# kristen

Popular questions and responses by kristen-
## physics

a 62.0kg bungee jumper jumps from a bridge. she is tied to a bungee cord whose unstretched length is 12.0 m and falls a total of 31m a) calculate the spring constant k of the bungee cord and b) calculate the maximum acceleration she experiences.

*asked on August 10, 2014* -
## Chemistry

Predict whether the following reactions will be exothermic or endothermic A) N2(g)+ 3H2(g) --> 2NH3(g) B) S(g) +O2(g) ---> SO2(g) C) 2H2O(g) ---->2H2(g) + O2(g) D) 2F(g) +F2(g) Bond H-H 432 kj/mol N-N(triple bond) 942 kj/mol O=O 494 KJ/Mol F-F 155 KJ/mol

*asked on January 22, 2012* -
## Physics

A traffic light hangs from a pole as shown. The uniform aluminum pole AB is 7.70m long and has a mass of 11.0kg. The mass of the traffic light is 27.5m. 1. Determine the tension in the horizontal massless cable CD. 2. Determine the vertical and horizontal

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

On a quiz worth 5 points, four students earned a 5, seven students earned a 4, six students earned a 3, two students earned a 2, and one student earned a zero. Find the average score. (round to one decimal place)

*asked on September 21, 2015* -
## math

Find the periodic payment R required to amortize a loan of P dollars over t yr with interest charged at the rate of r%/year compounded m times a year. (Round your answer to the nearest cent.) P = 100,000, r = 9.5, t = 23, m = 12

*asked on May 9, 2012* -
## algebra

An “A” is considered 4.0, a “B” is 3.0, a “C” is 2.0, a “D” is 1.0, and an “F” is 0. In your first semester you received the following grades. Calculate your grade point average English = credits 3.0 Grade = C Biology = credits 4.0

*asked on September 22, 2015* -
## algebra

A worker is exposed to 98 dB for five hours and 82 dB for a three hours, giving an eight hour working day. On average what noise level is this worker exposed to? (round to the nearest whole number)

*asked on September 21, 2015* -
## physics! Need help badly

A 4.65 kg object is released from rest while fully submerged in a liquid. The liquid displaced by the submerged object has a mass of 2.60 kg. How far and in what direction does the object move in 0.300 s, assuming that it moves freely and that the drag

*asked on April 18, 2012* -
## Pre calculus

Verify Sinx-sinxcos^2x =sin^3x Need every step!!!

*asked on February 10, 2013* -
## physics

a force of 20N compresses a spring with a spring constant of 50N/m. how much energy is stored in the spring?

*asked on July 23, 2014* -
## Math

A commercial refrigerator unit accidentally releases 12.5 L of ammonia gas at SATP. Determine the mass and number of molecules of ammonia gas released. Please if possible show the steps because I have an exam in an hour and I was trying this question and

*asked on June 21, 2013* -
## AP Physics

A record turntable is rotating at 33 and 1/3 rev/min. A watermelon seed is on the turntable 7.5 from the axis of rotation Calculate the acceleration of the seed assuming that it does not slip? Suppose that the turntable achieves its angular speed by

*asked on January 27, 2008* -
## PreCalc

The half-life of krypton-91 (91Kr) is 10 s. At time t = 0 a heavy canister contains 5 g of this radioactive gas. (a) Find a function m(t) = m02−t/h that models the amount of 91Kr remaining in the canister after t seconds.

*asked on December 4, 2016* -
## physics

a man stands on the roof of a 15.0m tall building and throws a rock with a velocity of magnitude 30.0m/s at an angle of 33 degrees above the horizontal. ignoring resistance calculate the horizontal distance from the base of the building to the point where

*asked on June 27, 2014* -
## trig

establish the identity: cot(A-B)= cotAcotB+1/cotB-cotA thanks for any help at all

*asked on July 16, 2008* -
## physics

Two neutron stars are separated by a distance of 10^14 m. They each have a mass of 10^30 kg and a radius of 10^5 m. They are initiall at rest with respect to each other. How fast are they moving when their seperation has decreased to one-half its initial

*asked on March 16, 2008* -
## psychology/science

what is the full definition of sleep? What are some sleep disorders?

*asked on November 2, 2007* -
## AP Physics

A basketball player, standing near the basket to grab a rebound, jumps 62 cm vertically. How much time does the player spend in the top 15 cm of this jump? How much total time does this player spend in the bottom 15 mc of this jump?

*asked on September 9, 2007* -
## Critical to life is the function of the cell membr

living organisms require energy to function and this includes each and every one of the trillions of cells that constitute the human body. Define in detail and use diagrams appropriate to show how cells extract, use and store energy including but to

*asked on August 23, 2005* -
## algebra

You buy 10 gallons of ice cream for a party, how many cup sized containers can you fill with this?

