Saturday

November 28, 2015
Number of results: 150,603

**math**

Hoshi walk 10 meters in 3 sec. a. what is her walking rate? b. at this rate how long does it take to walk 100 meters c. suppose she walks the same rate for 50 sec. how far does she walk d. wright an equation that represents the distance D that Hoshi walks in 1 sec
*September 2, 2010 by jason*

**Math**

Cho is driving a car. He gets to his destination, which is 72 miles away, in 1 hour and 30 minutes. a. The equation d=rt can be used to model Cho's drive, where d us the distance traveled, r is the speed of the car and, and t is the amount of time spent traveling. Substitute ...
*April 13, 2015 by Jay*

**math!!!**

Molten plastic is injected into the centre of a circular mold of constant height, H, through a small hole. The rate of injection is such that the radius of the plastic inside the mould increases so that r(t)= 3t^2 -2t^3 where the mold has maximum radius of one unit. Compute ...
*July 16, 2012 by HADEEL *

**Math 310 Math for Teachers**

At the same time but different speeds, two trains X and Y left from different stations, A and B, and moved facing each other (to opposite directions). They first met at the point that was 120 miles from station A. When X and Y reached the destinations (B and A respectively), ...
*December 5, 2012 by Stephanie*

**MATH**

If a population consists of ten thousand individuals at time t=0 (P0), and the annual growth rate (excess of births over deaths) is 3% (GR), what will the population be after 1, 15, and a 100 years (n)? Calculate the "doubling time" for this growth rate. Given this growth rate...
*October 9, 2009 by HEENA*

**Algebra**

2. A long distance phone company has a monthly fee of $7.95 and charges a rate of $0.05 per minute. Another long distance company has a monthly fee of $9.95 and charges a rate of $0.03 per minute. At how many minutes would the two companies have equal charges? 15. A boat ...
*June 12, 2010 by mysterychicken*

**General Physics I**

A 50-N force acts on a 2-kg crate that starts from rest. When the force has been acting for 2 s the rate at which it is doing work is: I found this question online so I saw the answer is 2500 Watts. What I don't understand is how to come to this conclusion. Power = Work/time. ...
*October 13, 2010 by VitaX*

**Math**

A speed boat travels at a rate of 20 km per hour in still water. It travels 55 km upstream the same time it travels 90 km downstream. What is the rate of current?
*September 15, 2015 by Sylvia*

**Math**

a balloon is rising vertically at the rate of 2 m/s. an observer is standing on the ground 100m away from a point directly below the balloon. at what rate is the distance between the observer and the balloon changing when the balloon is 160m high?
*September 13, 2012 by Gladys Garcia*

**chemistry **

1.when the concentraion of acetone was doubled, the time was about _____ the original time and the rate was about _______ the original rate. 2.when the concentraion of H+ was doubled, the time was about _____ the original time and the rate was about _______ the original rate. ...
*February 5, 2011 by Sarah*

**compound interest**

How do I solve these problems? Complete the table for a savings account in which interest is compounded continuously. 1. Initial Investment: $1000 Annual % Rate: 3.5% Time to Double: ? Amount After 10 Years: ? 2. Initial Investment: $750 Annual % Rate: ? Time to Double: 7 3/4 ...
*December 11, 2007 by anonymous*

**math**

Seven people rowed 12 miles downstream with the current in 1.5hrs. Coming back upstream against the current covered the same distance but took 4 hours. Find the people rowing rate in the still water and the rate of the current
*March 20, 2015 by Sue*

**math**

A boat's crew rowed 12 miles downstream, with the current, in 1.5 hours. The return trip upstream, against the current covered the same distance, but took 4 hours. Find the crew's rowing rate in still water and the rate of the current... The crew's rowing rate in still water ...
*April 24, 2010 by sam*

**international economic**

2.) This question uses the general monetary model, in which L is no longer assumed constant and money demand is inversely related to the nominal interest rate. Consider the same scenario described in the beginning of the previous question. In addition, the bank deposits in ...
*November 17, 2011 by Anonymous*

