Wednesday

October 22, 2014

October 22, 2014

Total # Posts: 687

**math**

How long will it take a car 3m long travelling at 100km/h to overtake a truck 10m long travelling at 50km/h, if the car is 10m behind the truck
*October 15, 2014*

**College Chemistry lab**

did you manage to solve this?
*October 13, 2014*

**Math @Reiny**

Did I do #2 right? 2.) (1-2i)/2i (1-2i)/2i = (1-2)/i x i/i = (1i-2i)/i^2 = (1i+2) =2+1i
*October 8, 2014*

**Math**

1.) If a = 2 and the vertex of a parabola is (3, -4), will there be a minimum or maximum value for the parabola? What is the value? 2.) If a = 2 and the vertex of a parabola is (3, -4), what is its axis of symmetry?
*October 7, 2014*

**Physics-Intro**

(massbullet * velocitybullet)/massgun (60.0 * 575/4.50) = 7666.66666 Which rounded off becomes 76.7m/s
*October 7, 2014*

**Physics-Intro**

A bullet with mass 60.0 g is fired with an initial velocity of 575 m/s from a gun with mass 4.50 kg. What is the speed of the recoil of the gun?
*October 7, 2014*

**physics**

A car travels along a straight stretch of road. It proceeds for 15.9 mi at 51 mi/h, then 25.3 mi at 41 mi/h, and finally 34.3 mi at 38.6 mi/h. What is the car’s average velocity during the entire trip? Answer in units of mi/h
*October 3, 2014*

**physics**

Find the total force necessary to give a rocket of mass 25,000 slugs an acceleration of 28.0 ft/s2.
*September 30, 2014*

**physics**

One ball is dropped from a cliff. A second ball is thrown down 1.00 s later with an initial speed of 40.0 ft/s. How long after the second ball is thrown will the second ball overtake the first?
*September 30, 2014*

**physics**

A bullet is fired vertically upward from a gun and reaches a height of 7000 ft. Find its initial velocity. How long does it take to reach its maximum height? How long is it in flight?
*September 26, 2014*

**Physics**

A rock is dropped from a bridge to the water below. It takes 2.40 s for the rock to hit the water. Find the speed (in m/s) of the rock as it hits the water. How high (in metres) is the bridge above the water?
*September 26, 2014*

**Math (Pre-Calculus)**

@bobpursley How did you get 3 and 5?
*September 18, 2014*

**Math (Pre-Calculus)**

Can someone help me with this? Thanks! Find the zeros of the function algebraically. f(x)=x^2-8x+15 ---------------- 10x
*September 18, 2014*

**Physics**

When I work this problem I get an answer different from what's given not sure why? A basketball is launched with an initial speed of 8.8 m/s and follows the trajectory shown. The ball enters the basket 0.98 s after it is launched. What are the distances x and y? Note: The ...
*September 14, 2014*

**Calculus**

Using the definition of derivative state the function, f(x) and the value of a for lim as h->0 of (square root of (121+h) -11)/h
*September 7, 2014*

**Math**

Olivia's chessboard is 11 sq centimeters. A chessboard. Has 8 sq on each side. To the nearest tenth what is the width of the chessboard
*September 2, 2014*

**Algebra**

It should be on your formula sheet if not then look it up.
*August 24, 2014*

**Algebra**

Use the distance formula.
*August 24, 2014*

**Algebra 2. Please Help Someone!!**

an airplane's altitude is 100 feet as it descents for a landing on a runway whose touchdown is 5000 ft away. Let the x-axis represent the ground and the y-axis represent the airplane's altitude. What is the slope of the airplane's descent? What is the y-intercept ...
*August 24, 2014*

**maths**

A man uses a fifth of his income on his rent,a third on education and one half of the remainder on clothing. (A) what fraction of his income does he spend on clothing? (B)How much does he spend on clothing,if his income is $2,000,000?
*August 4, 2014*

**Math**

A model airplane is shot up from a platform 1 foot above the ground with an initial upward velocity of 56 feet per second. The height of the airplane above ground after t seconds is given by the equation h=-16t^+56t+1, where h is the height of the airplane in feet and t is the...
*July 24, 2014*

**Math**

Solve the following quadratic-linear system of equations. y=-x^2-x-6 y=2x-2 A. (3, 6) and (–1, 2) B. (4, 6) and (–1, –4) C. (3, –6) and (2, 4) D. (–4, 3)
*July 24, 2014*