*asked on September 30, 2015* -
## Chemistry

The half-life for the first-order conversion of A to B is 56.5 hours. How long does it take for the concentration of A to decrease to 10.0% of its original amount? Our professor has given us the answer - 188hr but I am not entirely sure how he got it.

*asked on February 23, 2014* -
## Grd 12 U English

I am the discussion director for my group. I have to grab 4 reallyyy good discussion questions for the book The Kite Runner. I already found one good question, I need the other 3. It has to be from chapter 1-3 PLEASE help me out, i'm so stuck, honestly I

*asked on July 8, 2013* -
## college chemistry

If KHP sample #1 requires 27.30 mL of NaOH solution to reach an endpoint, what volume should be required for samples #2 and #3?

*asked on October 25, 2012* -
## physics

You need to determine the density of a ceramic statue. If you suspend it from a spring scale, the scale reads 35.4 N. If you then lower the statue into a tub of water, so that it is completely submerged, the scale reads 12.4 N. What is the density?

*asked on April 11, 2012* -
## College Chemistry

A heat lamp produces 22.5 watts of power at a wavelength of 6.0 Mu.How many photons are emitted per second? (1watt= 1J/s )

*asked on February 4, 2012* -
## AP physics

A uniform spherical shell of mass M and radius R rotates about a vertical axiss on frictionless bearings. A massless cord passes around the equator of the shell, over a pulley of rotational inertia I and radius r, and is attached to a small object mass m.

*asked on January 27, 2008* -
## AP Physics

A uniform spherical shell of mass M and radius R rotates about a vertical axiss on frictionless bearings. A massless cord passes around the equator of the shell, over a pulley of rotational inertia I and radius r, and is attached to a small object mass m.

*asked on January 27, 2008* -
## AP Physics

To stop a car, you require first a certain reaction time to begin braking. Then the car slows under the constant braking deceleration. Suppose that the total distance moved by your car during these two phases is 56.7 m when its initial speed is 82.5 km/h,

*asked on September 9, 2007* -
## math

Did I set this up right? 6x+3y=510 9x+9y=1080 Val sold 2 types of Valentine's day bouquets: Deluxe and Special. Each Deluxe Bouquet used 6 roses and 9 carnations while each Special Bouquet used 3 roses and 9 carnations. Val has 510 roses and 1080

*asked on September 17, 2019* -
## Algebra 2

The loudness L of sound in decibels is given by L= 10log (l/lo) where l is the intensity of sound and lo is the intensity of the least audible sound. If lo= 10^-12 w/m^2, about how many times more intense is a 108 decibel sound than a 100 decibel sound?

*asked on February 27, 2019* -
## Science

In order for hurricane or tropical storm to develop the temperature of the ocean must be A) 20 degrees F B) 40 degrees F C) 60 degrees F D) 80 degrees F

*asked on January 31, 2019* -
## chemistry

how many moles of NH3 does it take to make 8.0 mol of H20 according to the reaction shown below? 4NH3 + 5O2 --> 4NO + 6H2O I REALLY NEED HELP WITH THIS AS I AM LOST. PLEASE PROVIDE NOTES.

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

"Rocket Man" has a propulsion unit strapped to his back. He starts from rest on the ground, fires the unit, and accelerates straight upward. At a height of 16 m, his speed is 5.0 m/s. His mass, including the propulsion unit, has the approximately constant

*asked on October 21, 2015* -
## algebra

What is the final grade for this student? (round to two decimal places) Quizzes = 5%, Exam 1 = 20%, Exam 2 = 20%, Lab Reports = 15%, Research Paper = 15%, Final Exam = 25% Lab Reports: 75,80,70,75,85,69,90,75 Quizzes: 85,60,70,0,75,80,80,80 Exam 1: 80 Exam

*asked on September 22, 2015* -
## algebra

Julie the Jeweler has fifteen gold necklaces worth $120 each, nine silver necklaces valued at $90 each, ten plated necklaces valued at $60 each and thirty beaded necklaces worth $15 each. What is the average value of a necklace at Julie’s shop? (round to

*asked on September 22, 2015* -
## physics

a 62.0kg bungee jumper jumps from a bridge. she is tied to a bungee cord whose unstretched length is 12.0 m and falls a total of 31m a) calculate the spring constant k of the bungee cord and b) calculate the maximum acceleration she experiences.