**Math**

A mathematical model for concentration of administered cortisone in humans over a 24-hour period uses the function C= [(D x a) / V(a-b)] (e^(-bt)-e^(-at) where C is the concentration, D is the dose given at time t=0, V is the volume of distribution (volume divided by ...
*February 13, 2014 by Meli*

**science**

Object A and B both start at rest. They both accelerate at the same rate. However , object A accelerates for twice teh time as object B. What is the distance traveled by object A compared to that of object B? a) the same distance B) twice as far c) three times as far d) four ...
*September 6, 2007 by Tammy*

**science**

At the annual turtle races, Poindexter, the record holder, is trying to retain his title. As the race begins, Poindexter starts off racing North with a speed of 0.025 m/s. He retains this speed for 0.5 meters at which time he speeds up to 0.10 m/s. He continues at this rate ...
*October 21, 2009 by :)*

**science**

At the annual turtle races, Poindexter, the record holder, is trying to retain his title. As the race begins, Poindexter starts off racing North with a speed of 0.025 m/s. He retains this speed for 0.5 meters at which time he speeds up to 0.10 m/s. He continues at this rate ...
*October 21, 2009 by :)*

**science**

At the annual turtle races, Poindexter, the record holder, is trying to retain his title. As the race begins, Poindexter starts off racing North with a speed of 0.025 m/s. He retains this speed for 0.5 meters at which time he speeds up to 0.10 m/s. He continues at this rate ...
*October 22, 2009 by :)*

**science**

At the annual turtle races, Poindexter, the record holder, is trying to retain his title. As the race begins, Poindexter starts off racing North with a speed of 0.025 m/s. He retains this speed for 0.5 meters at which time he speeds up to 0.10 m/s. He continues at this rate ...
*October 22, 2009 by please help(:*

**rate of reaction**

What is the initial rate of *appearance* of SO3(g)? a reaction and table are given: reaction: 2S02(g)+O2 -------> 2 SO3(g) Table note: i= initial, IRD= initial rate of disappearance; concentrations given in molarity (M) IRD given in M/s. Experiment [SO2]i [O2]i IRD O2 1 0....
*July 20, 2011 by j*

**Algebra**

Need help with these please--- 2. A long distance phone company has a monthly fee of $7.95 and charges a rate of $0.05 per minute. Another long distance company has a monthly fee of $9.95 and charges a rate of $0.03 per minute. At how many minutes would the two companies have ...
*June 12, 2010 by mysterychicken*

**math**

how long will it take to earn $787.50 on $5000 at 5 1/4%(percent) what is the rate it is compounded? annually, semi-annually, monthly, what? dat information is not given aren't you supposed to be using the interest rate formula? if so, then u have two variables missing, the n ...
*February 19, 2007 by Spencer*

**College Math (Calculus)**

Suppose the length of a rectangular box, with lengths x,y,z are changing at the following rates dx/dt = 2 cm /sec dy/dt = -3 cm /sec dz/dt = 1 cm/ sec when x =4, y=3 z=2, Find i) Rate at which volume is changing wrt time, ii) Rate at which the diagonal length of the box is ...
*February 25, 2015 by Wboy*

**math**

The points A, B, C, D, & E are located on a straight line, in order, in accordance with the following conditions: The distance from A to E is 20 cm The distance from A to D is 15 cm The distance from B to E is 10 cm C is halfway between B & D What is the distance from B to C?
*December 18, 2012 by bob*

**physics**

the velocity time graph of a car start from rest and it accelerate uniformly at a rate 3m/s2 for 5seonds if attain the velocity which maintain for 1m the car then brought to rest by a uniform retardation after another 30m. draw the velocity time graph. find the acceleration. ...
*February 12, 2015 by simeon*

**algebra**

A car is stopped at a traffic light. The light changes to green and the driver starts to drive, accelerating at a rate of 4 m/s^2. Write an equation for the distance the car travels in time.
*March 3, 2013 by sam*

**Math**

A particle is moving along the x axis so that its distance x in meters,at time t seconds,is x(t)=3,2(sqrt of tan (5t)).Find its velocity at time t=1,5 seconds.
*September 21, 2015 by Butho*