**science**

Calculate the volume of a graduated cyclinder that has a radius of 10 mm and a height of 120 mm.
*July 15, 2014*

**math 8th grade**

what the answer to the worksheet how does a hawaiian baritone?
*May 21, 2014*

**Math**

A spinner numbered 1-10 is spun. what is the probability of spinning a multiple of 3 and a multiple of 2?
*May 11, 2014*

**Steps in Chemistry**

add lime. plot sections for water, lime and salt to compare.
*May 8, 2014*

**econ**

What percentage of GDP in 2000 is consumption Calculate net exports for 2001. (Express your answer in billions of dollars.)
*April 7, 2014*

**health**

I got B
*April 2, 2014*

**health**

A was correct for me
*March 29, 2014*

**physics**

a car traveling at 43m/s decelerates at a rate of 7.1 m/s squared. how long did it take the car to stop? what distance did the car travel while stopping?
*March 27, 2014*

**Health**

As mixed-doubles teammates in tennis, Kara and Tran are trying to devise their best strategy against an opponent that has two excellent servers but his physical fitness level is not as good as Kara and Trans. How can Kara and Tran use their superior cardiovascular endurance to...
*February 25, 2014*

**physics**

A spring of force constant 655 N/m is used to launch a 5.25 kg mass from the edge of a frictionless table that is 1.20 m above the floor. How far horizontally away from the table will the mass land if the spring was compressed 42.0 cm before launching?
*February 13, 2014*

**Chemistry**

how many grams of potassium iodide can be produced by the reaction of 150 grams of iodide and 45.6 grams of potassium?
*February 6, 2014*

**physics**

A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes the blade is 33.6 ...
*January 30, 2014*

**physics**

A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes the blade is 33.6 ...
*January 30, 2014*

**physics**

A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes the blade is 33.6 ...
*January 30, 2014*

**physics**

A stream of water strikes a stationary turbine blade horizontally, as the drawing illustrates. The incident water stream has a velocity of + 17.4 m/s, while the exiting water stream has a velocity of – 15.0 m/s. The mass of water per second that strikes the blade is 33.6 ...
*January 30, 2014*

**Health**

The coach noticed that Caleb really started to kick the soccer ball with great amount of power after the kicking drills. Caleb adjusted the power of his soccer kick by increasing the speed of his kicking leg prior to and upon contact with the ball starting his kick from a two ...
*January 30, 2014*

**Physics**

A baggage carousel at an airport is rotating with an angular speed of 0.397 rad/s when the baggage begins to be loaded onto it. The moment of inertia of the carousel is 2440 kg·m2. Ten pieces of baggage with an average mass of 16.5 kg each are dropped vertically onto ...
*January 27, 2014*

**science**

if 4 cars were going 100m the entire time what happens to speed,velocity and accelerationas one car completes one full lap
*January 23, 2014*

**science**

What is the acceleration of a 7kg rocjet if a force of 68.6 kg m/s/s (N) is used to move it away from the earth
*January 21, 2014*

**science**

NOT RIGHT!!! 2 is C
*January 21, 2014*

**American History **

What three rivers did Lewis and Clark use to get to the Pacific Coast?
*January 13, 2014*

**Atomic Model/Science**

I dislike Chemistry :O Anyway I do know this: For an atom, the number of natural occurring protons should have the same number of electrons. So your atom should have 92 electrons given if it's not an (ion or man made isotope).
*January 11, 2014*

**Science**

Let: Star = Sun Planets = Earth It's much simpler to understand the question with what we know. Now to answer your question: The gravity of the Sun keeps the earth in it's orbit. This is also true as the Moon orbits the Earth because of the pull of Earth's gravity...
*January 11, 2014*

**Honor's English**

Thank you :-).
*January 11, 2014*

**Honor's English**

Which of the following describes the underlined phrase in the sentence below? The local softball team won the championship (against all odds). A) prepositional B) participial C) gerund D) infinitive Process of elimination: It cannot be C since a gerund needs to have -ing at ...
*January 11, 2014*

**HEALTH**

I got B. 6
*January 10, 2014*

**alegbra **

Suppose that an insurance agent offers you a policy that will provide you with a yearly income of $50,000 in 30 years. What is the comparable salary today, assuming an inflation rate of 3% compounded annually? My answer is $20,559.34, however, the module says its incorrect.
*December 11, 2013*

