 2018* -
## Science

A pulley system shows is use to raise a load of 600N through 8m. If the effiency I 90%. Calculate a, machincal advantage b. Workdone by the effort c. Effort applied

*asked on June 24, 2018* -
## math

carlos makes geometrical artworks out of sheet metal. the dimensions of a full size sculpture will be 6 times the dimensions of the model shown below. He will not use any metal for the bottom base of the cylinder. How many square feet of sheet metal will

*asked on April 24, 2018* -
## Math

The only way to get to Ship Island is to take a boat, which is free for 2 and under, $17 for children 3 to 10 years old, $25 for seniors 62 and over and $25 for everyone else. Debbie paid $116 for 6 people in her family to go to the island for the day. Is

*asked on January 21, 2018* -
## Math

A tiling company specializes in multi-colour tile patterns. A small hotel is interested in the patterns below for its square shaped reception area. How many dark coloured tiles will there be if the reception area needs an area of 18 x 18.

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

In a friendly neighborhood squirt gun contest a participant runs at 7.8 m/s horizontally off the back deck and fires her squirt gun in the plane of her motion but 45' above horizontal. The gun can shoot water at 11 m/s relative to the barrel, and she fires

*asked on October 9, 2017* -
## Math

A computer is purchased at 2000$. After each year, the resale value decreases by 25%. What will the resale value be after 3 years?

*asked on May 8, 2017* -
## Algebra II

(3-4yi)(6+7i)-[(2-3yi)-3(1+7i)] Express it in a+bi form I got 19+42i-21yi+28y but I do not know how to express it in a+bi form, can you please help me with it?

*asked on October 31, 2016* -
## Physics

A student says a speed of 50 m/s is faster than a speed of 140 km/h because the number is bigger. what would you say to them?

*asked on September 5, 2016* -
## Stoichiometry

What mass of water is produced from 10g of sulfuric acid ?

*asked on July 1, 2016* -
## math

A runner has a stride length of 5 feet for the first half of the race and a stride length of 4.5 feet for the second half. How many strides would it take to finish the second half of the marathon? Hint: 5 ft is 5.0 x 10 4.5 is 4.5 10

*asked on May 5, 2016* -
## Math

A bus travels 400 Miles in 8 hours how many miles will the bus travel in 2 days

*asked on March 26, 2016* -
## Math

A bus travels 400 Miles in 8 hours how many miles will the bus travel in 2 days

*asked on March 23, 2016* -
## Math

A bus travels 400 Miles in 8 hours how many miles will the bus travel in 2 days

*asked on March 22, 2016* -
## chemistry

What is the conjugate acid for NH2- ? N3- NH2- NH4+ H+ I thought it was NH4+ but it was wrong. Isn't it suppose to be NH3+ but they don't have on this choices.

*asked on October 4, 2015* -
## Chem

Can you check to see if I'm correct? Which of these substances are elements? a. silicone b. quartz c. iodine d. water e. silicon f. lead is the answer: c, e, and f?

*asked on September 10, 2015* -
## Chemistry

Hi! I am having some trouble with this question, can you please help me? Which of the following describe chemical properties? Check all that apply. - Iodine (a purple solid) becomes a purple gas. - Titanium is less dense that iron . - Water freezes at 0'C

*asked on September 10, 2015* -
## engineering math

What is the increase in temperature necessary for a hydrogen gas, initially at 0°C, to increase its volume by 5% at constant pressure?

*asked on August 9, 2015* -
## academic excellence

ms. sue the questions I need help with you answered o Jan 27, 2015 can you help me with the same questions? there are 20 of them. I saw them online.

*asked on May 27, 2015* -
## Math - Help Me Please

Stereo Inc. sells a stereo system for $300 down and monthly payments of $40 for the next 2 years. If the interest rate is 3.25% per month, find: a) The cost of the stereo. b) The total amount of interest paid. I am having trouble figuring out the correct

*asked on April 3, 2015* -
## math- please help me

Stereo Inc. sells a stereo system for $300 down and monthly payments of $40 for the next 2 years. If the interest rate is 3.25% per month, find: a) The cost of the stereo. b) The total amount of interest paid. I am having trouble figuring out the correct