**Calculus**

The burning candle A candle is placed a distance l1 from a thin block of wood of height H. The block is a distance l2 from a wall as shown in Figure 7.1. The candle burns down so that the height of the flame, h1 decreases at the rate of 3 cm/hr. Find the rate at which the ...
*October 26, 2010 by Fee*

**Maths**

A cyclist rides one lap of a circular track at a constant speed so that the riders distance, d meters, from the starting point at any time, t seconds, after starting is: d= (50) - ( 50cos x (pi)t/30, find: (a) the time taken to complete one lap (b) the radius of the track (c) ...
*June 21, 2012 by arif*

**MATH**

We do not provide the units for your answers. Do no type them in the answer box. Enter the numerical value or calculations only. You drove 2695 miles in 35 hours. (1) What is your average rate of change? (2) Suppose you can drive that distance at a legal 75 mile per hour rate...
*September 9, 2010 by URGENT DUE TODAY*

**Calculus! Please help me!**

A person on a bicycle is 100 meters west of a person in a car. the person on the bike starts to ride at 8 meters per second directly east and at the same time the person in the car starts to drive directly north at 18 meters per second. Write the distance between the bicycle ...
*March 17, 2011 by Sam*

**math**

jason leaves detroit at 2 pm at a constant speed. he passes ann arbor, 40 mi. from detroit, at 2:50 pm. express the distance traveled in terms of time elapsed. i know d=rt. t=50 min. d=40 mi. does that mean the r= 4/5 mi/min. ? but how would u get the answer from there? I ...
*September 28, 2006 by hawkstar*

**displacement...**

At the annual turtle races, Poindexter, the record holder, is trying to retain his title. As the race begins, Poindexter starts off racing North with a speed of 0.025 m/s. He retains this speed for 0.5 meters at which time he speeds up to 0.10 m/s. He continues at this rate ...
*October 22, 2009 by :)*

**Physics**

By trial and error, a frog learns that it can leap a maximum horizontal distance of 1.4 m. If, in the course of an hour, the frog spends 32% of the time resting and 68% of the time performing identical jumps of that maximum length, in a straight line, what is the distance ...
*May 21, 2012 by James*

**physics**

By trial and error, a frog learns that it can leap a maximum horizontal distance of 1.49 m. If, in the course of an hour, the frog spends 32.5 % of the time resting and 67.5 % of the time performing identical jumps of that maximum length, in a straight line, what is the ...
*September 15, 2013 by Huiming*

**Physics**

By trial and error, a frog learns that it can leap a maximum horizontal distance of 1.26 m. If, in the course of an hour, the frog spends 27.5 % of the time resting and 72.5 % of the time performing identical jumps of that maximum length, in a straight line, what is the ...
*January 27, 2015 by Tommy*

**math**

the table below gives the distance jose, mario, and melanie travel for the first 3 hours. assume that each person cycles at a constant rate. find the average rate at which each person tavels during the first 3 hours.explain
*October 3, 2008 by oretha*

**math**

1. A baseball diamond is a square with a distance of 90 feet between the bases. A runner is running from first base to second at the constant rate of 20 feet per second. How fast is the distance between the runner and the catcher changing when the runner is halfway from first ...
*October 9, 2011 by Eun*

**Physics**

By trial and error, a frog learns that it can leap a maximum horizontal distance of 1.26 m. If, in the course of an hour, the frog spends 27.5 % of the time resting and 72.5 % of the time performing identical jumps of that maximum length, in a straight line, what is the ...
*January 29, 2015 by Brittany*

**math**

if a basketball is dropped from 160 feet, what is the total vertical distance the ball will travel from the moment it is dropped to the time it hits the floor for the fifth time?
*December 23, 2014 by ciara*

**algebra 1**

fred begins walking at three mi/h. john leaves his house at the same time and walks towards freds house at a rate of 2 mi/h. how long will it be befor thhey meet the distance between the two houses is 4 miles?
*March 25, 2008 by nathan*