**Math**

Sam starts from point A at 8:00am and hikes up a mountain path. He arrives at the top, (point B) at 4:00pm. He camps there for the night and the following morning he starts his descent at 9:00am. He travels faster since he goes downhill and arrives at the bottom (point A) at 3...
*December 2, 2013*

**Math**

If the measurement from the outer edge of the first board to the outer edge of the last board is 144 inches, then there would be 14 spaces between the boards, each measuring 3/8 inch. (14x3/8)+(15x9 1/4)= 144. Now if this section is in the middle of the boardwalk, there would ...
*December 2, 2013*

**math**

(15x1000)/60=250
*December 2, 2013*

**science**

For BOD5 test 1) Why water samples needed dilution? 2)How to check the test accuracy? 3)Under what conditions, the water sample needs "seed"? anyone can help?please.
*December 1, 2013*

**science**

How to eliminate chloride interference up to the COD test?
*December 1, 2013*

**Statistics**

I have two coins: a quarter and a nickel. The quarter has a bias of 1/4 for heads, and the nickel has a bias of 2/3 for heads. I flip each coin 10 times. What is the probability that I observe exactly five heads total? Some explanation of the solution would be appreciated.
*November 29, 2013*

**Physics**

i caught you
*November 28, 2013*

**algebra**

Suppose that an insurance agent offers you a policy that will provide you with a yearly income of $50,000 in 30 years. What is the comparable salary today, assuming an inflation rate of 3% compounded annually?
*November 16, 2013*

**High School Geometry**

I am have a hard time understanding how A and B can be No, but C can be Yes on this problem i.imgur (dot)com/rpJQDf3.png I thought that since AD is not perpendicular to the plane m then no lines shooting off of D onto the plane could be perpendicular.
*November 13, 2013*

**math**

Oh thanks Ms.Sue! :)
*November 7, 2013*

**math**

If a car traveled 168 miles in 3.5 hours, what was the average rate of speed?
*November 7, 2013*

**math**

Thanks Ms.Sue.... you're awesome!
*November 7, 2013*

**Physics**

A 3.00-g bullet (c = 0.0305 cal/g . C° = 128 J / kg . C°) moving at 180 m/s enters a bag of sand and stops. By what amount does the temperature of the bullet change if 80% its KE becomes thermal energy that is transferred to the bullet? Thank ´s fir your help!
*November 3, 2013*

**Statistics**

your medical terminology instructor listed the following grades for the class out of a 75 point test: 33,34,43,45,45,54,55,59,60,62,64,66,67,68,67,68,68,69,70,70 a.find the 90th percentile b. your score was 59, what is your percentile?
*November 3, 2013*

**Statistics**

Dear Lee, Please confirm these answers to this question. your medical terminology instructor listed the following grades for the class out of a 75 point test: 33,34,43,45,45,54,55,59,60,62,64,66,67,68,67,68,68,69,70,70 a.find the 90th percentile b. your score was 59, what is ...
*November 3, 2013*

**Statistics**

a. 69 b. 40th percentile
*November 3, 2013*

**Statistics**

your medical terminology instructor listed the following grades for the class out of a 75 point test:<br /> 33,34,43,45,45,54,55,59,60,62,64,66,67,68,67,68,68,69,70,70<br /> a.find the 90th percentile<br /> b. your score was 59, what is your percentile?<...
*November 3, 2013*

**chemistry**

5.34g of salt of formula M2SO4 (M is a metal)were dissolved in water. The sulfate ion was precipitated by adding excess barium chloride solution when 4.66g of barium sulfate (BaSO4) were obtained. a)How many moles of sulfate ion were precipitated as barium sulfate? b)How many ...
*October 19, 2013*

**Chemistry**

What is the purpose of adding 100 mL of distilled water to a beaker containing metal nitrate solution?
*October 6, 2013*

**health**

more
*September 12, 2013*

**Physics**

A light-rail commuter train blows its 200 Hz horn as it approaches a crossing. The speed of sound is 336 m/s. a)An observer waiting at the crossing receives a frequency of 205 Hz. What is the speed of the train?
*September 3, 2013*

**Physics**

Three sources of sound are distributed along a line, as shown in the figure. v is the speed of sound. Source A is at rest, and it emits sound waves with a frequency of 480 Hz. Source B is traveling at v/5 to the right, and it emits sound waves with a frequency of 960 Hz. ...
*September 3, 2013*