*asked on August 9, 2014* -
## Duration

Find the duration of a 6% coupon bond making annual coupon payments if it has three years until maturity and a yield to maturity of 6.5%. What is the duration if the yield to maturity is 10.5%?

*asked on April 10, 2014* -
## Algebra

Fiona and camila took a load of peaches to the farmers market. During the first hour , they sold 1/2 of the peaches plus 1/2 of a peach. In the second hour, they sold 1/3 of the remaining peaches plus 1/3 of a peach. In the third hour , they so,d 1/4 of

*asked on March 17, 2014* -
## Chemistry

How many grams of a 17.7% potassium sulfate solution would contain 419.9 g potassium sulfate? Answer in units of g

*asked on March 13, 2014* -
## Geometry

How many distinct isosceles triangles exist with a perimeter of 99 inches and side lengths that are positive while numbers?

*asked on February 16, 2014* -
## Math

Nine consecutive odd whole numbers sum to 243. Find the sum if the first and last whole numbers in this nine-addend ser.

*asked on December 17, 2013* -
## Math

Find the next three values in the following sequence of numbers. -1,0,1,0,1,2,3,6,11,20,37

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

Maria rode her bicycle for 33 minutes to get to her grandmothers house. She stopped for a snack when she was 5/11 of the way there. How many minutes did she rode her ride before stopping for a snack

*asked on August 11, 2013* -
## physics

As a train moves away from you, the frequency of its whistle is determined to be 475Hz. If the actual frequency was 500 Hz and the speed of sound in air is 350m/s, what is the Train's speed? answer is 18.4m/s please show and explain steps

*asked on July 17, 2013* -
## AP Chem

Calculate the pH after 0.010 mol gaseous HCl is added to 250.0 mL of each of the following buffered solutions: a. .050 M NH3/.15 M NH4Cl b. .5 M NH3/ 1.5 M NH4Cl

*asked on April 3, 2013* -
## Chemistry

Calculate the wavelength of light if 1.50 mol of photons has an energy of 125 kJ. 6.02x10^23 things=1.00 mol(things) c=3.00x10^8 m/sec h=6.626x10^-34 J sec

*asked on February 28, 2013* -
## College Algebra help!!!

I have to solve each equation using a u substitution and need help understanding how to do this. The first equation is: 1. x^2/3-2x^1/3-15=0 2. x+4=7 Squareroot x+4

*asked on February 4, 2013* -
## Physics

A ball weighing 50N is pulled back by a rope to an angle of 20 degrees (the rope that the ball hangs from). Find the tension in the pulling rope.

*asked on October 7, 2012* -
## Physics

Whenever two Apollo astronauts were on the surface of the Moon, a third astronaut orbited the Moon. Assume the orbit to be circular and 160 km above the surface of the Moon, where the acceleration due to gravity is 1.42 m/s2. The radius of the Moon is 1.70

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

a 230.0ml sample of a 0.275 molarity solution is left on a hot plate over night the folowing morning the solution is 1.5 molarity. what volume of solvent has evaportated from the 0.275 molarity solution?

*asked on June 21, 2012* -
## chemistry

a 230.0ml sample of a 0.275 molarity solution is left on a hot plate over night the folowing morning the solution is 1.5 molarity. what volume of solvent has evaportated from the 0.275 molarity solution?

*asked on June 21, 2012* -
## CHEMISTRY

Hydrogen gas and iodine gas react via the equation, H2 + I2 2HI, and K=76 at 600K. If 0.05 mole of HI is placed in a flask at 600K, what are the equilibrium concentrations of HI, I2, H2? I am very lost at where to even start with this problem

*asked on March 18, 2012* -
## Math

Melissa Borrows $1000 on May 8 at 18.5% simple interest. She pays $500 on July 17 and $400 on September 29. What is her balance on October 31 by the merchant's rule? by the United States rule?

*asked on December 13, 2011* -
## math

the maximun height of a ferris wheel is 35m. the wheel takes 2 mins to make one revolution. passengers board the ferris wheel 2m above the ground at the bottom of the rotation. a. write an equation to model this b. how high is the passengers after 45s c.

*asked on July 25, 2011* -
## science

If a temperature increase from 19.0 degrees C to 36.0 degrees C triples the rate constant for a reaction, what is the value of the activation barrier for the reaction?

*asked on March 13, 2011* -
## chemistry

When a solution is diluted with water, the ratio of the initial to final volumes of solution is equal to the ratio of final to initial molarities. true or false?

*asked on March 9, 2011* -
## Chemistry

Describe, in detail, how to make 5.5 liters of a 2.5 molar HCl solution from a 10.5 molar HCl stock solution.