**Math**

The distance traveled (in meters) by the Oregon slug can be modeled by the function f(t) = 0.9t, where t is the time in minutes. Find the distance traveled in 27.5 minutes.
*December 18, 2013 by Megan*

**maths**

A truck rolls down a hill subject to acceleration due to gravity and resistance (including air resistance, rolling friction, etc) and the distance si (metres) travelled after ti seconds is observed. Classical mechanics predicts that the distance travelled by the truck should ...
*September 15, 2013 by help please*

**AP Macroeconomics**

Which of these is a component of the interest rate on a 10-year inflation indexed US government bond? A.)Risk that the borrower will default B.)Positive rate of time preference C.)Expected inflation rate D.)general uncertainty about the future
*October 20, 2013 by Emily*

**chemistry 1310**

The decomposition of nitrosyl bromide is followed by measuring total pressure because the number of moles of gas changes; it cannot be followed colorimetrically because both NOBr and Br2 are reddish brown: 2 NOBr(g) ® 2 NO(g) + Br2(g) Use the data in the table to answer the ...
*January 24, 2011 by shamia *

**9th grade algebra math hw, help?(:**

The table below shows the cost of renting a bike for a given amount of time, find the rate of change in cost with respect to time. Table: Time: 1.75, 4, 7. Cost( Dollars)4.375, 10, 17.5 Could one of the tutors please explain to me how to this? Thanks :) -Allyson
*November 16, 2010 by Allyson*

**math**

the lengths of two legs of a right triangle depend on time. One, whose length is x increase at the rate of 5 feet per second, while the other, of length y, decreases at the rate of 6 feet per second. At what rate is the hypotenuse changing when x=3 and y=4? is the hypotenuse ...
*November 26, 2012 by Aaron*

**physics**

An object uniformly accelerates at a rate of 1.20m/s^2 east. While accelerating at this rate, the object is displaced 470.4m east in a time of 28 s. What velocity did this object reach in this time ? I used Vf=Vi+at which will be Vf=(1.20)(28) but i feel this isn't the way to ...
*March 3, 2015 by Dania *

**Math**

The phone company charges a flat rate of $2.50 plus and additional $0.50 each minute for a long-distance phone call. Write an equation to represent the total cost of making a long-distance phone call.
*June 18, 2013 by Yasmen*

**Math**

An airplane flying at a speed of about 100 mph was once overtaken and passed by a flock of sandpipers! Suppose that a flock of these birds can fly at 110 miles per hour with a certain wind and at 90 mph against it. If they fly a certain distance with the wind and the same ...
*October 24, 2012 by JJ*

**math**

a heavy freight train made a trip of 360 miles, running part of the distance at 54 miles an hour and the rest at 48 miles an hour.if the entire trip took 7 hours,find the distance traveled at each rate.
*February 3, 2010 by chris*

**Physics,Question ,Solved but about Units?**

These are “plug-in-the-number” tasks to familiarize you with the main formulas that link the physics concepts of this chapter. They are one-step substitutions, much less challenging than the Think and Solve problems that follow. Average speed ! total distance covered travel ...
*October 10, 2012 by Katherine*

**math**

The height of a cylinder with a fixed radius of 10 cm is increasing at the rate of 0.5 cm/min. Find the rate of change of the volume of the cylinder (with respect to time) when the height is 30cm.
*March 9, 2015 by Gary*

**Science!! Please HELP**

If a population consists of 10,000 individuals at time t=0 years (P0), and the annual growth rate (excess of births over deaths) is 3% (GR), what will the population be after 1, 15 and 100 years (n)? Calculate the "doubling time" for this growth rate. Given this growth rate, ...
*October 6, 2009 by Rani*

**math**

Pairs of markings, a set distance apart, are made on highways so that the police can detect drivers exceeding the speed limit. Over a fixed distance, the speed R varies inversely with the time T. For one particular pair of markings, R is 35mph when T is 6 seconds. Find the ...
*July 24, 2015 by kayla*