*asked on April 3, 2015* -
## Math - Help Please

Stereo Inc. sells a stereo system for $300 down and monthly payments of $40 for the next 2 years. If the interest rate is 3.25% per month, find: a) The cost of the stereo. b) The total amount of interest paid. I am having trouble figuring out the correct

*asked on April 3, 2015* -
## science

Calculate the concentration of all species in a 0.145M solution of H2CO3

*asked on March 18, 2015* -
## Chemistry

Oil and water don't mix. We say that oil is

*asked on March 14, 2015* -
## Chemistry

Name three properties of metal for which metallic bonds are responsible

*asked on March 5, 2015* -
## math

3000 for 3 years at 1.8% compounded monthly

*asked on March 3, 2015* -
## 3rd grade math

mrs. lens wants to put a ribbon around the edge of a pillow. which tool and unit should she use to measure the perimeter of the pillow? measuring tape or ruler or yard stick?

*asked on February 18, 2015* -
## Calculus II

Find the indefinite integral. ∫xe^-4xdx

*asked on February 4, 2015* -
## Science

A sample of steam with a mass of 0.530g and at a temperature of 100 ∘C condenses into an insulated container holding 4.40g of water at 5.0∘C.( ΔH∘vap=40.7 kJ/mol, Cwater=4.18 J/g⋅∘C). What is the final temperature of the mixture, assuming no

*asked on January 20, 2015* -
## maths

I am fraction they say i m nt proper i may be improper but when u solve me u get number seven my number is 21.wht fraction am i?

*asked on December 25, 2014* -
## physics

A helicopter flies south at 185km/hr relative to the ground. The wind is blowing 60km/hr to the west compared to the ground. What is the helicopter's speed to an observer on the ground?

*asked on December 12, 2014* -
## Math

Ken planted 8 flowers and 4 shrubs in his mother's garden. He ran out of fertilizer before he planted 2 of the flowers and 1 of the shrubs, so he planted them without fertilizer. What percentage of plants were planted without fertilizer? A. 12.5% B.25% C.

*asked on December 11, 2014* -
## physics

A student fires a rocket at 24 degrees above the horizontal. The 10kg rocket comes out of the gun barrel at 1000 m/s, and accelerates 15 m/s^2 uniformly until it burns out 2 seconds later. It then is acted apon by gravity until it hits the ground. I need

*asked on November 21, 2014* -
## Chemistry (urgent)

1.Using Nerst, find the E of the cell for the dicromate redox system: A.under standard conditions. B.under neutral solutions instead of acid solutions. 2.Use Nerst and the hydrogen half equation to obtain an expression for pH.

*asked on October 30, 2014* -
## Chemistry

1.Using Nerst, find the E of the cell for the dicromate redox system: A.under standard conditions. B.under neutral solutions instead of acid solutions. 2.Use Nerst and the hydrogen half equation to obtain an expression for pH.

*asked on October 29, 2014* -
## math

How many packs of DVDs can you buy with 198 dollars if one pack costs 18 dollars

*asked on October 24, 2014* -
## Chemistry (urgent)

Hydrolysis of a compound A, C7H6cl2 was carried out by refluxing with excess potassium hydroxide solution. the resulting solution was acidified with dilute HNO3 acid and excess silver nitrate was added to precipitate the chloride ions as silver chloride.

*asked on October 24, 2014* -
## algebra

This isosceles triangle has two sides of equal length, a, that are longer than the length of the base, b. The perimeter of the triangle is 15.7 centimeters. The equation 2a + b = 15.7 can be used to find the side lengths. If one of the longer sides is 6.3

*asked on October 13, 2014* -
## sixth grade math

3 3/5 * 5/6 = 90/45 Do I have correct answer?

*asked on September 25, 2014* -
## sixth grade math

Multiply. Write each product in simplest form. 1. 2 3/8 * 1 3/5 = 3 4/5 2. 1 5/6 * 2/3 = 11/10 3. 7/8 * 3 1/3 = 35/27 Do I have the correct answers? If not can someone show how to solve them?

*asked on September 18, 2014* -
## sixth grade math

Multiply. Write each product in simplest form. 1. 2 3/8 * 1 3/5 = 3 4/5 2. 1 1/5 * 3/5 = 18/25 3. 1 5/6 * 2/3 = 11/10 Do I have the correct answers? If not can someone show me how to solve them?

*asked on September 18, 2014* -
## Math

What is the sum of all the positive numbers smaller than 100,000 where all digits can only be 1 or 0.