*asked on February 22, 2011* -
## Physics

Friction provides the force needed for a car to travel around a flat, circular race track. What is the maximum speed at which a car can safely travel if the radius of the track is 80.0 m and the coefficient of friction is 0.38?

*asked on February 3, 2011* -
## Geometry

An architect makes a scale drawing. She uses 2 cm to represent 100 m. What is the scale ratio for her drawing? Show your work.

*asked on November 26, 2010* -
## Chemistry

If 20ml of glacial acetic acid (pure HC2H3O2) is diluted to 1.5L with water, what is the pH of the resulting solution. The density of glacial acetic acid is 1.08g/ml

*asked on August 2, 2010* -
## chemistry

If 4.05 g of methane gas (CH4) is introduced into an evacuated 1.40 L container at 53°C, what is the pressure in the container?

*asked on April 20, 2010* -
## chemistry

If 4.05 g of methane gas (CH4) is introduced into an evacuated 1.40 L container at 53°C, what is the pressure in the container?

*asked on April 20, 2010* -
## science

How many grams of NH3, are required to produce 5.23 g HF?

*asked on March 31, 2010* -
## geometry

A grain storage tank is in the shape of a cylinder covered by half a sphere. The height of the cylinder is 50 feet and its diameter is 80 feet. find the total surface area (including the base) and volume of the tank.

*asked on April 21, 2009* -
## geometry

The limestone blocks from which an ancient pyramid was made weigh about 2 tons per cubic yard. Find the approximate weight of the pyramid having a square base of length 250 yards and a height of 150 yards.

*asked on April 21, 2009* -
## Algebra III / Core II

It has been since the beginning of last year since I last did this math and the teacher I currently have is a sub and doesn't know what the heck she's doing either - so if anyone can help me, that'd be oh so amazing! a. Solve d=rt in terms of d and t. b.

*asked on September 7, 2008* -
## physics

In a certain binary star system, each star has the same mass as our sun, and they revolve about their center of mass. The distance between them is the same as the distance between the EArth and sun. Wha tis their period of revolution in years?

*asked on March 16, 2008* -
## ap phyiscs

A bowler throws a bowling ball of radius R=11 cm down a lane. The ball slides on the lane, with initial speed v(of the center of mass)=7 m/s and initial angular speed =0. The coefficient of kinetic friction between the ball and the lane is .25. The

*asked on February 10, 2008* -
## physics

a cue stick strikes a stationary pool ball, exerting an average forece of 50 N over a time of 7 milliseconds. If the ball has mass .1kg, what speed does it have just after impact?

*asked on January 14, 2008* -
## last one i promise....physics

A startled armadill leaps upward rising .536 m in the first .197 s. What is its initial speed as it leaves the ground? What is its speed at the height f .536m? How much higher does it go?

*asked on September 10, 2007* -
## AP Physics...ahaha

A drowsy cat spots a flowerpot that sails first up and then down past an open window. The pot was in view for a total of .43 s, and the top-to-bottom height of the window is 2 m. How high aboe the window top did the flowerpot go?

*asked on September 9, 2007* -
## Stats

In a study that was highly published doctors discovered that aspirin helps prevent heart attacks. The research project which was scheduled to last 5 years employed 22,000 american physicians (all male). Half took an aspirin tablet 3 times a week while the

*asked on February 27, 2007* -
## english

I need help unscambling the letters ooqtisum to make an english word that we get from spanish mosquito

*asked on February 18, 2007* -
## Science

Meat tenderizers contain enzymes. How do these enzymes affect protein in meat? The enzymes break the tendons and muscle to make them more chewable. As I understand it, however, the protein content that is usable in the body is unchanged. The enzyme simply

*asked on October 22, 2006* -
## human anatomy and physiology

living organisms require energy to function and this includes each and every one of the trillions of cells that constitute the human body. Define in detail and use diagrams appropriate to show how cells extract, use and store energy including but to

*asked on August 23, 2005* -
## math

the sum of a number times 8 and 15 is at most -22

*asked on March 5, 2020* -
## English

Re-read lines 232-257. Helena mentions love several times in this passage. How does she describe love? Based on her description, what do you think she believes about love? This question is from the play "A Midsummer Night's Dream" by Henry Thomas and

*asked on February 24, 2020* -
## algebra 2

I need help to solve system by substitution. 6x+3y=0 X+5y=9

*asked on January 9, 2020* -
## math

Tom's treats can sell 100 candy hearts per week if they are priced at $6 each, and 20 hearts per week if they are priced at $10 each. What is the linear demand equation (let x=quantity and y=price)? This means set points (100,6) (20,10) and find m? Then

*asked on September 16, 2019* -
## math

The line through (5,-7) and decreasing at a rate of 3 units of y per 5 units of x. Is this supposed to mean 5x-3y (the latter)?