**physics**

the distance between a loudspeaker and the left ear of a listener is 2.70 m a) calculate the time required for sound to travel this distance if the air temperature is 20oC. b) assuming that the sound frequency is 523 Hz, how many wavelengths of sound are contained in this ...
*November 18, 2012 by Joe*

**math**

Could someone check my answer: the question is: The equation y= 12x +5 shows the total cost for ordering tickets on the phone for a certain outdoor concert. Tickets are $12 each, and there is a one-time service fee of $5. Can the slope of this line be thought of as a rate? ...
*September 16, 2009 by sam*

**trig**

An object suspended from a spring is oscillating up and down. The distance from the high point to the low point is 30 cm, and the objects take 4 sec to complete 5 cycles.For the first few cycles the distance from the mean position, d(t), in cm with respect to the time t sec is...
*July 20, 2013 by Azal - pleaseee helpp*

**Physics**

What is the equation for average velocity given x1 (initial distance), x2 (final distance), t1 (initial time) and t2 (final time)?
*October 21, 2010 by Anna*

**Speed'Distance'Time**

Find out the distance covered when, speed is 960 km/hour and time is 1 hour 50 minutes.
*March 19, 2013 by Michelle*

**Solving for distance**

what distance did a car travel if the speed was 75mph and was on the road for 9 Hours? I need to know how I can figure out this question usin g my calculator step by step distance= speed * time.
*May 18, 2007 by Brooke*

**Physics**

A 50 kg cart rests on frictionless surface. A net force of 75 N acts on the carts over a distance of 2m. What maximum speed does the cart reach? Work: I can figure that the acceleration is 1.5m/s/s, Vi= 0. I was thinking maybe if I found time through the kinematic equation d=...
*November 30, 2014 by Sam*

**Mathematics**

A man walked for some distance at 8 km/h, and for an equal distance at 5 km/h. The total time he took was 13/4 hours. Find the total distance he walked. Explain your workings
*November 5, 2011 by Ruby*

**Math interest rate**

Please explian how to figure out the the initial interest rate of the ARM ? Given th these facts thanks :) Ben bought a home with an adjustable-rate mortgage. The margin on the loan is 2.7% and the rate cap is 7.2% The current index rate is 4.3%
*November 14, 2007 by Anonymous*

**Math/chem**

If the temperature of a solution goes up 25degrees in 7 minutes, what is the rate of change of temperature? (Rate= temp. Change/ time)
*September 3, 2014 by Jamie*

**math**

ANGULAR SPEED OF A RACE CAR. A race car is driven around a circular track at a constant speed of 180miles per hour. If the diameter of the track is 1/2mile, what is the angular speed of the car? Express your answer in revolutions per hour(which is equivalent to laps per hour) ...
*June 13, 2007 by michelle*

**Math**

Which is NOT true about the Table? x: 1 | 2 | 3 | 4 | y: 1 | 4 | 9 | 16 | A. it shows a linear function B. x increases by 1 each time C. the rate of change is not constant D. y increases by a different value each time D please check
*April 30, 2015 by Anonymous *

**physics-circular motion**

the turntable of a record player rotates at a rate of 11 1/3. A record with a radius of 15cm is being played. a punk kid throws a piece of gum that lands right on the edge of the record. What linear distance in meters does the gum travel if it stays on the record for 10 ...
*March 4, 2007 by kate*

**Math**

Someone loaned me $20.00 in 1962 without quoting an interest rate. Using whatever the market interest rate was at that time, how much money would I owe in 2013 including principal and interest, straight and compounded.
*December 22, 2013 by Bee*

**chemmm helppppppppp**

Consider the following reaction: 2N2O(g)--->2N2(g) + O2(g) a. express the rate of the reaction with respect to each of the reactants and products. b.In the first 10.0 s of the reaction, .018 mol of O2 is produced in a reaction vessel with a volume of .250L. What is the ...
*February 1, 2009 by Natash*

**Chemistry**

1. How is the rate affected by doubling the concentratino? 2. Explain the effect of concentration on the rate of a reaction in terms of the "Collision Theory" of chemical reactions. 3. Considering that 1/Time is proportional to the rate of the reaction how is the rate of the ...
*November 18, 2007 by Dick Rogers*