*asked on September 11, 2014* -
## chemistry 12

a chemical reaction released 50.0kJ of energy as it heated a sample of water from 17.0 degrees celsius to 75.0 degrees Celsius, what mass of water was heated? I have no clue as to how to do this! can anyone help?

*asked on September 4, 2014* -
## chemistry

How many grams of glycolic acid are needed to react with 30 mL of 0.1 M NaOH?

*asked on July 2, 2014* -
## math

is 100 over 1000 10%?

*asked on April 27, 2014* -
## Math

Solve: -23m-(-35m)= -48

*asked on March 11, 2014* -
## math

Justin is 10 years less than half his father's age. If Justin is 12 years old, how old is his father?

*asked on March 6, 2014* -
## Calc Help :(((((

Solve it step by step so I can't do the rest. lim x->-infinity (ax^2+b)/(cx+d) Thank you! Answer th

*asked on February 23, 2014* -
## Calc Help :(((((

Solve it step by step so I can't do the rest. lim x->-infinity (ax^2+b)/(cx+d) Thank you!

*asked on February 23, 2014* -
## statistics

Use a table of t-values to estimate the P-value for the specified one-mean t-test. Left-tailed test, n=12, t= -3.412. a=p0.005. c= 0.005

*asked on February 22, 2014* -
## Angle of elevation

A rocket fired straight up is tracked by an observer on the ground a mile away. a)Show that when the angle of elevation is theta, the height of the rocket in feet is h=5280tan(theta).

*asked on February 6, 2014* -
## Angle of elevation

John stands at 12 feet from the foot of a tree. The angle of elevation to the top of the tree is 60°. What is the height of the tree?

*asked on February 5, 2014* -
## health

What physical symptoms often accompany social phobia? A. Difficulty talking B. Trembling C. Nausea D. All of the above

*asked on December 27, 2013* -
## Math

What is the number of different squares which can be inscribed in a given equilateral triangle?

*asked on December 13, 2013* -
## math

A recipe for cooking a turkey states to allow 15 minutes for each pound of turkey and to add 5 minutes per pound if the turkey is stuffed. Our turkey weights 18 pounds and will be stuffed. It takes half an hour for the turkey to cool. What time should the

*asked on December 1, 2013* -
## economics

What is the opportunuity cost if you make 15 a hour but you decide not to work for a 1 hour and go to the movie which cost 10 what is the opportunity cost?

*asked on November 3, 2013* -
## chem

A 1L flask is filled with 1.25 g of argon at 25 degrees celcium. A sample of ethane vapor is added to the same flask until the total pressure is 1.45 atm. What is the partial pressure of argon in the flask? Chemistry - DrBob222, Tuesday, October 5, 2010 at

*asked on October 24, 2013* -
## Calculus

(cos πx + sin πy)4 = 54; Implicit Differentation

*asked on October 10, 2013* -
## Math

Casper bought some pencils at $.50 each. He had $3 left after the purchase. If he wanted to buy the same number of note pads at $.80 each, he would be short $1.50. Write a linear equation for the number of pencils he purchased. Then solve it.

*asked on October 1, 2013* -
## math

a local summer baseball team plays 20 games each season. so far, they have won 9 games and lost 2. how many more games must they play win this season to win at least 75% of all their games?

*asked on September 21, 2013* -
## Chemistry help please

How many milligram of lysozyme (MW=14,600 g/mol) are needed to make 3 liters of a 10^-6 M solution?

*asked on September 16, 2013* -
## Chemistry help needed

How many milligram of lysozyme (MW=14,600 g/mol) are needed to make 3 liters of a 10^-6 M solution?

*asked on September 15, 2013* -
## Chemistry

How many milligram of lysozyme (MW=14,600 g/mol) are needed to make 3 liters of a 10^-6 M solution?

*asked on September 15, 2013* -
## Chemistry

How man moles of sodium phosphate are there in 0.4 liters of 0.1M Na2HPO4 (MW=141.96 g/mol)? 2.) How many millimoles in 200 ml?

*asked on September 15, 2013* -
## Physics

I am confused, selenium Se, is on the periodic table, but does it combine with other elements on the periodic table? I want to say no because it is a gas. Is that correct.