**Physics**

A light-rail commuter train blows its 200 Hz horn as it approaches a crossing. The speed of sound is 336 m/s. a)An observer waiting at the crossing receives a frequency of 205 Hz. What is the speed of the train?
*September 3, 2013*

**maths simultaneous equations**

3x + 5y = 1 4x + 7y = 2
*June 18, 2013*

**Chemistry**

Determine the theoretical and percent yield of hydrogen gas if 80.5 g water undergoes electrolysis to produce hydrogen and oxygen and 2.81 g hydrogen is collected. theoretical yield
*June 16, 2013*

**Math**

Value of $100.00 earning 8% compounding interest rate annually at the end of 10 years.
*June 12, 2013*

**math**

what percent of 30 is 40?
*May 22, 2013*

**physics**

Marks: 1 A car merges onto the highway from rest in 10 seconds. The final speed of the car is 60 mph. Estimate the acceleration of the car.
*May 18, 2013*

**Physics**

An trapdoor is 0.91 m square, has a mass of 11 kg, and is hinged along one side with a latch on the opposite side. If the center of mass is located 0.1 m toward the hinged side from the center, what are the magnitudes of the forces on the latch and the hinge from the door?
*April 28, 2013*

**Chemistry **

What is the pH of a solution that is 0.0100 M in HCN and 0.0200 M in NaCN?
*April 23, 2013*

**Math**

If Ethan ate 4 times as many cookies as Daniel who at 2 times as many as Courtney how many cookies did Ethan eat if Courtney ate 2.
*April 21, 2013*

**health**

I got B. 6
*April 18, 2013*

**HEALTH**

Oops, that A was supposed to be D
*April 17, 2013*

**english**

I really need 6 thick (hard) questions for Act 4 scene 1-3 "King Lear" by Shakespeare PLEASE THANK YOU
*April 13, 2013*

**LA**

just tell me please
*April 11, 2013*

**LA**

d?
*April 11, 2013*

**LA**

is it A?
*April 11, 2013*

**LA**

can you help witch one is it?
*April 11, 2013*

**LA**

Which description best captures Abraham Lincoln's approach to slavery before he signed the Emancipation Proclamation? A;Lincoln was himself pro-slavery, but thought that states should have the right to choose whether or not slavery was legal. B;Lincoln was indifferent on ...
*April 11, 2013*

**LA**

thanks
*April 10, 2013*

**LA**

is it A please tell me
*April 10, 2013*

**LA**

i think its A or D
*April 10, 2013*

**LA**

10. How did the 1860 election contribute to the breakup of the Union? A;by electing a president many believed would not protect Southern rights B;by electing a pro-slavery president whom the North would not tolerate C;by allowing freed slaves to vote D;by electing a president ...
*April 10, 2013*

**physical science**

The orbital velocity of an earth satellite in an orbit 400 mi above the earth?
*April 8, 2013*

**Chem**

What will be the temperature of a 3.5 gram sample of carbon dioxide gas in a 2.5 liter container at .955 atm
*April 1, 2013*

**Physics**

Two objects with masses 4.90 and 2.10 hang 0.800 above the floor from the ends of a cord 7.20 long passing over a frictionless pulley. Both objects start from rest. Find the maximum height reached by the 2.10 object. The heavier object will move .8 m down, the lighter will ...
*April 1, 2013*

**Physics**

A parachutist relies on air resistance (mainly on her parachute) to decrease her downward velocity. She and her parachute have a mass of 55.5kg and air resistance exerts a total upward force of 620N on her and her parachute. What is the combined weight of the parachutist and ...
*April 1, 2013*

**physics**

but how do you find the initial height?
*March 31, 2013*

**physics**

Two objects with masses 4.90 and 2.10 hang 0.800 above the floor from the ends of a cord 7.20 long passing over a frictionless pulley. Both objects start from rest. Find the maximum height reached by the 2.10 object.
*March 31, 2013*

**chemistry**

What is the percent by volume (% v/v) of a solution made by mixing 12 ml of ethanol (C2H5OH) with 48 ml of water? b) Assuming the density of ethanol is 0.789g/ml, what is the molarity of this solution?
*March 19, 2013*

**trig**

cos è = 0.9659 A = ? H = 20
*March 13, 2013*

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