# 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## 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* -
## chemistry

When magnesium is heated in air, it reacts with oxygen to form magnesium oxide. 2Mg + O2 --> 2MgO If the mass of the magnesium increases by 0.335 g, how many grams of magnesium reacted? A. 0.882 B. 0.441 C. 0.509 D. 1.02 E. Not enough Info

*asked on July 5, 2010* -
## trig

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

*asked on July 16, 2008* -
## Pre calculus

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

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

Four hoses are filling a pool. The first hose alone would fill the pool in 4 hours while the second hose takes 6 hours. The third hose and the fourth hose each take 8 hours to fill the pool. How long would it take to fill the pool if all 4hoses are turned

*asked on November 20, 2013* -
## 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* -
## 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 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* -
## 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* -
## 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* -
## 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* -
## 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

1: The table shows the low outside temperatures for Monday, Tuesday, and Wednesday. By how many degrees did the low temperature drop from Tuesday to Wednesday? 2) The table shows the low outside temperatures for Monday, Tuesday, and Wednesday. By how many

*asked on November 6, 2014* -
## 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

Find six consecutive multiples of 6 whose sum is the least common multiple of 13 and 18.

*asked on December 5, 2013* -
## 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* -
## 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* -
## College Algebra

Solve for the specified variable in each formula or literal equation Sn=n(a1+an/2) for n (sequences)

*asked on January 27, 2013* -
## College Algebra

Hello I need help with this problem. I need to identify if the equation is identity, contradiction, or conditional equation. -(5x-3)+2x=11-4(x+2)

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

Suppose that you toss a coin and roll a die. What is the probability of obtaining each of the following combinations? (Enter your answers as fractions.) P(Tails or a Five)

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

How many Moles of solute particles are present in 1 mL of aqueous 0.070 M (NH4)2CO3? ____ mol of Particles

*asked on November 14, 2012* -
## Chemistry

The equlibrium constant K, for the reaction, H2 + CO2 H20 + CO, is 4.2 at 1650 degrees C. Initially, 0.80 mol H2 and 0.80 mol CO2 are injected into a 5.0L flask. Calculate the concentration of each species at equilibrium.

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

We consider the case shown in the figure below. Two objects with masses m and M are connected with a taut string running over a pulley. The pulley rotates without friction. The two masses are given as M = 6.23 kg and m = 2.54 kg. A second taunt string

*asked on October 4, 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* -
## physics

A child wants to throw a rock into a puddle which is 20m away and 20m down a hill. If he can throw the rock at ana ngle of 60, what velocity does he need to release the rock at?

*asked on November 17, 2010* -
## 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* -
## 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 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* -
## AP physics

On Block has a mass M=500 g, the other has mass m=460 g, they are hooked to a string and is on a pulley will one mass on either side, the pulley, which is mounted in horizontal frictionless bearings, has a radius of 5 cm. When released from rest, the

*asked on January 27, 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* -
## AP BIO...PLEASE HELP

Which of the following statements about NAD+ is false? A). NAD+ is reduced to NADH during both glycolysis and Krebs cycle B). NAD+ had more chemical energy then NADH C). NAD+is reduced by the action of dehydrogenases D). NAD+ can receive electrons for use

*asked on November 4, 2007* -
## I am soooo lost in physics

a ball of moist clay falls t the gournd from a height of 12m . It is in contact with the ground for 20.5 ms before coming to rest. What is the average acceleration of the clay during the time it is in contact with the ground?

*asked on September 10, 2007* -
## math

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

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

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

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

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* -
## 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* -
## 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* -
## Finance

A bond currently sells for $1,120, which gives it a yield to maturity of 5%. Suppose that if the yield increases by 25 basis points, the price of the bond falls to $1,070. What is the duration of this bond?

*asked on April 10, 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* -
## 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* -
## Math

How many terms are in the following sequence that follows? 3,7,11,....,439

*asked on January 7, 2014* -
## Math

If f(x) = x^4 -5x^2 +4, for what values of x is the absolute value of f(x) not differentiable?

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

If Gold sells for $1200.00 an ounce, how many atoms of gold can you buy for a penny? Please, Show work.

*asked on March 27, 2013* -
## Chemistry

A cat is about 10.0% Carbon. My cat weighs about two kilograms. How many moles of Carbon are in my cat?

*asked on March 27, 2013* -
## communication

Please HELP!! Question 1 of 20 5.0 Points Which of the following would be the LEAST appropriate in the closing paragraph of a negative message? A. "Let us know if model #A01 would be a suitable substitution." B. "Our layaway plan will enable you to

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

Can someone help me identify the functional groups and what the chiral carbons are? NOTE: THE LAST C HAS A DOUBLE BOND POINTED UPWARDS CONNECTED TO O. SORRY I TRIED MAKING IT AS CLEAN AS I CAN. STARTING FROM LEFT TO RIGHT THE 2ND C HAS A NH3 ATTACHED. THEN

*asked on December 19, 2012* -
## Chemistry

I need help drawing these structures. 2-chloro-3-ethylhexanal 2,2-dimethylcyclopentanol 5,5,7-triiodo-trans-3-nonene para-bromomethylbenzene Thanks for the help I'm having hard time with these.

*asked on December 19, 2012* -
## Algebra

A farmer plans to enclose a rectangular region using part of his barn for one side and fencing for remaining sides. The area of the region is maximized when the width is 30 feet. a.) write an equation that could model the area as a function of the width.

*asked on September 20, 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* -
## math

one sixth of five dozen computers were shiped how many were not shiped b what was the ratio of computers were shipped to those that were not shipped c what percent of computers were shiped

*asked on March 26, 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* -
## physics

A diver, below the surface of a lake, notices that no light appears to be coming toward her greater than the angle è, measured from the vertical. If the index of refraction of water is 1.33, what is the angle è (which is the critical angle of total

*asked on November 28, 2011* -
## physics

I don't know how to this problem please help. A 10 kg object sits 5 m away from a 50 kg object. Calculate the force of attraction between the two masses

*asked on November 8, 2011* -
## Physics

A 1440-kg crate of cabbages is laid on a level, frictionless track at the end of a heavy spring. The spring is compressed a distance of 0.100 m by a force of 83500 N. When the spring is released, it propels the crate. the spring constant of the spring

*asked on April 4, 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

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* -
## Algebra

A rectangle has an area given by A=x^2+7x+2. Find expressions for the possible length and width of the rectangle.

*asked on February 16, 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* -
## AP Biology

The relatioship of structure to funtion is one of the major themes in biology. Describe the structure of enzymes and then expliain how the function (catalysis) is related to structure. Aslo discuss some factors that may affect the activity of the enzyme

*asked on September 30, 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* -
## Physics

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

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

A ball of moist clay falls to the ground from a height of 12 m. It is in contact with the ground for 20.5 ms before coming to rest. What is the average acceleration of the clay during the time it is in contaact with the ground?

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

A startled armadillo 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 of .536m? How much higher does it go?

*asked on September 9, 2007* -
## 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* -
## 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* -
## human anatomy and physiology

1. name and define in detail the four organic compound groups that make up the chemistry of living things. Lipids, carbohydrates, proteins, and nucleic acids. See Part IV of http://www.ucmp.berkeley.edu/people/brs/biol1a/Lect2.html for specifics

*asked on August 23, 2005* -
## 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

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* -
## 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* -
## 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* -
## Math HELP!!!

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

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