*asked on August 29, 2013* -
## math - geometry

Austin wants to sketch the graph of a circle represented by the given equation. (x - 4)2 + (y + 7)2 = 64 Using complete sentences, describe the steps used to sketch the circle on a coordinate grid

*asked on August 20, 2013* -
## ap chemistry

BaO2(s) + 2 HCl(aq) H2O2(aq) + BaCl2(aq) What amount of hydrogen peroxide should result when 1.00 g of barium peroxide is treated with 15 mL of hydrochloric acid solution containing 0.0330 g of HCl per mL? So confused... >.

*asked on August 1, 2013* -
## CHEMISTRY

Bacterial digestion is an economical method of sewage treatment. 5CO2(g) + 55NH4+(aq) + 76O2(g) right arrow Bacteria C5H7O2N(s) + 54NO2-(aq) + 52H2O(l) + 109H+(aq) bacterial tissue The above reaction is an intermediate step in the conversion of the

*asked on August 1, 2013* -
## chemistry

Nitric acid is produced commercially by the Ostwald process, represented by the following equations. 4 NH3(g) + 5 O2(g) 4 NO(g) + 6 H2O(g) 2 NO(g) + O2(g) 2 NO2(g) 3 NO2(g) + H2O(l) 2 HNO3(aq) + NO(g) What mass in kg of NH3 must be used to produce 4.4

*asked on August 1, 2013* -
## AP CHEMISTRY

Commercial brass, an alloy of Zn and Cu, reacts with hydrochloric acid as follows. Zn(s) + 2 HCl(aq) ZnCl2(aq) + H2(g) (Cu does not react with HCl.) When 0.5093 g of a certain brass alloy is reacted with excess HCl, 0.0953 g ZnCl2 is eventually isolated.

*asked on August 1, 2013* -
## ap chemistry

Consider the following unbalanced reaction. P4(s) + F2(g) PF3(g) How many grams of F2 are needed to produce 212 g of PF3 if the reaction has a 79.8% yield? I did 212/.798=265.66 grams do I convert that to moles next?

*asked on August 1, 2013* -
## chemistry

Consider the following unbalanced reaction. P4(s) + F2(g) PF3(g) How many grams of F2 are needed to produce 212 g of PF3 if the reaction has a 79.8% yield?

*asked on August 1, 2013* -
## chemistry

What mass in kg of NH3 must be used to produce 4.4 multiplied by 106 kg HNO3 by the Ostwald process, assuming 100% yield in each reaction?

*asked on August 1, 2013* -
## chemistry

What mass in kg of NH3 must be used to produce 4.4 multiplied by 106 kg HNO3 by the Ostwald process, assuming 100% yield in each reaction?

*asked on August 1, 2013* -
## chemistry

You have a chemical sealed in a glass container filled with air. The glass container has a mass of 200.0 grams and the chemical has a mass of 800 grams. The total mass of the set-up is 1000 grams. The chemical is ignited by means of a magnifying glass

*asked on August 1, 2013* -
## math

Q1: If K=In a -In b +In c -t/bc,show that K=(ac/b)e^(-t/bc). Q2:Express log(8)5 in terms of m ,where m=lg 2 Q3:Given that log (4)3 =a and log(4)5 =b ,express log(75)16 in terms of a and/or b . really don't know how to do these qns..please help ! thanks a

*asked on July 18, 2013* -
## math

express y=0.1(1000)^x in the form lg y =mx+c ,where m and c are constants ,and x is a function of x . Determine the constants m and c and the function x .

*asked on July 18, 2013* -
## math

evaluate without using a calculator [log(5)4 x log(2)10 ]/ [log(25)√10]

*asked on July 18, 2013* -
## Chemistry

List in increasing order of expected Rf values in a TLC experiment: salicylic acid, toluene, and benzophenone.

*asked on July 1, 2013* -
## Chemistry!!!

1.)The silica that makes up the stationary phase in TLC chromatophraphy is more polar than the mobile phase. What then might the relative positions of the analgesics on the developed TLC plate tell you about the polarity of these molecules? Does this match

*asked on July 1, 2013* -
## math

Sams shoes makes a profit of 38$ on every pair of athletic shoes it sells. How many pairs of shoes must Sam sell to earn a profit of 950?

*asked on June 30, 2013* -
## chemistry

Zn(s) + 2AgNO3(aq) = 2Ag(s) + Zn(NO3)2 (aq) It would require_____g of zinc to produce 5.40g of silver.