*asked on September 16, 2019* -
## Math HELP!!!

I’m a Connexus Student and I need help on lesson 10: Prisms and Surface Area

*asked on February 3, 2019* -
## Science

PLEASE CHECK MY ANSWERS!! I AM SOO FAR BEHIND IN THIS CLASS! 1. Which of the following describes the effect of high altitude on climate? Rain is very rare Flooding is more likely Temperatures are lower

*asked on November 21, 2018* -
## Physics

A student drops a stone from the edge of a sea cliff. The sound of the stone striking the ocean is heard 3.8s after the stone is released. The speed of sound in air is 340m/s. Find the height of the cliff. Ignore air resistance.

*asked on November 1, 2018* -
## Tech Business

PLEASE HELP!! I'm so behind. Are my answers correct? This is my last class to pass to graduate, and I have a hard time with it. 1. Which of the following Web 2.0 tool can aid in searches using key words? A) Blogging B) Podcasting C) Tagging(My answer) D)

*asked on September 19, 2018* -
## Math, algebra

Construct a data set of 8 items that has a mean absolute deviation of 0.5 and for which average 8

*asked on November 10, 2017* -
## Bio Statistics - Math

I really need some help and guidance with these! 1.) What kind of variable is P1Wt? 6.) What is the approximate histogram shape of P1Ht? 7.) What is the mean, median, and mode of P1Ht? 9.) What kind of variable is P1Age? 10.) What is the approximate

*asked on September 8, 2017* -
## Physical Science.

I need help answering this inferring question because I don't fully understand it. Q: Infer whether the size of an object's displacement could be greater than the distance the object travels.

*asked on January 18, 2017* -
## Math

How can I use bar diagrams to divide unit fractions by whole numbers?

*asked on December 6, 2016* -
## math

Find the constant as such that the function: f(x)= {x^2-a^2 x does not equal a {8, x equals a

*asked on June 8, 2016* -
## Math

A box can hold 175 cubic inches of cereal. Of the box is 7 inches long and 2.5 inches wide, how talk is it ?

*asked on April 26, 2016* -
## math

If there are 150 students in the club and a recent survey shows that 3 out of 5 prefer Tues. meetings, how many do not want to meet on Tues. ?

*asked on April 20, 2016* -
## English

Do you agree or disagree with the following statement children should begin stadying a foreign languages as soon as they start school.Why? Why not?

*asked on November 25, 2015* -
## life skills

ok if you have a 04 oldsmobile alero gll that gets 29 miles to the gallon and you are traveling 2232 miles how many times would you have to stop for gas if u fill the tank full every time

*asked on October 19, 2015* -
## physics

NASA launches a satellite into orbit at a height above the surface of the Earth equal to the Earth's mean radius. The mass of the satellite is 550 kg. (Assume the Earth's mass is 5.97 1024 kg and its radius is 6.38 106 m.) (a) How long does it take the

*asked on September 27, 2015* -
## Medical Term

I need some help with medical terms. I need to determine the word parts and the definition and I'm having a hard time with these 2. stomatoesophagogastroenterocolitis cardiosphygmopneumographologist

*asked on September 16, 2015* -
## Math

An airplane is flying at an airspeed of 500 km/hr in a wind blowing at 50 km/hr toward the southeast. In what direction should the plane head to end up going due east? (Round your answer to two decimal places.)What is the airplane's speed relative to the

*asked on August 28, 2015* -
## Chemistry

I don't know how to do Titration problems! I have an emergency homework assignment that's crucial to my grade! Please help with tips and step by step response! Please help!- 1. 50ml of 0.3 M KOH are required to titrate 60 ml of H^2SO^4. What is the M of

*asked on May 11, 2015* -
## Math/algebra

Post a New QuestionCurrent Questions Homework Help: Algebra Posted by Kristen on Tuesday, May 5, 2015 at 7:53pm. A bank teller counts her $10 and $5 bills at the end of the day. She has a total of 70 bills. The total value of the money is $595. Let f

*asked on May 5, 2015* -
## Algebra

A bank teller counts her $10 and $5 bills at the end of the day. The total value of the money is $595. Let f represent the number of $5 bills. I have to write an equation that represents the total value of the money. I know f = 5 and 2f = 10 but I am stuck

*asked on May 5, 2015* -
## physics

An object is projected from the surface of the earth with a speed of 2.73x10^4 m/s. What is its speed when it is very far from the earth? (Neglect air resistance).

*asked on March 24, 2015*