**math**

how do you8 find unit rate divide quantity by time. For instance, one travels 45 miles in 1/2 hour. Unit rate= 45/.5=90miles/hr the answer to your problem is x=18 the answer to your problum is x=18
*March 6, 2007 by brianna*

**math 117**

A passenger train can travel 325 mi in the same time a freight train takes to travel 200 mi. If the speed of the passenger train is 25 mi/h faster than the speed of the freight train, find the speed of each. Speed = distance/time Therefore time = distance/speed. Assume the ...
*July 11, 2007 by Diana*

**algebra**

A motorboat traveling a distance of 225 miles in 5 hours while traveling with the current. Against the current, the same trip took 9 hours. Find the rate of the boat in calm water and the rate of the current. rate of boat mph rate of current mph
*November 23, 2014 by Jer*

**math**

Fred begins walking toward John house at 3 mi/h. John leaves his house at the same time and walks toward Fred's house on the same path at a rate of 2 mi/h. How long will it be before they meet if the distance between the houses is 4 miles? First, I set up an equation, 3h+2h=4...
*October 23, 2007 by robert*

**physics**

Derive a general equation for the time of flight of the banana en route to the monkey in terms of only the velocity, distance, and height hint: if you are doing everything right, there should be a lot of cancellations resulting in a relatively simple solution Okay, this is ...
*October 25, 2015 by Spice*

**Economics/Math**

3. Assume you own a painting. If you sold it now, you could get £500 for it. However, the amount that people will be willing to pay in the future increases by £25 in odd years (including the first one) and by £26 in even years, for the next 53 years. If the interest rate stays...
*December 4, 2009 by Susan *

**Physics**

The distance between earth and the moon can be determined from the time it takes for a laser beam to travel from earth to a reflector on the moon and back. If the round-trip time can be measured to an accuracy of 0.19 of a nanosecond (1 ns = 10-9 s), what is the corresponding ...
*October 13, 2007 by Mary*

**Physics**

A power boat of mass 475 kg is cruising at a constant speed of 8.9 m/s. The propeller provides a drive force of 770 N. The driver of the boat shuts off the engine, and the boat coasts to a halt. Assume -- contrary to fact -- that the resistive force due to the water is ...
*February 26, 2007 by Mary*

**Math2**

The universal law of gravitation determines the amount of force exerted by a constant mass (M) on another constant mass (m), separated by a distance (r), is given by the expression F = ( -GmM )/r^2 a) What mathematical expression characterises the instant rate of change of the...
*October 18, 2011 by Raf*

**math**

find the area of a right angled riangle. find the distance from A to B. Find the distance from B to C. Find the midpoint B(-1,4) A(-1,-1) C(4,-1) thanks for your time and help.
*June 12, 2013 by Anonymousab*

**chemistry**

You mix together in the proper manner the following VOLUMES: 0.0100 M Potassium iodide...9.2 mL 0.0010 M Sodium thiosulfate...6.5 mL Distilled water...16.8 mL 0.0400 M Potassium Bromate...13.9 mL 0.100 M Hydrochloric acid...6.1 mL Using the rate constant and rate equation ...
*March 2, 2013 by Cassie*

**physics**

a car accelerates from rest at a constant rate alpha for some time, after which it decelerates at a constant rate beeta and comes to rest. if the total time elapsed is t, the maximum velocity acquired by the car will be?
*August 15, 2014 by aman verma*

**Physics please help!**

The distance between earth and the moon can be determined from the time it takes for a laser beam to travel from earth to a reflector on the moon and back. If the round-trip time can be measured to an accuracy of 0.19 of a nanosecond (1 ns = 10-9 s), what is the corresponding ...
*October 14, 2007 by Mary*

**math**

on the average your heart beats about 72 time per minute. at this rate, about how many time will it beat in 30-day month and in a year and in your lifetime, if you live to 72 years of age?
*November 28, 2009 by mariyam*