*asked on June 12, 2013* -
## english

i need help with my ode poem about mom

*asked on May 30, 2013* -
## math

a 5700 year old bone has 10 c14 atoms. how much c 14 did it have originally?

*asked on May 28, 2013* -
## math

The quotient of p and 5.

*asked on May 28, 2013* -
## chem

Given an aqueous solution in which the [H+] = 2.5EE-7 M, what is the molar hydroxide ion concentration

*asked on May 5, 2013* -
## Calculus

A right circular cone has a constant slant height of 12 feet. Find the radius of the base for which the cone has maximum value

*asked on May 5, 2013* -
## Math

On a map John is standing at (11,11). His friend Lucy is standing at (1,11). John took 10 steps to the right. Is he standing with Lucy now?

*asked on April 23, 2013* -
## Algebra

2 questions I need some help with please! 1. Find the partial sum S5. an= -2n+16 2.Solve the system by triangularizing the augmented matrix and using bakc substitution. 7x=y-6 3y= -5-2x

*asked on April 18, 2013* -
## Algebra

I need some help! Determine whether infinite geometric series has a finite sum. If so, find the limiting value. 112+56+28+....

*asked on April 17, 2013* -
## Algebra

I need some help! Determine whether infinite geometric series has a finite sum. If so, find the limiting value. 112+56+28+....

*asked on April 17, 2013* -
## Literature

In I Am Nujood, The urban elites Nujood encounters in the courtroom and at the Yemen Times lead very different lives from those of Nujood and the country people of Yemen. How are these “enlightened” people actually disconnected from the rest of their

*asked on April 16, 2013* -
## Literature

In I Am Nujood, what enables Shada to take up Nujood’s cause so quickly and effectively? How does Shada, whom Nujood calls her “second mother,” open up Nujood’s world? Who else teaches Nujood about what a “real” family can be like?

*asked on April 16, 2013* -
## Literature

In I Am Nujood, Nujood says that when her family was driven from Khardji, they lost “a small corner of paradise.” How do the injustices endured by Nujood’s father and brother, Fares, show that life in a patriarchal society can be hard not just for

*asked on April 16, 2013* -
## Math

I need some help. A biologist finds that the population of a certian type of bacteria double seach half-hour. An initial culture has 60 bacteria. 1. What is the population after 3 hours? 2. How long will it take for the number of bacteria to reach 983,040?

*asked on April 9, 2013* -
## Algebra Recursive sequence help

I need some help as I'm totally lost! I need to find the first five terms of each recursive sequence. The n-1 on the problem shows it below the a. 1. A1=3 An=2a n-1- 3 2. C1=64, C2=32 Cn= Cn-2 - Cn-1/2

*asked on March 31, 2013* -
## Algebra Multiple Choice help!!

I need help with these! I got B for 1. C for 2. and D for 3. Thanks for the help! 1.) Find the values of a, b, and c that will make the statement true. [5 a -2] [5 102] [3 4 –b] = [-3 -4 3] [2c 5 9] [-2 5 9] a.) 8R1-R2--> =R2 b.) -8R1-R2 -> =R2 c.)

*asked on March 28, 2013* -
## Algebra Multiple choice!!! Help

1.) Find the values of a, b, and c that will make the statement true. [5 a -2] [5 102] [3 4 –b] = [-3 -4 3] [2c 5 9] [-2 5 9] a.) 8R1-R2--> =R2 b.) -8R1-R2 -> =R2 c.) –8R1 +R2 -> =R2 d.) 8R1-R2 -> =R2 2.) Solve the system by triangularizing the

*asked on March 28, 2013* -
## Algebra Multiple choice revised!! HELP

I have a few questions I need help with! Please explain if my answer was not right how you got to it. I got 1.) B 2.) A 3.) C 1. Solve the system by triangularizing the augmented matrix and using back substitution. If the system is linearly dependent, give

*asked on March 28, 2013* -
## Algebra help needed please!!

I have a few questions I need help with! 1. Solve the system by triangularizing the augmented matrix and using back substitution. If the system is linearly dependent, give the solution in terms of a parameter. -3x+y-z=-4 6x-2y+2z=8 -12x+4y-4z=-16 2. Solve

*asked on March 28, 2013*