**chem**

H2o2+3i+2h -----> I3+2H2o In the first 10.0 second of the reaction the concentration of I dropped from 1.000M to 0.868M a) calculate the average rate of reaction for iodine in this time interval. b) Determine the rate of change in the concentration of H during this time ...
*October 15, 2013 by niki*

**physics please help??**

I know how to do this problem, but I am having a difficult time figuring out the distance . I thought that from wire 1 to P2 the distance is 45 cm, and the distance from wire 2 to the p2 the distance is 35 cm. However, I believe I am wrong, can someone please explain o me ...
*October 27, 2012 by henry*

**math**

can you please explain this question to me for part b i get t=0.7 by trial and error and 86 percent of the population but im sure theres a more exact way to do it (a) A chemical process produces NaCI at the rate 3t^1/2 grams per minute. (i) What is the rate of production 4 ...
*May 25, 2010 by jessie urgent please*

**Physics**

(I'm only posting the questions I couldn't figure out, don't worry.) An object released from rest at time t=0 slides down a frictionless incline a distance of 1 meter during the first second. The distance traveled by the object during the time interval from t=1 second to t=2 ...
*January 17, 2008 by Hannah*

**Math**

A U.S. company sells products to a Dutch company and will receive payment of €550,000 in three months. At the time of sale, the spot rate of the euro was $1.25, and the 90-day forward rate was $1.21. At the time of sale, the U.S. company negotiated a forward contract with a ...
*October 23, 2007 by Kd*

**College Physics**

In 1986, the distance of closest approach of Halley’s comet to the Sun is 0.57AU. (1 AU is the mean Earth-Sun distance = 150 million kilometers.) The comet’s speed at closest approach is 54.97 km/s. (a) – By 1989, Halley’s comet had traveled to a distance corresponding to the ...
*November 4, 2012 by johnathan*

**Algebra**

The tour de France is a bicycle race that begins in Ireland but is primarily a race through France. On each day, racers cover a certain distance depending on the steepness of the terrain. Suppose that one particulAr day the racers must comp,tee 210 mi. One cyclist traveling 10...
*April 18, 2011 by Anonymous*

**math**

A 16-ft ladder is sliding down a wall as shown in the figures below. The variable h is the height of the ladder's top at time t, and x is the distance from the wall to the ladder's bottom. Suppose that the top is sliding down the wall at a rate 5 ft/s. Calculate dx/dt when h...
*June 29, 2010 by Jacob*

**Calculus**

A woman at point A on the shore of a circular lake with radius 2.5mi wants to arrive at the point C diametrically opposite A on the other side of the lake in the shortest possible time. She can walk at a rate of 3.25 mi/hr and row at a rate of 2 mi/hr. Find shortest time.
*April 30, 2013 by Shannon*

**physics**

a) Find the maximum rate of deceleration of a car on a dry, level road, assuming the coefficient of static friction between tires and pavement equals 1.4. (b) Find the minimum stopping distance if the car has an initial speed of 27.5 m/s. (c) Repeat parts (a) and (b) assuming ...
*February 8, 2011 by Anonymous*

**Math**

1. "A bacteria population doubles in number every 3 hours. If there are 40 individuals now, how many in 24 hours?" SO I used the geometric series sum formula, with n=8(24/3=8), t1=40, and r=2, but I got 10200 as the answer, instead of what the answer key solves as 10240. What ...
*January 24, 2015 by Bethany*

**Chem**

Consider the following reaction: 6A + 2B 5C + 4D Determine the following rates at a time when the rate of consumption of B is 2.5E-05 M/s. a) rate of consumption of A M/s b) rate of formation of C M/s c) rate of formation of D M/s d) rate of reaction M/s
*November 14, 2011 by Rachel*

**math**

a car travelved a distance of 195 miles in 3 hours 15 minutes what is the unit rate
*April 19, 2014 by jane *

**Physics**

The distance between a loudspeaker and the left ear of a listener is 2.19 m. (a) Calculate the time required for sound to travel this distance taking the speed of sound to be 343 m/s. (b) Assuming that the sound frequency is 525 Hz, how many wavelengths of sound are contained ...
*March 3, 2013 by Tim*